Abstract
Nanotechnology is one of the most impressive sciences in the twenty-first century. Not surprisingly, nanoparticles/nanomaterials have been widely deployed given their multifunctional attributes and ease of preparation via environmentally friendly, cost-effective, and simple methods. Although there are assorted optimized preparative methods for synthesizing the nanoparticles, the main challenge is to find a comprehensive method that has multifaceted properties. The goal of this study has been to synthesize aminated (nano)particles via the Rosmarinus officinalis leaf extract-mediated copper oxide; this modification leads to the preparation of (nano)particles with promising biological and photocatalytic applications. The synthesized NPs have been fully characterized, and biological activity was evaluated in antibacterial assessment against Bacillus cereus as a model Gram-positive and Pseudomonas aeruginosa as a model Gram-negative bacterium. The bio-synthesized copper oxide (nano)particles were screened by MTT assay by applying the HEK-293 cell line. The aminated (nano)particles have shown lower cytotoxicity (~ 21%), higher (~ 50%) antibacterial activity, and a considerable increase in zeta potential value (~ + 13.4 mV). The prepared (nano)particles also revealed considerable photocatalytic activity compared to other studies wherein the dye degradation process attained 97.4% promising efficiency in only 80 min and just 7% degradation after 80 min under dark conditions. The biosynthesized copper oxide (CuO) (nano)particle’s biomedical investigation underscores an eco-friendly synthesis of (nano)particles, their noticeable stability in the green reaction media, and impressive biological activity.
Similar content being viewed by others
Introduction
Nanoscale metal-based materials has found its equitable place in daily human life, and its impact is quite evident in science and industry1,2,3. Copper oxide nanoparticle is one of the essential materials with various applications in chemical reactions and biochemical processes. Copper oxide and copper-based nanoparticles have shown biological activity (e.g., antibacterial, antioxidant, and anticancer) and accordingly is used in biomedical sector along with environmental applications4,5,6,7. These compounds are utilized in the tissue engineering8, gene therapy9, disease diagnostics10, and target cancer therapy11,12,13.
In nanomedicine, there are numerous advantages in employing plants as natural and renewable resources for the green synthesis of metal nanoparticles. Such an ideal approach for the nanofabrication of CuO brings value and may pave the way for biomedical applications. In such biological processes, the toxicity of utilized reagents for the nanoparticle's synthesis is relatively low, and natural elements are deployed for reducing, capping, and stabilizing the metal’s nanoparticles. Natural materials such as plants and agricultural residues and waste encompassing compounds like quinines, alkaloids, terpenoids, flavonoids, fatty acids, enzymes, amino acids, phenols, and tannins have distinctive roles in the synthesis of nanoparticles. The biological method is environmentally friendly and leads to highly efficient and cost-effective synthesis and has been extensively used in assorted applications such as drug delivery, gene therapy, nanobiotechnology, medicine, biomedical engineering, and pharmacology14,15,16,17,18,19.
Although chemical and physical synthesis methods have been vastly utilized for the preparation of nanoparticles, being non-eco-friendly, and involving hazardous material usage diminishes their acceptance. In this regard, the bioengineered synthesis methods could replace these methods as they exploit plant phytochemicals or microbial enzymes. Among biologically synthesized nanoparticles (graphene oxide, iron oxide, zinc oxide, platin, selenium, gold, silver), CuO nanoparticles have garnered attention because they comprise a co-factor of the plethora of human neuropeptide enzymes, and are involved in immune cell function, anti-oxidant defense, and cell signaling regulation20.
The bioengineering synthesis process can be divided into three main categories (i) using plant and plant extract (phyto route), (ii) utilizing microorganisms like actinomycetes, bacteria, yeasts, and fungi (microbial pathway), and (iii) usage of templates such as diatoms, viruses, and membrane (bio-template route). The pathway utilizing the abundant plant extractives is preferred to other means because of greener attributes and being well dispersed, endowed with a faster pace of synthesis and relatively lower cytotoxicity; the plant extracts can provide electrons that help reduce the copper salt and also serve as stabilizing agents21. Some of the major contributions to the assembly of CuO nanoparticles via a bioengineered pathway are summarized in Table 1.
In the past few decades, various bacterium and viral disease have been treated with metals/metal oxide nanoparticles wherein CuO nanoparticles have displayed considerable antibacterial activities; CuO nanoparticles being highly toxic to the plethora of plant or human bacterial pathogens49 in view of their high chemical and biological reactivity, biocompatibility, high surface area, and small size50. When CuO nanoparticles come in contact with bacterium cells with help of amines and carboxylic groups on cell membrane, an effortless entry inside the cell occurs with the development of several malfunction cytotoxicity51. CuO nanoparticles generate ROS (reactive oxygen species) that can disrupt the membrane and interfere with cell division, metabolism, and DNA replication besides the degradation of ribosomes and mitochondria promoted by CuO nanoparticles-mediated cytotoxicity. The large redox potential of Cu leads to the generation of the Cu ions and these highly toxic ions accumulate the hydroxyl and superoxide radicals (oxidative stress)52. Chtita et al.29 fabricated a CuO nanoparticle utilizing Gloriosa superba leaf extract that revealed good inhibitory against Klebsiella aerogenes (gram-negative bacteria) and Staphylococcus aureus (gram-positive bacteria)53. Sida acuta leaf extracts has been used by Sathiyavimal and colleagues for the fabrication of CuO nanoparticles as they applied these biosynthesized compounds in the cotton fabrics against gram-negative and gram-positive bacterium with promising results22. Green synthesized CuO nanoparticles from the precursor, Cu (CH3COO)2 by Nwaya et al. demonstrated promising growth inhibitory activity against various species of pathogenic bacteria such as Pseudomonas aeruginosa and Bacillus licheniformis29.
One of the new era’s catastrophic problems is water pollution which has been a major concern for society; it has garnered much attention for the purification of wastewater. Unique features of nanomaterials make them perfect candidates for the degradation of water pollutants like dyes as these photocatalysts are efficient, inexpensive, and offer sustainable approach in wastewater treatment. Photocatalysis is based on having a band gap between the valence band (VB) and the conduction band (CB). When the excited electrons travel from VB to CB, electron–hole (e−/H+) pairs are generated and transferred to the surface of the catalyst and react with other materials such as O2 and H2O; In VB and CB, e− and H+ are able to generate hydroxyl radical (·OH) and O2−, respectively which are responsible for the degradation of pollutants54,55,56. For example, Iqbal and coworkers synthesized CuO nanoparticles using an aqueous extract of Rhazya stricta and investigated it in the degradation of methylene blue (MB) wherein CuO NPs caused 83% degradation of MB after 140 min of reaction57. Some of the unique studies are listed in Table 3.
In this study, we have focused on the synthesis and characterization of CuO (nano)particles utilizing the Rosmarinus officinalis leaf extract. Besides, their photocatalytic and biological activity including the cytotoxicity and antibacterial assessment against Bacillus as a Gram-positive and Pseudomonas as a Gram-negative bacterium, was evaluated.
Materials and methods
Reagents, chemicals, and plant source
All reagents and materials have been of analytical grade and purchased from Sigma-Aldrich. The Rosmarinus officinalis was obtained from Kurdistan province in Iran, and all of the National Laws and/or protocols have adhered appropriately. Amir Mohamad Ghadiri collected the plant samples, and obtained the local permissions. A voucher specimen has been deposited in the herbarium of Prof. M. Bagherzadeh’s Lab at the faculty of chemistry of Sharif University of Technology, Tehran, Iran (Deposition N.O: A.M.G.1581ROSMARI). Although, the plant Rosmarinus officinalis has been well studied in the other studies by the GC–MS technique, identifying this plants ingredients need more studies58,59. The authors confirm that all methods were performed in accordance with the relevant guidelines and regulations.
The plant extract preparation
The Rosmarinus officinalis was washed with distilled water and then kept at room temperature to dry20. The powdery form of the dried plant was prepared by grinding, and the fine pulverized powder (10 g) was dispersed in deionized water (100 mL) and placed for 15 min on a heater stirrer at the boiling point of the solvent and then, set at room temperature for cooling. The Whatman filter paper (grade one) used for filtration of the final solution and the prepared extract have been stored for further experiments at a 4 °C46,60,61.
Synthesis of CuO (nano)particles
For the synthesis of copper oxide (nano)particles from the leaves of Rosmarinus officinalis, 40 mL of extract of Rosmarinus officinalis was transferred to the cupric sulfate solution (160 mL, 1 mM), and after a while, the color changed from mild blue to dark one; mixture being agitated at 25 °C for 24 h. The leaf extract played two crucial roles in this study, as a stabilizing agent and a reducing agent wherein the capping of (nano)particles with ketone and aldehyde groups can control the growth, aggregation, and also reduction process; plant extract has a huge impact on the shape, size, and morphology of the ensued (nano)particles. Based on reported data, higher the concentration of the plant extract, the smaller is the size of ensued (nano)particle, which is a consequence of the presence of additional phytoconstituents. The product was characterized by different techniques such as FT-IR, UV–Vis, and PXRD (Fig. 1).
For separation of unreacted materials and byproducts from the reaction mixture and the CuO (nano)particles, the solution was centrifuged for 25 min at 10,000 rpm and then washed with deionized water and ethanol (three times). The copper oxide-dried powder was obtained by freeze-drying. The technique of ultra-centrifugation was utilized to separate (nano)particles based on their size62,63,64.
Chlorination of copper oxide (nano)particles
Chlorine is one of the most promising ligands in coordination chemistry, which facilitates further functionalization. Accordingly, 15 mL of thionyl chloride was added to the filtered-off product (CuO (nano)particles); additionally, to increase the rate of reaction, 2 mL of DMF was added (18 h, yellow solid, argon atmosphere). Then to obtain a dried powder, the solution was kept in the oven for 24 h.
Amination of functionalized copper oxide (nano)particles
Based on the recent studies, the amination process would invariably lead to lower toxicity and increase the zeta potentials. To accomplish this, 50 mg of the chlorinated product of copper oxide (nano)particles were added to 10 mL DMF in 70 °C on stirrer, then 50 mg of 1,4-phenylenediamine was added to the mixture. The final solution was stirred for 24 h at 70 °C.
Characterization of CuO (nano)particles
The JASCO FT-IR-460 spectrometer has been utilized for Fourier transformed infrared spectroscopy (FT-IR) in the field of 400–4000 cm−1. An automated Philips X'Pert X-ray diffractometer obtained powder X-ray diffraction (PXRD) spectra with Cu K radiation (40 kV and 30 mA) for 2θ values over the range of 10–80. The synthesized (nano)particle morphology and elemental analysis (FESEM, EDS, and map) have been observed under an acceleration voltage of 30–250 by a field emission scanning electron microscope (TESCAN MIRA-3). To record the (UV–Vis) spectra at the range of 200–800 nm, the Perkin Elmer Lambda 25 has been utilized. The nanoparticle size was screened by (DLS) analysis and (Horiba SZ100). The fluorescence spectrometer (PerkinElmer, USA) was utilized for recording (PL analysis).
Antibacterial activity
Antibacterial activities of the compounds against Bacillus cereus and Pseudomonas aeruginosa were assessed by the renowned disk diffusion method utilizing Müller Hinton agar and Sabouraud Dextrose Agar (SDA). The inhibition zone on the incubation completion has been recorded, and the average diameter for every compound was recorded at 400 μg mL−1, and the dimethyl sulfoxide (DMSO)-based Stock solutions of compounds were prepared. Standard antibiotics like penicillin, ampicillin, and gentamicin with similar concentrations have been utilized to compare with compound inhibition zone. To minimize the error, each test was carried out several times (at least three times). As the effect of the DMSO at the biological screening should be clarified, blank studies have been accomplished, and no activity was observed in pure DMSO against any bacterial strains65,66.
Photocatalytic activity
The photocatalytic activity of CuO–NH2 (nano)particles was evaluated in an aqueous solution by calculation of methylene blue degradation. For this purpose, the utilized light source was a 250-W mercury lamp to prepare visible light with a wavelength of more than 420 nm. An optical glass (400–800 nm cutoff filter) was used to determine photocatalytic activity. The photocatalytic tests were carried out with a 100 mL photoreactor at STP67. Every analysis was performed using 0.3 g/L of dispersed CuO–NH2 as the photocatalyst in the 10 mg/L methylene blue aqueous solution. The mixture was stirred and exposed under irradiation simultaneously. To calculate the methylene blue concentration, at the regular steps (exact time interval), 4 mL of solution was separated and screened at 600 and 670 nm (absorbance wavelength)68,69.
MTT assay
The cytotoxicity of synthesized (nano)materials has been investigated by applying the HEK-293 cell line. In brief, 100 µL of F12/DMEM was supplemented with ten percent FBS and incubated in a 96-well plate seeded with 105 cell density per well. The fresh media of several diluted prepared (nano)particles replaced the culture media then newly prepared cells were incubated for 5 h. As mentioned above, the media is replaced with fresh media (for 24 h) at the next stage. After four h incubation at STP, the prepared media aspirated and, in this stage, generated MTT formazan has been dissolved in Dimethyl sulfoxide. Every well’s absorbance has been recorded at 570 nm using a microplate reader70,71,72,73.
Leaves collection permission
The Rosmarinus officinalis have been obtained from Kurdistan province in Iran, and all of the National Laws and/or protocols have adhered appropriately. Amir Mohamad Ghadiri collected the plant samples, and obtained local permissions.
Results and discussion
Synthesis and characterization
Considering the FT-IR spectrum (Fig. 2A), the broad bands are revealed at ~ 3380 cm−1 representing the hydroxyl group stretching frequency (hydroxyl groups on the surface of the CuO (nano)particles). The Cu–O bonds stretching vibration indicator has been revealed74,75 on the 686 cm−1. The peak at 2925 cm−1 proved the presence of carboxylic acid O–H stretching, while another one at 1566 cm−1 is for aliphatic nitro compounds. In CuO–Cl spectra, a band at about 870 cm−1 belongs to C–Cl. Also, the peak at 2421 cm−1 (thiol S–H stretch) is not observed in CuO–NH2 spectra, which showed the replacement of amide and thiol on the surface of copper oxide (nano)particles. Additionally, in CuO–NH2 spectra, the bands observed at ~ 2900 cm−1 is accredited to N–H bonding contributed by 1,4-phenylenediamine on CuO (nano)particles. Their stability after photocatalysis process is affirmed by the subsequent FT-IR analysis of CuO–NH2 (nano)particles as depicted in the Fig. 2A which is reliable evidence of (nano)particles stability (Table 2)62,76,77,78,79,80.
The structure of the synthesized CuO has been investigated by means of PXRD (Fig. 2B). The six prominent characteristic diffraction peaks for CuO are around 2θ = 34.5°, 37.6°, 48.7°, 58.8°, 60.8°, and 69.8°, which corresponds to the (002), (111), (202), (202), (113), and (220) crystallographic planes (The prepared copper oxide nanoparticle matched with the previously recorded XRD pattern of CuO registered as (JCPDS card No. 04-0784), the fcc (face-centered cubic)). In CuO–NH2 (nano)particles’ PXRD spectra, there are other peaks around 2θ = 35°, 38°, 49°, 59°, 61°, and 69°. In the PXRD spectra, the impurities impact contributes to broadening the peaks. These diffraction peaks are in reliable agreement with other studies (Table 2)81,82,83,84.
PL spectroscopy has been widely applied to evaluate the rate of recombination of photogenerated electron–hole pairs on irradiated semiconductor nanoparticles85. One of the significant points is that the PL intensity has a direct relation with the electron–hole pair recombination rate. In general, it is well known that as the PL intensity becomes weaker, the recombination rate in semiconductors decreases; as a result, the lifetime of photogenerated charge carriers increases significantly, which causes the better photocatalytic activity of the desired photocatalyst. Figure 2D exhibits the PL spectra of CuO, CuO–Cl, and CuO–NH2 nanoparticles at the maximum excitation wavelengths of these nanoparticles (Fig. 2C). As can be clearly seen in the figure, the PL intensity spectrum of CuO–NH2 NPs is relatively lower than that of CuO–Cl and CuO nanoparticles. Also, the PL intensity spectrum of CuO–Cl nanoparticles is relatively lower than that of pure CuO nanoparticles. These results clearly illustrate that the electron–hole pair recombination can be significantly reduced by modifying the surface of copper oxide nanoparticles with chlorine and amine. The inhibition of electron–hole pair recombination by the surface amine group leads to a more efficient separation of photo-generated charge carriers, which eventually increases the photocatalytic activity of semiconducting NPs. Compared with pure copper oxide NPs and chlorinated copper oxide NPs, aminated copper oxide NPs exhibited a remarkable quenching in the PL intensity emission signal, which indicates that the amination of copper oxide NPs can lead to better separation efficiency of photo-generated charge carriers and consequently enhance the efficiency of photocatalytic activity of semiconducting nanoparticles.
The FESEM analysis has been utilized to evaluate the synthesized (nano)particle’s morphology. The FESEM images of the synthesized CuO (nano)particles mediated by Rosmarinus officinalis leaf are depicted in Fig. 3A1–A3, the aminated CuO (nano)particles being shown in Fig. 3B1–B3. The homogenous size range and monodispersed distribution are the features of these biosynthesized copper oxide (nano)particles. Stabilizing agents as well as reducing agents can change the morphology and the shape of (nano)particles both of them being performed by the plant extract in this case. The ensued data are in agreement with recent descriptions of copper oxide nanoparticles78,79,80,86,87,88. The Fig. 3C1–C3 is related to the CuO–NH2 (nano)particles after photocatalysis activity which illustrates that the surface morphology of prepared (nano)particles did not change considerably relative to the pristine CuO–NH2 surface morphology, which presents compelling evidence of (nano)particle’s stability. The DLS results demonstrate that the amination process can lead to increase of the particle size, and it could be due to increasing the hydrogen bands (Figs. S5–S7).
The elemental analysis (EDS) and elemental mapping are presented in Fig. 4A–X which revealed that all elements are well distributed on the (nano)particles’ surface, their percentage changing in considerable concordance with the synthesis steps. The zeta potential of prepared CuO and CuO–NH2 (nano)particles were − 8.4 and + 5 mV that; this considerable difference, was in good accordance with EDS results (elements’ percentage change) (Figs. S3 and S4).
Antibacterial activity
There are some probable mechanisms for antibacterial activity of metal nanoparticles such as disruption of cell membrane, DNA and protein damage, cell substances oxidation, attachment to ribosome, generation of ROS (reactive oxygen species), prevention of biofilm production, proton efflux damage, penetrating and then connection of metal ion to the cell’s sulfur and phosphorus which leads to apoptosis and connection of metal ion to the thiol group of the cell-surface protein. However, the precise mechanism is unknown, the further biological studies are necessary to broaden the available data. The prepared compounds have been tested for antibacterial activity against Pseudomonas aeruginosa gram negative species and Bacillus cereus as Gram positive. The amination of the CuO (nano)particles leads to ~ 50% increasing in antibacterial activity for example, the aminated CuO (nano)particles inhibition zone on Pseudomonas aeruginosa is about 29 mm while, the inhibition zone of CuO (nano)particles is 20 mm. The solvent and the extract of plant do not show momentous activity, it is proven that these compounds show antibacterial activity in comparison with that detected for standard antibiotic gentamicin, penicillin, and ampicillin. The results are compared with other researches and the collected data is quite considerable (Fig. 5). The ROS generated by CuO NPs can interact with bacteria’s cell membrane for penetrating to the cell and this connection can make some malfunction that inhibit the bacterial growth and leads to cell death. The smaller the size of (nano)particles, easier is the entry without any interference. The abundant functional groups such as amine and carboxyl on the surface of the cell can attract the Cu cations towards the cell. The CuO amination has shown enhancement in antibacterial activity. The metal–ligand linkage inertness presumably enlarges its protection against enzymatic degradation, cell permeability, and lipophilicity89,90,91.
Photocatalytic activity
The photocatalysis has been proposed for abatement the environmental pollutants and nowadays it is playing pivotal role as it is relatively non-toxic, efficient, and inexpensive. Three step essentially comprise the reactions which occur on the surface of photocatalyst: (i) absorption of the light, (ii) disconnection and transfer of photogenerated electrons, (iii) and redox reaction. The main argument about the dye degradation mechanism is that oxygen and superoxide radicals are produced from the reaction of photogenerated electrons and hydroxyl radicals which then degrade the methylene blue (MB) dye. The CuO–NH2 (nano)particles photocatalytic activity have been screened by the degradation of methylene blue. The prepared (nano)particles were transferred to the dye-containing solution, and the mixture was irradiated by the lamp, as mentioned earlier (visible light)67. The UV–Vis spectra (Fig. 6A) revealed that the dye degradation (decrease in maximum absorbance) of MB in the presence of synthesized (nano)particles (CuO–NH2) occurred after 80 min with 97.4% efficiency which is significant result among all CuO-based nanoparticles. Based on the outcome of studies, the time and the yield of degradation process by aminated CuO were found to be the best (Table 3)98.
In this work, before performing the photocatalysis process in presence of light, we screened CuO–NH2 photo degradation efficiency under dark condition (Fig. 6B). Under dark conditions, it caused only ~ 7% degradation after 80 min. On the other hand, in the presence of light, more than 97% degradation is recorded thus clarifying that the light is responsible for the degradation of methylene blue99.
Photodegradation process for methylene blue (MB)
The plausible photocatalytic mechanism for the photodegradation of MB dye by synthesized CuO–NH2 NPs is presented in Fig. 7. Irradiation of visible light to the CuO–NH2 NPs' catalytic surface causes the movement of photoexcited electrons from the VB to the CB and produces electron–hole pairs, as displayed in Eq. (1):
Furthermore, as light-excited electrons are transferred from the VB to the CB, an equal number of holes are created in the VB. The oxidation process for water molecules occurs by the valence band and causes the production of active OH free radicals, as displayed in Eq. (2):
In the conduction band, due to the reduction process of the oxygen molecules, superoxide free radicals are produced, and finally, these produced radicals are converted into hydroxyl free radicals in several consecutive steps, as displayed in Eq. (3)103:
Eventually, the photodegradation of desired dye occurs via the produced active ·OH free radicals, as displayed in Eq. (4):
The photodegradation of MB dye entails several steps up to generate the H2O and CO2 molecules eventually. The photodegradation of organic pollutants is accomplished by powerful oxidants such as ·OH radicals, which are shown in Fig. 7104.
Cytotoxicity
It is obvious that the prepared (nano)material’s cellular safety must be considered in advance of any potential biomedical appliance. The cytotoxicity of copper oxide nanoparticles has been reported in some papers, but the lack of utilization of a green method could increase the cytotoxicity. Based on other studies, the cytotoxicity of Rosmarinus officinalis leaf’s extract was quite low and the cell viability was relatively high. On the contrary, the cytotoxicity of CuO (nano)particles is higher and their cell viability is lower. Based on the zeta potential results, the surface amination has led to considerable increases in surface potential (Figs. S3 and S4)105. It is evident that by making the surface potential more positive, the cytotoxicity of compounds will drastically decrease and The MTT assay results of aminated product clearly has affirmed this claim. The more positive surface, makes the prepared compound a good candidate for drug and gene delivery. So, the proposed method (surface amination) can be utilizable in various nanosystem for biomedical purposes. The cell viability of CuO–NH2 is conspicuously higher (~ 21%) while the cytotoxicity is considerably lower. The prepared (nano)material’s stability and safety has been confirmed by convergent trend results of 24- and 48-h treatment (Fig. 8A,D). Also, the heat map graphs are depicting the interrelationship among (nano)materials various concentration and relative cell viability (Fig. 8B,E). The dose-dependent response of prepared (nano)materials is proved by MTT assay with utilized the (nano)materials at varying concentrations namely 0.1, 0.5, 1, 5, 10, 50 µg/mL; Fig. 8C,F depicts the IC-50 values73,89,106,107.
Conclusion
The present study focuses on the biosynthesis of aminated copper oxide (nano)particles from Rosmarinus officinalis leaf extract for the first time wherein an inclusive study about the potential biological and photocatalytic activity was undertaken. The prepared (nano)particles have been fully characterized and revealed a promising photocatalytic activity on degradation of methylene blue dye (~ 97% degradation under light in 80 min and just ~ 7% in dark condition and 80 min). These biosynthesized (nano)particles displayed potential antibacterial activity as well when screened against Bacillus as a gram-positive and Pseudomonas as a gram-negative bacterium (~ 50% increase in antibacterial activity for CuO–NH2 compared to CuO (nano)particles). The encouraging results are due to the synthesis technique deployed for the metal oxide nanoparticles and, specifically, the first aminated copper oxide (nano)particles with this promising potential. It is quotable that the amination of CuO led to considerable increase (Δζ = + 13.4 mV) in zeta potential of prepared (nano)particles. Additionally, the MTT assay investigation of the biosynthesized aminated copper oxide (nano)particles revealed that the proposed modification method leads to lower cytotoxicity (~ 21%). Owing to the considerable stability of prepared nanoparticles in greener media and based on remarkable results in vitro studies, the impressive ensued biological activity are additional attractive features of this study.
Data availability
All data generated or analyzed during this study are included in this published article.
References
Islamipour, Z. et al. Biodegradable antibacterial and antioxidant nanocomposite films based on dextrin for bioactive food packaging. J. Nanostruct. Chem., 1–16 (2022).
Iravani, S. & Varma, R. S. Plant-derived edible nanoparticles and miRNAs: Emerging frontier for therapeutics and targeted drug-delivery. ACS Sustain. Chem. Eng. 7(9), 8055–8069 (2019).
Hebbalalu, D. et al. Greener techniques for the synthesis of silver nanoparticles using plant extracts, enzymes, bacteria, biodegradable polymers, and microwaves. ACS Sustain. Chem. Eng. 1(7), 703–712 (2013).
Priya, D. D. et al. Fabricating a g-C3N4/CuO heterostructure with improved catalytic activity on the multicomponent synthesis of pyrimidoindazoles. J. Nanostruct. Chem. 10(4), 289–308 (2020).
Makvandi, P. et al. Metal-based nanomaterials in biomedical applications: Antimicrobial activity and cytotoxicity aspects. Adv. Funct. Mater. 30(22), 1910021 (2020).
Rafieyan, S. G. et al. Application of Terminalia catappa wood-based activated carbon modified with CuO nanostructures coupled with H2O2 for the elimination of chemical oxygen demand in the gas refinery. J. Nanostruct. Chem., 1–19 (2021).
Gawande, M. B. et al. Cu and Cu-based nanoparticles: Synthesis and applications in catalysis. Chem. Rev. 116, 3722–3811 (2016).
Ali, A. et al. CuO assisted borate 1393B3 glass scaffold with enhanced mechanical performance and cytocompatibility: An in vitro study. J. Mech. Behav. Biomed. Mater. 114, 104231 (2021).
Chen, Z. et al. Tumor reoxygenation for enhanced combination of radiation therapy and microwave thermal therapy using oxygen generation in situ by CuO nanosuperparticles under microwave irradiation. Theranostics 10(10), 4659 (2020).
Zou, K. et al. CuO–ZnO heterojunction derived from Cu2+-doped ZIF-8: A new photoelectric material for ultrasensitive PEC immunoassay of CA125 with near-zero background noise. Anal. Chim. Acta 1099, 75–84 (2020).
Shaabani, A. et al. Multi-component reaction-functionalized chitosan complexed with copper nanoparticles: An efficient catalyst toward A3 coupling and click reactions in water. Appl. Organomet. Chem. 33(9), e5074 (2019).
Kumari, S., Singh, B. N. & Srivastava, P. Effect of copper nanoparticles on physico-chemical properties of chitosan and gelatin-based scaffold developed for skin tissue engineering application. 3 Biotech 9(3), 1–14 (2019).
Ameh, T. & Sayes, C. M. The potential exposure and hazards of copper nanoparticles: A review. Environ. Toxicol. Pharmacol. 71, 103220 (2019).
Rabiee, N. et al. Multifunctional 3D hierarchical bioactive green carbon-based nanocomposites. ACS Sustain. Chem. Eng. 9(26), 8706–8720 (2021).
Kiani, M. et al. High-gravity-assisted green synthesis of palladium nanoparticles: The flowering of nanomedicine. Nanomed. Nanotechnol. Biol. Med. 30, 102297 (2020).
Kiani, M. et al. Improved green biosynthesis of chitosan decorated Ag-and Co3O4-nanoparticles: A relationship between surface morphology, photocatalytic and biomedical applications. Nanomed. Nanotechnol. Biol. Med. 32, 102331 (2021).
Rabiee, N. et al. High-gravity-assisted green synthesis of NiO-NPs anchored on the surface of biodegradable nanobeads with potential biomedical applications. J. Biomed. Nanotechnol. 16(4), 520–530 (2020).
Rabiee, N. et al. Turning toxic nanomaterials into a safe and bioactive nanocarrier for co-delivery of DOX/pCRISPR. ACS Appl. Bio Mater. 4(6), 5336–5351 (2021).
Rabiee, N. et al. Calcium-based nanomaterials and their interrelation with chitosan: Optimization for pCRISPR delivery. J. Nanostruct. Chem., 1–14 (2021).
Abdallah, Y. et al. The green synthesis of MgO nano-flowers using Rosmarinus officinalis L. (Rosemary) and the antibacterial activities against Xanthomonas oryzae pv. oryzae. BioMed Res. Int. 2019 (2019).
Abdollahiyan, P. et al. An innovative colorimetric platform for the low-cost and selective identification of Cu (II), Fe (III), and Hg (II) using GQDs-DPA supported amino acids by microfluidic paper-based (µPADs) device: Multicolor plasmonic patterns. J. Environ. Chem. Eng. 9(5), 106197 (2021).
Sathiyavimal, S. et al. Biogenesis of copper oxide nanoparticles (CuONPs) using Sida acuta and their incorporation over cotton fabrics to prevent the pathogenicity of Gram negative and Gram positive bacteria. J. Photochem. Photobiol. B 188, 126–134 (2018).
Sarkar, J. et al. Green synthesized copper oxide nanoparticles ameliorate defence and antioxidant enzymes in Lens culinaris. Nanomaterials 10(2), 312 (2020).
Waris, A. et al. A comprehensive review of green synthesis of copper oxide nanoparticles and their diverse biomedical applications. Inorg. Chem. Commun. 123, 108369 (2021).
Praburaman, L. et al. Piper betle-mediated synthesis, characterization, antibacterial and rat splenocyte cytotoxic effects of copper oxide nanoparticles. Artif. Cells Nanomed. Biotechnol. 44(6), 1400–1405 (2016).
Mali, S., Raj, S. & Trivedi, R. Biosynthesis of copper oxide nanoparticles using Enicostemma axillare (Lam.) leaf extract. Biochem. Biophys. Rep. 20, 100699 (2019).
Berra, D. et al. Green synthesis of copper oxide nanoparticles by Pheonix dactylifera L. leaves extract. Dig. J. Nanomater. Biostruct. 13(4), 1231–1238 (2018).
Gunalan, S., Sivaraj, R. & Venckatesh, R. Aloe barbadensis Miller mediated green synthesis of mono-disperse copper oxide nanoparticles: Optical properties. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 97, 1140–1144 (2012).
Nwanya, A. C. et al. Industrial textile effluent treatment and antibacterial effectiveness of Zea mays L. dry husk mediated bio-synthesized copper oxide nanoparticles. J. Hazard. Mater. 375, 281–289 (2019).
Gultekin, D. D. et al. Biosynthesis and characterization of copper oxide nanoparticles using Cimin grape (Vitis vinifera cv.) extract. Int. J. Second. Metab. 4, Special Issue 1(3), 77–84 (2017).
Wang, G. et al. Green synthesis of copper nanoparticles using green coffee bean and their applications for efficient reduction of organic dyes. J. Environ. Chem. Eng. 9(4), 105331 (2021).
Rafique, M. et al. A review on synthesis, characterization and applications of copper nanoparticles using green method. NANO 12(04), 1750043 (2017).
Subhankari, I. & Nayak, P. Antimicrobial activity of copper nanoparticles synthesised by ginger (Zingiber officinale) extract. World J. Nano Sci. Technol. 2(1), 10–13 (2013).
Sirisha, N. G. D. & Asthana, S. Microwave mediated green synthesis of copper nanoparticles using aqueous extract of Piper nigrum seeds and particles characterisation. IAETSD J. Adv. Res. Appl. Sci. 5(2), 859–870 (2018).
Chakraborty, N. et al. Green synthesis of copper/copper oxide nanoparticles and their applications: A review. Green Chem. Lett. Rev. 15(1), 187–215 (2022).
Vaidehi, D. et al. Antibacterial and photocatalytic activity of copper oxide nanoparticles synthesized using Solanum lycopersicum leaf extract. Mater. Res. Express 5(8), 085403 (2018).
Shende, S. et al. Green synthesis of copper nanoparticles by Citrus medica Linn. (Idilimbu) juice and its antimicrobial activity. World J. Microbiol. Biotechnol. 31(6), 865–873 (2015).
Thakur, S. et al. Green synthesis of copper nano-particles using Asparagus adscendens roxb. root and leaf extract and their antimicrobial activities. Int. J. Curr. Microbiol. Appl. Sci 7(4), 683–694 (2018).
Hafeez, M. et al. Populus ciliata leaves extract mediated synthesis of zinc oxide nanoparticles and investigation of their anti-bacterial activities. Mater. Res. Express 6(7), 075064 (2019).
Narasaiah, P., Mandal, B. K. & Sarada, N. Biosynthesis of copper oxide nanoparticles from Drypetes sepiaria leaf extract and their catalytic activity to dye degradation. In IOP Conference Series: Materials Science and Engineering (IOP Publishing, 2017).
Ijaz, F. et al. Green synthesis of copper oxide nanoparticles using Abutilon indicum leaf extract: Antimicrobial, antioxidant and photocatalytic dye degradation activities. Trop. J. Pharm. Res. 16(4), 743–753 (2017).
Prasad, K. S. et al. Aqueous extract of Saraca indica leaves in the synthesis of copper oxide nanoparticles: Finding a way towards going green. J. Nanotechnol. 2017 (2017).
Nasrollahzadeh, M. & Sajadi, S. M. Green synthesis of copper nanoparticles using Ginkgo biloba L. leaf extract and their catalytic activity for the Huisgen [3+2] cycloaddition of azides and alkynes at room temperature. J. Colloid Interface Sci. 457, 141–147 (2015).
Aher, Y. B. et al. Biosynthesis of copper oxide nanoparticles using leaves extract of Leucaena leucocephala L. and their promising upshot against diverse pathogens. Int. J. Mol. Clin. Microbiol. 7(1), 776–786 (2017).
Ramesh, C., HariPrasad, M. & Ragunathan, V. Effect of Arachis hypogaea L. leaf extract on Barfoed’s solution; Green synthesis of Cu2O nanoparticles and its antibacterial effect. Curr. Nanosci. 7(6), 995–999 (2011).
Naika, H. R. et al. Green synthesis of CuO nanoparticles using Gloriosa superba L. extract and their antibacterial activity. J. Taibah Univ. Sci. 9(1), 7–12 (2015).
Chung, I. M. et al. Green synthesis of copper nanoparticles using Eclipta prostrata leaves extract and their antioxidant and cytotoxic activities. Exp. Ther. Med. 14(1), 18–24 (2017).
Javad, K. & Mohsenzadeh, M. Rapid, green and eco-friendly biosynthesis of copper nanoparticles using flower extract of aloe vera, synthesis and reactivity in inorganic. Met. Organ. Nano-Met. Chem. (2014).
Applerot, G. et al. Understanding the antibacterial mechanism of CuO nanoparticles: Revealing the route of induced oxidative stress. Small 8(21), 3326–3337 (2012).
Awwad, A., Albiss, B. & Salem, N. Antibacterial activity of synthesized copper oxide nanoparticles using Malva sylvestris leaf extract. SMU Med. J. 2(1), 91–101 (2015).
Akintelu, S. A. et al. Green synthesis of copper oxide nanoparticles for biomedical application and environmental remediation. Heliyon 6(7), e04508 (2020).
Camacho-Flores, B. et al. Copper: Synthesis techniques in nanoscale and powerful application as an antimicrobial agent. J. Nanomater. 2015 (2015).
Chtita, S. et al. Quantitative structure–activity relationship studies of dibenzo [a, d] cycloalkenimine derivatives for non-competitive antagonists of N-methyl-d-aspartate based on density functional theory with electronic and topological descriptors. J. Taibah Univ. Sci. 9(2), 143–154 (2015).
Fonseca-Cervantes, O. R. et al. Effects in band gap for photocatalysis in TiO2 support by adding gold and ruthenium. Processes 8(9), 1032 (2020).
Bagherzadeh, M. & Kaveh, R. A new SnS2-BiFeO3/reduced graphene oxide photocatalyst with superior photocatalytic capability under visible light irradiation. J. Photochem. Photobiol. A 359, 11–22 (2018).
Prakash, K. et al. Controllable synthesis of SnO2 photocatalyst with superior photocatalytic activity for the degradation of methylene blue dye solution. J. Exp. Nanosci. 11(14), 1138–1155 (2016).
Bibi, H. et al. Green synthesis of multifunctional carbon coated copper oxide nanosheets and their photocatalytic and antibacterial activities. Sci. Rep. 11(1), 1–11 (2021).
Tomi, K. et al. Enantioselective GC–MS analysis of volatile components from rosemary (Rosmarinus officinalis L.) essential oils and hydrosols. Biosci. Biotechnol. Biochem. 80(5), 840–847 (2016).
Garzoli, S. et al. Headspace/GC–MS analysis and investigation of antibacterial, antioxidant and cytotoxic activity of essential oils and hydrolates from Rosmarinus officinalis L. and Lavandula angustifolia Miller. Foods 10(8), 1768 (2021).
Ghadiri, A. M. et al. Green synthesis of CuO-and Cu2O-NPs in assistance with high-gravity: The flowering of nanobiotechnology. Nanotechnology 31(42), 425101 (2020).
Ehsani, A. et al. Facile and green synthesis of CuO nanoparticles and electrocatalytic activity of CuO nanoparticles/conductive polymer composite film. Iran. J. Catal. 6(3-Special issue), 269–274 (2016).
Zarrabi, A. & Ghasemi-Fasaei, R. Preparation of green synthesized copper oxide nanoparticles for efficient removal of lead from wastewaters (2021).
Ram, A. J. et al. Green synthesis of copper oxide nanoparticles using tamarind extract and its alpha amylase inhibitory activity. Plant Cell Biotechnol. Mol. Biol., 121–126 (2020).
Lakshmanan, S. et al. Role of green synthesized CuO nanoparticles of Trigonella foenum-graecum L. leaves and their impact on structural, optical and antimicrobial activity. Int. J. Nanosci. Nanotechnol. 17(2), 107–119 (2021).
Rancan, F. et al. Influence of substitutions on asymmetric dihydroxychlorins with regard to intracellular uptake, subcellular localization and photosensitization of Jurkat cells. J. Photochem. Photobiol. B 78(1), 17–28 (2005).
Samu, G. F. et al. Photocatalytic, photoelectrochemical, and antibacterial activity of benign-by-design mechanochemically synthesized metal oxide nanomaterials. Catal. Today 284, 3–10 (2017).
Umadevi, M. & Christy, A. J. Synthesis, characterization and photocatalytic activity of CuO nanoflowers. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 109, 133–137 (2013).
Scuderi, V. et al. Photocatalytic activity of CuO and Cu2O nanowires. Mater. Sci. Semicond. Process. 42, 89–93 (2016).
Jiang, D. et al. Photocatalytic performance enhancement of CuO/Cu2O heterostructures for photodegradation of organic dyes: Effects of CuO morphology. Appl. Catal. B 211, 199–204 (2017).
Devi, A. B. et al. Novel synthesis and characterization of CuO nanomaterials: Biological applications. Chin. Chem. Lett. 25(12), 1615–1619 (2014).
Esmaeili Govarchin Ghaleh, H. et al. Using CuO nanoparticles and hyperthermia in radiotherapy of MCF-7 cell line: Synergistic effect in cancer therapy. Artif. Cells Nanomed. Biotechnol. 47(1), 1396–1403 (2019).
Rabiee, N. et al. Aptamer hybrid nanocomplexes as targeting components for antibiotic/gene delivery systems and diagnostics: A review. Int. J. Nanomed. 15, 4237 (2020).
Rabiee, N. et al. Porphyrin molecules decorated on metal–organic frameworks for multi-functional biomedical applications. Biomolecules 11(11), 1714 (2021).
Bala, N. et al. Phenolic compound-mediated single-step fabrication of copper oxide nanoparticles for elucidating their influence on anti-bacterial and catalytic activity. New J. Chem. 41(11), 4458–4467 (2017).
Mallakpour, S., Azadi, E. & Hussain, C. M. Environmentally benign production of cupric oxide nanoparticles and various utilizations of their polymeric hybrids in different technologies. Coord. Chem. Rev. 419, 213378 (2020).
Alnaddaf, L. M. et al. Green synthesis of nanoparticles using different plant extracts and their characterizations. In Nanobiotechnology 165–199 (Springer, 2021).
Velsankar, K. et al. Green synthesis of CuO nanoparticles via Allium sativum extract and its characterizations on antimicrobial, antioxidant, antilarvicidal activities. J. Environ. Chem. Eng. 8(5), 104123 (2020).
Benhammada, A. & Trache, D. Green synthesis of CuO nanoparticles using Malva sylvestris leaf extract with different copper precursors and their effect on nitrocellulose thermal behavior. J. Therm. Anal. Calorim., 1–16 (2021).
Venkatramanan, A. et al. Green synthesis of copper oxide nanoparticles (CuO NPs) from aqueous extract of seeds of Elettaria cardamomum and its antimicrobial activity against pathogens. Curr. Biotechnol. 9(4), 304–311 (2020).
Taghavimandi, F., Norouzbeigi, R. & Velayi, E. Single-step fabrication of superhydrophobic urchin-like copper oxide nanopowders: Effect of structure-directing agents. Ceram. Int. 47(7), 9522–9533 (2021).
Amin, F. et al. Green synthesis of copper oxide nanoparticles using Aerva javanica leaf extract and their characterization and investigation of in vitro antimicrobial potential and cytotoxic activities. Evid. Based Complem. Altern. Med. 2021 (2021).
Rabiee, N. et al. Biosynthesis of copper oxide nanoparticles with potential biomedical applications. Int. J. Nanomed. 15, 3983 (2020).
Reddy, K. R. Green synthesis, morphological and optical studies of CuO nanoparticles. J. Mol. Struct. 1150, 553–557 (2017).
Pansambal, S. et al. Green synthesis of CuO nanoparticles using Ziziphus mauritiana L. extract and its characterizations. Int. J. Sci. Res. Sci. Technol. 3, 1388–1392 (2017).
Guo, Y. et al. Micro/nano-structured CaWO4/Bi2WO6 composite: Synthesis, characterization and photocatalytic properties for degradation of organic contaminants. Dalton Trans. 41(41), 12697–12703 (2012).
Cuong, H. N. et al. New frontiers in the plant extract mediated biosynthesis of copper oxide (CuO) nanoparticles and their potential applications: A review. Environ. Res. 203, 111858 (2022).
Anjali Krishna, B. & Prema, P. Green synthesis of copper oxide nanoparticles using Cinnamomum malabatrum leaf extract and its antibacterial activity. Indian J. Chem. Technol. (IJCT) 27(6), 525–530 (2021).
Rabiee, N., Safarkhani, M. & Rabiee, M. Rapid electrochemical ultra-sensitive evaluation and determination of daptomycin based on continuous cyclic voltammetry. Curr. Pharm. Anal. 16(2), 181–185 (2020).
Alishah, H. et al. Green synthesis of starch-mediated CuO nanoparticles: Preparation, characterization, antimicrobial activities and in vitro MTT assay against MCF-7 cell line. Rendiconti Lincei 28(1), 65–71 (2017).
Nabila, M. I. & Kannabiran, K. Biosynthesis, characterization and antibacterial activity of copper oxide nanoparticles (CuO NPs) from actinomycetes. Biocatal. Agric. Biotechnol. 15, 56–62 (2018).
Patra, J. K. & Baek, K.-H. Novel green synthesis of gold nanoparticles using Citrullus lanatus rind and investigation of proteasome inhibitory activity, antibacterial, and antioxidant potential. Int. J. Nanomed. 10, 7253 (2015).
Ahmed, J. Y. & Alrubaye, R. T. A. Gas adsorption and storage at metal-organic frameworks. J. Eng. 28(1), 65–75 (2022).
Ahmad, R. et al. Engineered hierarchical CuO nanoleaves based electrochemical nonenzymatic biosensor for glucose detection. J. Electrochem. Soc. 168(1), 017501 (2021).
Aryal, M. et al. Ultrasound-mediated blood–brain barrier disruption for targeted drug delivery in the central nervous system. Adv. Drug Deliv. Rev. 72, 94–109 (2014).
Van de Ven, S. et al. Discordances in ER, PR and HER2 receptors after neoadjuvant chemotherapy in breast cancer. Cancer Treat. Rev. 37(6), 422–430 (2011).
Ajorlou, E., Khosroushahi, A. Y. & Yeganeh, H. Novel water-borne polyurethane nanomicelles for cancer chemotherapy: Higher efficiency of folate receptors than TRAIL receptors in a cancerous Balb/C mouse model. Pharm. Res. 33(6), 1426–1439 (2016).
Alvarez-Lorenzo, C. & Concheiro, A. Smart drug delivery systems: From fundamentals to the clinic. Chem. Commun. 50(58), 7743–7765 (2014).
Yu, J., Hai, Y. & Jaroniec, M. Photocatalytic hydrogen production over CuO-modified titania. J. Colloid Interface Sci. 357(1), 223–228 (2011).
Singh, J. et al. Environmental Research. 177, ID Patent 108,569 (2019).
Abid, J.-P. et al. Preparation of silver nanoparticles in solution from a silver salt by laser irradiation. Chem. Commun. 7, 792–793 (2002).
Abdollahiyan, P. et al. Providing multicolor plasmonic patterns with graphene quantum dots functionalized d-penicillamine for visual recognition of V (V), Cu (II), and Fe (III): Colorimetric fingerprints of GQDs-DPA for discriminating ions in human urine samples. J. Mol. Recognit. 34(12), e2936 (2021).
Cottu, P. et al. Ribociclib plus letrozole in subgroups of special clinical interest with hormone receptor–positive, human epidermal growth factor receptor 2-negative advanced breast cancer: Subgroup analysis of the phase IIIb CompLEEment-1 trial. Breast 62, 75–83 (2022).
Houas, A. et al. Photocatalytic degradation pathway of methylene blue in water. Appl. Catal. B 31(2), 145–157 (2001).
Zong, Y. et al. Synthesis and high photocatalytic activity of Eu-doped ZnO nanoparticles. Ceram. Int. 40(7), 10375–10382 (2014).
Bagherzadeh, M. et al. MIL-125-based nanocarrier decorated with Palladium complex for targeted drug delivery. Sci. Rep. 12(1), 1–15 (2022).
Zlabiene, U. et al. In vitro and clinical safety assessment of the multiple W/O/W emulsion based on the active ingredients from Rosmarinus officinalis L., Avena sativa L. and Linum usitatissimum L. Pharmaceutics 13(5), 732 (2021).
Fitsiou, E. & Pappa, A. Anticancer activity of essential oils and other extracts from aromatic plants grown in Greece. Antioxidants 8(8), 290 (2019).
Acknowledgements
Support of this work by the Sharif University of Technology Research Council gratefully acknowledged.
Author information
Authors and Affiliations
Contributions
M.S., N.R., and M.B. conceived the original idea and, with the contributions of A.M.G. and F.T.M. and M.K. developed the study. M.S. performed the experiments with the contribution of A.M.G. and H.D. and P.M. and analyzed the results with the contribution of N.A. The manuscript was written by M.S., N.R., Y.F., and R.S.V. and was finalized with all authors’ assistance. M.B., N.R., and R.S.V. provided advice, expertise, reagents, and materials. All authors read and edited the manuscript.
Corresponding author
Ethics declarations
Competing interests
The authors declare no competing interests.
Additional information
Publisher's note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary Information
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
About this article
Cite this article
Bagherzadeh, M., Safarkhani, M., Ghadiri, A. et al. Bioengineering of CuO porous (nano)particles: role of surface amination in biological, antibacterial, and photocatalytic activity. Sci Rep 12, 15351 (2022). https://doi.org/10.1038/s41598-022-19553-2
Received:
Accepted:
Published:
DOI: https://doi.org/10.1038/s41598-022-19553-2
This article is cited by
-
Biological mechanism of cell oxidative stress and death during short-term exposure to nano CuO
Scientific Reports (2023)
-
Improving antibacterial ability of Ti-Cu thin films with co-sputtering method
Scientific Reports (2023)
-
Biological activities and antioxidant potential of different biosynthesized nanoparticles of Moringa oleifera
Scientific Reports (2022)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.