Personalized monitoring of female hormones (for example, oestradiol) is of great interest in fertility and women’s health. However, existing approaches usually require invasive blood draws and/or bulky analytical laboratory equipment, making them hard to implement at home. Here we report a skin-interfaced wearable aptamer nanobiosensor based on target-induced strand displacement for automatic and non-invasive monitoring of oestradiol via in situ sweat analysis. The reagentless, amplification-free and ‘signal-on’ detection approach coupled with a gold nanoparticle-MXene-based detection electrode offers extraordinary sensitivity with an ultra-low limit of detection of 0.14 pM. This fully integrated system is capable of autonomous sweat induction at rest via iontophoresis, precise microfluidic sweat sampling controlled via capillary bursting valves, real-time oestradiol analysis and calibration with simultaneously collected multivariate information (that is, temperature, pH and ionic strength), as well as signal processing and wireless communication with a user interface (for example, smartphone). We validated the technology in human participants. Our data indicate a cyclical fluctuation in sweat oestradiol during menstrual cycles, and a high correlation between sweat and blood oestradiol was identified. Our study opens up the potential for wearable sensors for non-invasive, personalized reproductive hormone monitoring.
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This project was supported by the National Institutes of Health grant nos. R01HL155815 and R21DK13266, National Science Foundation grant no. 2145802, Office of Naval Research grant nos. N00014-21-1-2483 and N00014-21-1-2845, American Cancer Society Research Scholar grant no. RSG-21-181-01-CTPS and a Sloan Research Fellowship. We gratefully acknowledge critical support and infrastructure provided for this work by the Kavli Nanoscience Institute at Caltech.
The authors declare no competing interests.
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Supplementary methods, discussion, figures, tables, references and video captions.
Numerical simulation of the electric field enhanced oestradiol sensing.
Microfluidic sweat sampling using a finger-worn wearable sensor patch.
Real-time wireless oestradiol monitoring.
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Ye, C., Wang, M., Min, J. et al. A wearable aptamer nanobiosensor for non-invasive female hormone monitoring. Nat. Nanotechnol. (2023). https://doi.org/10.1038/s41565-023-01513-0
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