Abstract
CHROMATOGRAPHY on filter paper has provided an excellent and a much-needed method for the investigation of the structure of polysaccharides1–5 and proteins6–10. While butanol–ethanol–water, butanol–acetic acid–water, and phenol–water are effective mixtures, among others1, for the separation of a wide variety of sugars11,12,5 and their methyl derivatives13, the phenol–water mixture is usually better than either of the other two mentioned above for the separation of unmethylated sugars (cf. ref. 14). The method using phenol–water, however, suffers from the disadvantage that the location of the sugars on the paper by treatment with ammoniacal silver nitrate cannot be accomplished without some difficulty because the paper quickly becomes dark or sometimes black. It is claimed that suitable purification of the phenol either reduces the darkening5 or eliminates it altogether15. We find that most of the darkening can be avoided by extracting the paper with ether before spraying with the silver reagent. By adopting this slight modification, it has been found unnecessary to purify the phenol.
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BOGGS, L., CUENDET, L., EHRENTHAL, I. et al. Separation and Identification of Sugars using Paper Chromatography. Nature 166, 520–521 (1950). https://doi.org/10.1038/166520b0
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DOI: https://doi.org/10.1038/166520b0
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