Abstract
The aqueous solution of paeonoside and paeonolide, the two new glycosides from peony bark, was found to undergo hydrolysis by irradiation of ultraviolet rays and that this phenomenon was general in phenolic glycosides. Action of ultraviolet rays on phenolic glycosides was found to be as follows.1) Ultraviolet absorption spectra of phenolic and acetylphenolic glycosides were similar to those of their aglycones, with the absorption maxima weaker than those of the aglycones. In a pair of α- and β-glycosides, α-type had absorption maxima of stronger intensity than the β-type.2) Hydrolysis was affected by the wave length of ultraviolet rays, the shorter the wave length, the stronger was the hydrolytic action.3) Aqueous solution of lower pH was more liable to be hydrolyzed by ultraviolet rays.4) Aqueous solution of glycosides in 0.6% concentration was hydrolyzed to 30-90% during 24 hours.5) In a pair of α- and β-glycosides, α-type was generally more easily hydrolyzed than the β-type. Glycosides with reactive side chain in the aglycone portion were also more easily hydrolyzed.
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