Glycosides ultraviolet absorption

Treatment of cordycepin with nitrous acid, and subsequent hydrolysis of the deaminated product, yields hypoxanthine, indicating that in the adenine moiety the primary amino group is free and the glycosidic linkage involves C7 or C9. The close similarity between the ultraviolet absorption spectrum of cordycepin and those of 9-methyladenine and adenosine63 (9-/3-J>-ribofuranosyladenineMa) favors the latter possibility. The complete stereoisomeric description of cordycepin (XXVIII), formulation of which... 

Hydrolysis at the glycosidic bond occurs also during irradiation of sucrose in aqueous solution, and acid is produced. " Changes in the ultraviolet absorption spectrum have also been noted, and the over-all change in optical rotation accompanying inversion was proposed by Wright for use as a pile-radiation dosimeter. The chemical effects of radiation on sucrose solutions have been investigated by Wolfrom, Binkley, and McCabe ... 

Lucenin-1 has the same ultraviolet absorption spectrum as that of luteolin and orientin, and shows the same diagnostic shifts it gives no sugar under conditions normal for the acid hydrolysis of glycosides, and... 

Most phenolic glycosides are water soluble, but the corresponding aglycones are usually less so. Phenolic substances are aromatic and therefore show intense absorption in the UV region of the spectrum (2). Most of the benzoic acid derivatives displayed their maxima at 246-262 nm, with a shoulder at 290 - 315 nm, except gallic and syringic acid, which have absorption maxima at 271 and 275 nm, respectively (4). The cinnamic acids absorb in two regions in the ultraviolet, one... 

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