Wakeman, Nellie A. (Nellie Antoinette) · Madison : University of Wisconsin · leaf 103
Pigments: CnH2 n— i6 101 tion of the hydroxyl group in the pyrylium cycle, all of the anthocyanin pigments so far known possessing a hydroxyl group in the flavonol position. For example, luteolin and cyanidin are both represented by the formula C15H10O6. The formula for free cyanidin is not known.… … While this difference of position of a hydroxy group may be sufficient to explain the difference in properties of the two groups of pigments in acid combination, something more seems to be required to explain this difference in the acid free form, since many of the flavone pigments as well as the…
Pigments · Plants
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.
