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The Chemistry of Plant Life by Thatcher

The anthoxanthin pigments are yellow


The

anthoxanthin pigments are yellow, crystalline solids, which are only slightly soluble in water. They dissolve readily in dilute acids and alkalies, giving yellow or red solutions which are of the same color in either acid or alkaline media. They are extensively used as yellow dyes.

Many of the common members of this group have been mentioned in the chapter dealing with the glucosides. The characteristic pigment nucleus of several of these is as follows:

_Chrysin_, found in various species of poplar and mallows,

O _____ HO / / __/ | | | _____/ | | | / / HO C | O

_Apigenin_, found in parsley and celery, as the glucoside apiin,

O _____ HO / / __/ OH | | | _____/ | | | / / HO C | O

_Campferol_, found in Java indigo, as the glucoside campferitrin,

style="text-align: justify;"> O _____ HO / / __/ OH | | | _____/ | | |OH / / HO C | O

_Fisetin_, found in quebracho wood and fiset wood,

O ____OH HO / / __/ OH | | | _____/ | | | / / C | O

_Quercitrin_, found in oak bark, horse-chestnut flowers, and in the skin of onions,

O ____OH HO / / __/ OH | | | _____/ | | |OH / / HO C | O

_Morin_, found in yellow wood (_Morus tinctoria_).

O HO____ HO / / __/ OH | | | _____/ | | |OH / / HO C | O

_Gentisin_, found in yellow gentian (_Gentiana lutea_),

O CH_{3}O / / / | | | | | | | | / / / OH HO C | O

As a rule, the most brilliant of these yellow pigments are found in the largest quantities in the bark and wood of various species of tropical plants; although they are also present, in smaller amounts, in the blossoms of species growing in temperate zones.


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