The polyphenols in leaves of Eucalyptus sideroxylon

Abstract

The leaves of a new physiological form of Eucalyptus sideroxylon were found to contain very much greater amounts of 3 hydroxystilbene glucosides and appreciably lower amounts of a quercetin glycoside than the leaves of the normal farm of this species. The hydroxystilbenes were identified as 3,5,4[image]-trihydroxy-, 3,5,3[image]-trihydroxy-4[image]-methoxy-and 3,5,3[image],4[image],5[image]-pentahydroxy-stilbene. The possible order of biosynthesis of catechin, flavonols and hydroxystilbenes is discussed.