Abstract
Dihydroquercetin (3,5,7,3' A'-pentahydroxytlavanone) is a major constituent of the alcohol soluble materials in the wood of Larch species and the wood and bark of Douglas-fir. A sensitive analytical method is needed to enable rapid assessment of amounts of dihydroquercetin (DHQ) when processing commercial materials and for studies of biochemical aspects of DHQ formation. Ability to analyse very small wood SaD1ples is a most important criterion from a biochemical standpoint. Most quantitative estimates of the amount of DHQ in wood have employed the method of BARTON AND .GARDNER1.!. This method suffers from limitations in that it is spet:ific for 3-hydroxyflavanones not only DHQ, has a relatively low sensitivity, and is
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