ANTIOXIDATION ACTIVITIES OF WOOD EXTRACTIVES,DIARYLHEPANOIDS FROM BETULACEAE,AND HIGHER UTILIZATION OF THE FUNCTION.

1994 Fiscal Year Final Research Report Summary

• Project/Area Number: 05660184
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: 林産学
• Research Institution: GIFU UNIVERSITY
• Principal Investigator: OHASHI Hideo GIFU UNIVERSITY,AGRICULTURE,PROFESSOR, 農学部, 教授 (80021723)
• Project Period (FY): 1993 – 1994
• Keywords: lipid peroxidation / antioxidation / antioxidant / antioxidation activity / radical-scavenging activity / tree / phenolic extractives / diarylheptanoid

Research Abstract

In order to develop an affective utilization method of tree resouces, about 80 wood extractives such as diarylheptanoids of Ostrya japonica wood (Betulaceae) were tested and evaluated to obtain new antioxidants for food and medicine industries. The evaluation was based on two test results, numeric values on peroxidation products of methyl linolate and change values of optical densities on radical-scavenging for 1,1-diphenyl-2-picrylhydrazil radical. Further, the correlation of antioxidation activities and structure of wood extractives was discussed.
Based on tests, together with such diarylheptanoids as trideoxyasadanin, many extractives with high antioxidation activities were found out and valued as effective natural antioxidants ; oxyresveratol and resveratrol of stitilbens, robinetin, myricetin and quercetin of flavonoids, and bis- (p-hydroxyphenyl) -1,3-butadiene of diarylbutanoids.
Also, from the discussion on the correlation of antioxidation activities and structure of extractives, it was revealed that the extractives with high antioxidation activities possesed plural aromatic hydroxyl groups (vicinal hydroxyl groups) , carbon double bonds conjugating with aromatic rings (in the above stiibene and butadiene) and/or C-C directly connected aromatic rings (in the above trideoxyasadanin).