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

为了开发树木资源的有效利用方法，对桦木科木属木材的二芳基庚烷类等80余种木材抽提物进行了测定和评价，以期获得新的食品和医药用抗氧化剂。根据亚油酸甲酯过氧化产物的数值和1，1-二苯基-2-苦基肼自由基清除光密度变化值两个试验结果进行评价。在此基础上，结合三脱氧细辛脂素等二芳基庚烷类化合物，筛选出多种具有较高抗氧化活性的木材提取物，被认为是有效的天然抗氧化剂;氧化白藜芦醇和白藜芦醇的stitilbens，刺槐素，杨梅素和槲皮素的黄酮类化合物，和双-同时，从抗氧化活性与萃取物结构的相关性讨论中发现，抗氧化活性高的萃取物含有多个芳香羟基（邻位羟基）、与芳环共轭的碳双键（在上述芪和丁二烯中）和/或C-C直接连接的芳环（在上述三脱氧asadanin中）。

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).