酸化防止剤に関する研究 (第1報) : ヒドロキノン誘導体の酸化防止性について
スポンサーリンク
概要
- 論文の詳細を見る
Antioxidant ability of alkylen-bis-phenol derivatives was investigated. The methyl ester of fatty acids used for the test was prepared by alkali-catalyzed methanolysis of soybeen oil, followed by distillation in vacuum under nitrogen stream. The derivatives were added to the methyl ester at 0.01% level, and were measured by active oxygen method (AOM) and electron donnor effect.<BR>ρ-Dimethoxy derivatives (I, V, VI) did not show any effect. Hydroxy derivatives (II, III, IV, VII) improved the oxidative stability of the methyl ester, but the effect of derivatives containing carbonyl in the chain (II, III, IV) was less than half of the effect of the sample without containing carbonyl group (VII), 1, 16-bis (2, 5-dihydroxyphenyl) hexadecane (BDPH). The difference observed in the antioxidant ability may probably due to a result of hydrogen-bonding between hydroxyl and carbonyl radical, which reduces hydrogen or electron donative ability from the molecule.<BR>The antioxidant ability of BDPH was also compared with the commonly used antioxidant for vegetable oils, such as nordihyroguaiaretic acid (NDGA), α-tocopherol (α-Toc), propyl gallate (PG), ethyl protocatecuate (EP), buthylated hydroxyanisole (BHA) and dibutyl hydroxytoluen (BHT). BDPH was more effective than these antioxidants. The effect of BDPH increased proportionally with the concentration within 0.005 to 0.1%.<BR>Additivity in the antioxidant ability of BDPH with other typical antioxidants was observed at 0.01% levels. The systems of BDPH plus BHT, and BDPH plus α-Toc showed super-additivities, while BDPH plus NDGA was less effective than EDPH plus BHA.<BR>From these observations BDPH might be a usefull antioxidant practically.
- 社団法人 日本油化学会の論文