植物单宁对油酸抗氧化性研究

Antioxidant Activities of Tannins to Oleic Acid

以固载单宁皮粉(IT-HP)作为含单宁的成品革模型物,以油酸模拟皮革中的不饱和油脂类加脂剂,研究植物单宁对油酸的抗氧化性。系统研究了固载单宁皮粉中3种不同单宁对油酸的抗氧化作用,并优选抗氧化性最好的黑荆树单宁,考察了单宁用量、pH值和温度等条件对其抗氧化作用的影响。结果表明:3种单宁均具有良好的抑制油酸过氧化作用;抗油酸过氧化能力的强弱顺序为:黑荆树单宁>杨梅单宁>落叶松单宁;黑荆树单宁用量为20%时,抗氧化性最强;较高的pH值有利于黑荆树单宁的抗氧化作用;温度主要对油酸过氧化速度产生影响;在油酸过氧化反应初期,温度对黑荆树单宁抗氧化性的影响较小。

Tannin - immobilized hide powder （ IT - HP） was employed as the leather model and oleic acid was used to mimic the unsaturated fat liquoring agent. The anti - oxidation for three kinds of tannins, black wattle tannin, bayberry tannin, and larch tannin, was investigated. The effects of tannin dosage, pH, studied in detail. Results show that all these three kinds of and temperature on the anti - oxidation of black wattle tannin were tannins have inhibition effect for oleic acid oxidation, with an anti - oxidation effect sequence of black wattle tannin 〉 bayberry tannin 〉 larch tannin. The anti - oxidation activity of black wattle tannin is found to increase with the increasing of tannin dosage. On the other hand, a higher pH is more propitious to anti - oxida- tion effect of black wattle tannin. Temperature mainly affects the oxidation rate of oleic acid, while it applies negligible impact to the anti - oxidation activity of the black wattle tannin in the initial stage of oleic acid oxidation.