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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Pectin Hydroxamic Acids Exhibit Antioxidant Activities in Vitro
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Pectin Hydroxamic Acids Exhibit Antioxidant Activities in Vitro

机译:果胶异羟肟酸具有抗氧化活性

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Commercial pectins with different degrees of esterification (DE) were reacted with equal volumes of 2 M alkaline hydroxylamine (pH 12.0) at room temperature for 4 h to prepare pectin hydroxamic acids (PHAs;DE94T4,DE65T4,and DE25T4) according to a previously reported method (Hou et al.,J.Agric.Food Chem.2003,51,6362-6366) and were used to test the antioxidant and antiradical activities in comparison with those of DE94,DE65,and DE25 pectins.The half-inhibition concentrations,IC_(50),of scavenging activity against DPPH were 1.51,5.43,and 5.63 mg/mL for DE94T4,DE65T4,and DE25T4,respectively,and were much lower than those of corresponding DE pectins under the same concentrations.The scavenging activities of PHAs for DPPH radicals were positively correlated with original DE values of pectin.The optimal pH of DE94T4 for scavenging DPPH radicals was 7.9 or 8.0.Using electron spin resonance (ESR) for scavenging hydroxyl radicals,under the same concentrations of 125mug/mL,DE94T4,DE65T4,and DE25T4,respectively,exhibited 73.53,69.01,and 55.17% antiradical activities.PHAs also exhibited protection against hydroxyl radical-mediated DNA damage and anti-human low-density lipoprotein peroxidation tests.
机译:根据先前的报道,将具有不同酯化度(DE)的市售果胶与等体积的2 M碱性羟胺(pH 12.0)在室温下反应4小时,以制备果胶异羟肟酸(PHA; DE94T4,DE65T4和DE25T4)。方法(Hou等,J.Agric.Food Chem.2003,51,6362-6366),并与DE94,DE65和DE25果胶进行了比较,以测试其抗氧化和抗自由基活性。 ,IC_(50)对DPPH的清除活性分别为DE94T4,DE65T4和DE25T4的1.51、5.43和5.63 mg / mL,并且在相同浓度下远低于相应的DE果胶。 DPPH自由基的PHA与果胶的原始DE值呈正相关.DE94T4清除DPPH自由基的最佳pH为7.9或8.0。在相同的125mug / mL浓度下,使用电子自旋共振(ESR)清除羟基自由基,DE94T4 ,DE65T4和DE25T 4,分别表现出73.53、69.01和55.17%的抗自由基活性。PHA还具有针对羟自由基介导的DNA损伤和抗人低密度脂蛋白过氧化测试的保护作用。

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