采用超声波辅助氨基磺酸-N,N-二甲基甲酰胺(DMF)法对苹果水溶性膳食纤维(SDF)进行硫酸酯化修饰,研究了硫酸酯化苹果SDF对·OH、O-2·及氧自由基的清除能力。红外光谱分析显示,硫酸酯化苹果SDF具有硫酸酯键的特征吸收峰。抗氧化活性测定结果表明,其对羟自由基、超氧阴离子及氧自由基清除能力提高。

The apple soluble dietary fiber was sulfated using ultrasonic-assisted amino acid-N,N-dimethylformamide method. The scavenging effects of sulfated SDF on hydroxyl radical,superoxide anion radical and oxygen radical were studied. From FTIR,the sulfated soluble dietary fiber had the typical sulfated functional groups. The results of antioxidant activity revealed that the scavenging capacities of sulfated SDF on the hydroxyl free radicals,superoxide anion and oxygen radical were improved compared with the untreated ones.