基于超声波辅助提取的三种鸢尾多糖抗氧化功效分析OA

To screen novel antioxidant products derived from plant polysaccharides,this study utilized the rhizomes of Iris versicolor,I.×Louisiana,and I.pallida as materials.An ultrasonic-assisted extraction system was optimized to isolate crude polysaccharides,followed by quantification and comprehensive antioxidant efficacy evaluation.The results demonstrated that I.versicolor exhibited higher crude polysaccharide content at 17.40％,significantly surpassing I.×Louisiana(4.68％)and I.pallida(4.94％).In antioxidant activity tests,I.versicolor crude polysaccharide showed more remarkable performance,achieving a DPPH radical scavenging rate of 98.02％at the concentration of 1.0 mg·mL-¹,which was substantially higher than that of I.×Louisiana(46.86％)and I.pallida(54.21％).After purification,the DPPH and ABTS+radical scavenging rate,and total reducing power of I.versicolor and I.pallida polysaccharides significantly decreased.However,the hydroxyl radical scavenging ability of all three purified Iris polysaccharides exhibited an extremely significant improvement.Comprehensive evaluation of these indicators revealed that Iris polysaccharides possess strong scavenging capabilities against DPPH radicals,hydroxyl radicals,and ABTS+radicals,with I.versicolor polysaccharide demonstrating the most outstanding performance and considerable application potential.This study provides a scientific basis for the development of novel natural antioxidant products derived from Iris polysaccharides.