乙酰化降解海带多糖的抗氧化、吸湿/保湿性能探究

采用超声降解和醋酸酐法联合处理海带多糖,制备得到乙酰化降解海带多糖,并对其化学组成、理化性质、抗氧化性能及吸湿/保湿性能进行探究。结果表明:醋酸酐法成功将乙酰基团引入降解海带多糖中,且乙酰化降解海带多糖的溶解能力较海带多糖得到明显提升,相对粘度较海带多糖明显降低;体外抗氧化能力(DPPH自由基清除、羟基自由基清除能力、总还原能力)均得到显著提高(p <0.05),其中总还原能力较海带多糖LP提高87.99%;吸湿能力得到提高,相对湿度为81%的条件下较普通海带多糖增长至25.4%,且所有海带多糖及其衍生物的保湿能力均优于常用保湿剂甘油。因此,超声降解和醋酸酐法联合处理,可以改善海带多糖理化性质,并显著提升其抗氧化能力及吸湿/保湿能力。

Antioxidant and Absorption/Retention Activities of the Acetylated Degraded Laminaria japonica Polysaccharides

Acetylated degraded polysaccharides from Laminaria japonica( ADLP) were prepared by the combination of ultrasonic degradation and acetic anhydride method,and the chemical composition,physicochemical properties,antioxidant activity and absorption/retention activities of polysaccharides were evaluated. The results showed that,the acetic anhydride method had successfully introduced the acetyl group into the degraded polysaccharides from Laminaria japonica( DLP),the dissolving capacity of ADLP was significantly better than that of LP,the relative viscosity of ADLP was significantly lower than that of LP.Its antioxidant activities( DPPH free radical scavenging ability,hydroxyl radical scavenging ability,and total reducing ability) were significantly improved( p < 0.05),the total reducing ability of ADLP was 87.99% higher than that of Laminaria japonica polysaccharides( LP),the moisture absorption activities of ADLP were significantly improved,its moisture absorption capacity was increased to 25.4% compared with LP,all polysaccharides showed greater moisture retention activities than glycerol.These results suggested that the combined treatment of degradation and acetylation could significantly enhance the physicochemical properties,in vitro antioxidant activities,and moisture absorption/retention activities of Laminaria japonica polysaccharides.