柑橘类果皮膳食纤维抗氧化特性比较

Comparison of Antioxidant Properties of Dietary Fibre Extracted from Citrus Fruits

通过超声工艺辅助提取四川红桔、砂糖桔、赣南脐橙、福建蜜柚以及丑柑5种柑橘类水果皮中的膳食纤维,并对其理化成分、功能特性、主要酚类物质含量及抗氧化特性进行了测定比较。结果表明:丑柑皮膳食纤维的水分、蛋白质、总糖含量、持水性和膨胀性均最高,分别为12.83%、23.85%、5.52%、852.67%和667.06%;蜜柚的灰分、脂肪含量和持油性最高,分别为4.49%、1.10%和278.12%;砂糖桔皮的总酚含量最高;脐橙总类黄酮和总黄烷含量最高;丑柑皮的单宁含量最高,达2.26mg/g;四川红桔皮的总抗氧化能力、Fe^(2+)螯合率和DPPH·自由基清除率均高于其他4种柑橘类膳食纤维,具有较好的抗氧化活性。

The dietary fiber of Sichuan Red orange,Sugar orange,Gannan navel orange,Fujian pomelo and Ugly orange were extracted by ethanol ultrasound process.Its chemical components,features mainly the phenolics content and antioxidant activity were determined.And the oxidation characteristics of 5 kinds of citrus dietary fiber were compared overall.The results showed that the moisture content,protein content,total sugar content,water holding capacity and expansibility of Chou citrus peel dietary fiber were 12.83%,23.85 mg/g,5.52%,852.67%and 667.06%,respectively;the ash content,fat content and oil holding capacity of pomelo were the highest,which were 4.49%and 4.49%,respectively The results showed that the content of total phenolics in sugar orange peel was the highest,the content of total flavonoids and flavane in navel orange was the highest,and the tannin content of ugly orange peel was the highest(2.26 mg/g).The results showed that the total antioxidant capacity,Fe^(2+) chelation rate and DPPH·free radical scavenging rate of Sichuan Red orange peel were higher than those of the other four kinds of Citrus dietary fiber,the antioxidant activity is better.