不同来源膳食纤维品质分析及抗氧化活性研究

Quality analysis and antioxidant activity of dietary fiber from different sources

以酶解法制备金针菇菇根、大麦苗、麦麸粉、苦瓜粉、西兰花老茎、魔芋胶粉、芦笋下脚料总膳食纤维为原料,从物化特性、吸附能力、抗氧化活性等方面进行比较。结果表明:魔芋膳食纤维持水力、膨胀力最强,分别为47.76g/g、14.65mL/g;持油力差异不大,均在1.5g/g左右;西兰花老茎膳食纤维阳离子交换能力最强,为0.64mmol/g;金针菇、大麦苗、魔芋3种膳食纤维DPPH自由基清除能力较强,均在70.0%以上;芦笋、苦瓜膳食纤维还原能力较强;大麦苗膳食纤维羟基自由基清除能力最强,为66.594%;7种膳食纤维金属螯合力差异不大,均在93.0%以上。研究结果为肥胖、便秘等特殊人群专用膳食纤维的筛选提供一定的理论依据与借鉴。

In this paper, the enzymatic hydrolysis method was used to prepare dietery fiber of the mushroom root, barley seedling, wheat bran powder, bitter melon powder, broccoli old stem, konjac powder and asparagus waste. Their physicochemical properties, adsorption capacity, antioxidant activity were compared. The results showed that the konjac dietary fiber had the strongest water holding capacity and expansive power, which were 47.76 g/g and 14.65 mL/g, respectively. The oil holding power was not much different, both were about 1.5 g/g;the cation exchange capacity of broccoli old stem dietary fiber was the strongest, 0.64 mmol/g;Flammulina velutipes, barley seedlings, konjac dietary fiber DPPH free radical scavenging ability is stronger, are above 70.0%;Asparagus, bitter melon dietary fiber reduction ability were stronger;barley seedlings dietary fiber hydroxyl free radical scavenging ability was the strongest, which was 66.594%;the metal chelation force of the seven dietary fibers was not much different, all above 93.0%. It provides a theoretical basis and reference for the screening of special dietary fiber for special populations such as obesity and constipation.