不同干燥方式对火龙果茎多糖理化特性及功能活性的影响

Effects of Different Drying Methods on Physicochemical Properties and Functional Activities of Polysaccharides from Hylocereus undatus Stem

以新鲜火龙果茎为原材料,研究真空干燥、热风干燥、自然晒干、真空冷冻干燥4种干燥方式对火龙果茎多糖的理化特性和功能活性的影响。结果表明:4种干燥方式对火龙果茎多糖得率均有显著影响(P<0.05),其中真空冷冻干燥处理后的火龙果茎多糖得率最高,为(19.75±0.21)%。此外,4种干燥方式均显著影响了火龙果茎多糖的持水力和持油力,其中真空冷冻干燥和热风干燥处理后火龙果茎多糖具有较高的持水和持油力(P<0.05)。体外抗氧化和功能活性试验表明真空冷冻干燥后的火龙果茎多糖具有较好的DPPH·和·OH的清除能力以及较好的葡萄糖束缚能力和α-淀粉酶活力抑制力。因此,真空冷冻干燥方式是获得高品质和高活性火龙果茎多糖的较好处理方式。

The effects of vacuum drying,hot air drying,flat drying and vacuum freeze drying on the physicochemical properties and in vitro hypoglycemic activity of Hylocereus undatus stem polysaccharides were studied.The four drying methods had significant effects the on the pitaya stem polysaccharides.The highest yield of pitaya stem polysaccharides treated by vacuum freeze drying was(19.75±0.21)%.The four drying methods significantly affected the water and oil holding capacity of the pitaya stem polysaccharides(P<0.05).The pitaya stem polysaccharides after vacuum freeze drying and hot air drying had higher water and oil holding capacities than those after other methods.In vitro antioxidant and functional activity experiments showed that the freezedried pitaya stem stem polysaccharide had a better ability to scavenge DPPH·,·OH,as well as good glucose binding ability and α-amylase activity inhibitory activity.Among the drying methods,freeze drying is better to obtain high quality and high activity pitaya stem polysaccharides.