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油菜蜂花粉中活性肽的制备及其抗氧化性的研究
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摘要
油菜蜂花粉是自然界中存在的营养丰富的一种纯天然食品,营养成分搭配合理,并且富含蛋白质和功能因子,能够加强人体的免疫系统和生理功能,已经日益受到人们的青睐。但是由于油菜蜂花粉本身带有青涩味,口感较差,使得蜂花粉的利用率较低。
     油菜蜂花粉中蛋白约占干重的30%,成分较为复杂,难以提取和分离。本文利用三种不同蛋白酶将油菜蜂花粉水解,以水解度为标准,选择对油菜蜂花粉水解效果较好的蛋白酶,其中碱性蛋白酶在适宜的条件下水解效果最佳。故用碱性蛋白酶水解油菜蜂花粉,并通过不同的渗透滤膜对酶解物进行分离纯化,按照相对分子质量分成4种样品:200Da~1000Da、1000Da~5000Da、5000Da~10000Da和10000Da以上不同分子量段的样品,应用清除超氧阴离子自由基、清除羟自由基和脂质过氧化三种抗氧化模型对油菜蜂花粉水提物、酶解物及酶解物分段后样品进行抗氧化能力评估。试验结果表明:油菜蜂花粉酶解物清除超氧阴离子和羟自由基的能力得到显著的提高,在50mg/mL的浓度下抑制能力分别提高20%和30%左右,而且酶解物经渗透膜过滤后能进一步提高样品的抗氧化能力。
Bee collected rape pollen (BCRP) is a natural product with high nutritional value due to containing considerable amount of proteins and functional components. More and more consumers and researchers are interested in BCRP because it is able to boost immunity system of human. However, high antigenicity and astringent taste of BCRP limits its application in human diet.
     Proteins approximately account for 30% (w/w) of BCRP and are very difficult to be completely extracted due the interaction with other components. Three different proteases were used to extract the protein in this research to reach a standard hydrolysis degree. Alkaline protease was selected due to best hydrolysis effect. The enzymatic hydrolysates were separated into 4 different portion based on their molecular weight range by membrane filtration, i.g. 200Da~1000Da、1000Da~5000Da、5000Da~10000Da and above 10000Da. The antioxidant activities of these samples was evaluated bu three antioxidant models in vitro, namely hydroxyl radical scavenging, superoxide anion radical scavenging and and anti-peroxidation of lipid. It was found that the antioxidant activities of enzymatic hydrolysates were better than that of water exteact of BCRP, and microfiltration membrane was an effect way to improve the antioxidant activity of the enzymatic hydrolysates.
引文
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