海洋胶原低聚肽的分离纯化及其抗氧化活性研究
2012-09-12刘文颖谷瑞增易维学蔡木易
刘文颖,谷瑞增,林 峰,鲁 军,易维学,蔡木易
(中国食品发酵工业研究院,北京 100027)
海洋胶原低聚肽的分离纯化及其抗氧化活性研究
刘文颖,谷瑞增,林 峰,鲁 军,易维学,蔡木易*
(中国食品发酵工业研究院,北京 100027)
通过总抗氧化能力、羟基自由基清除能力、超氧阴离子自由基清除能力及还原能力实验,对海洋胶原低聚肽的体外抗氧化活性进行考察,然后采用反相高效液相色谱(RP-HPLC)对海洋胶原低聚肽进行分离纯化,测定收集得到的11个组分的总抗氧化能力。结果表明,海洋胶原低聚肽具有一定的总抗氧化能力、羟基自由基和超氧阴离子自由基清除能力,并且具有一定的还原能力;RP-HPLC分离纯化后,5个组分的抗氧化活性显著提高,对总肽整体的抗氧化活性起到了重要的作用,并且疏水性肽组分对抗氧化活性的贡献大于亲水性肽组分。
胶原,低聚肽,抗氧化活性,分离纯化
Abstract:The antioxidant activities in vitro of marine collagen oligopeptides (MCOP) were evaluated from four respects by determination of the total antioxidant capacity and the scavenging activities against hydroxyl radical and superoxide radical as well as the reducing power.Then,MCOP was separated and purified by reversed phase high performance liquid chromatography (RP-HPLC)and the total antioxidant capacity of 11 fractions collected was assayed.Results indicated that MCOP exhibited total antioxidant capacity,scavenging activities against hydroxyl radical and superoxide radical and reducing power.After separation and purification by RP-HPLC,5 fractions showed much higher total antioxidant capacity than MCOP,and played an important role in the total antioxidant activity of MCOP.Additionally,hydrophobic peptides in the MCOP presented higher activities than the hydrophilic ones.
Key words:collagen;oligopeptides;antioxidant activity;separation and purification
活性氧和自由基与人类的许多疾病如癌症、老化、动脉粥样硬化等的发病机理相关[1-2]。外源性抗氧化剂有助于降低体内自由基水平,防止脂质过氧化,帮助机体抵御疾病。人工合成的抗氧化剂如BHA、BHT、TBHQ、PG虽然抗氧化效果很好,但对人体肝、脾、肺有蓄积性致癌作用[3]。近年来,天然抗氧化活性肽因具有较强的活性和很高的安全性,而备受科研工作者的关注,已成为国内外的研究重点。天然抗氧化肽分子质量相对较低,易于被人体消化吸收,可通过减少羟自由基、超氧阴离子自由基、抑制脂质过氧化以及螯合金属离子等达到抗衰老的效果[4]。……
