浙江农业学报 ›› 2022, Vol. 34 ›› Issue (5): 1061-1072.DOI: 10.3969/j.issn.1004-1524.2022.05.21

• 食品科学 • 上一篇    下一篇

龙须菜蛋白质的提取及其酶解产物的抗氧化特性

刘晶1,2(), 胡晓2, 杨贤庆2,*(), 陈胜军2, 吴燕燕2, 李来好2, 戚勃2, 邓建朝2   

  1. 1.上海海洋大学 食品学院,上海 201306
    2.中国水产科学研究院 南海水产研究所,国家水产品加工技术研发中心,农业农村部水产品加工重点实验室,广东 广州 510300
  • 收稿日期:2020-11-16 出版日期:2022-05-25 发布日期:2022-06-06
  • 通讯作者: 杨贤庆
  • 作者简介:* 杨贤庆,E-mail: yxqgd@163.com
    刘晶(1996—),女,湖南常德人,硕士研究生,研究方向为水产功能性肽。E-mail: lj15115772810@163.com
  • 基金资助:
    现代农业产业技术体系建设专项(CARS-50);广东省现代农业产业技术体系创新团队建设专项资金(2019KJ151);农业农村部水产品加工重点实验室开放基金(NYJG201706);广东省海洋与渔业发展专项资金(技术推广)(2017A0001);国家水产品质量安全风险评估专项(GJFP201800904);广东省重点领域研发计划(2020B1111030004)

Extraction and antioxidant activity of enzymolysis products of Gracilaria lemaneiformis protein

LIU Jing1,2(), HU Xiao2, YANG Xianqing2,*(), CHEN Shengjun2, WU Yanyan2, LI Laihao2, QI Bo2, DENG Jianchao2   

  1. 1. College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306,China
    2. Key Laboratory of Aquatic Product Processing, Ministry of Agriculture and Rural Affairs, National Research and Development Center for Aquatic Product Processing, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300,China
  • Received:2020-11-16 Online:2022-05-25 Published:2022-06-06
  • Contact: YANG Xianqing

摘要:

以干燥后的龙须菜(Gracilaria lemaneiformis)粉为原料,采用超声辅助碱提酸沉法提取龙须菜蛋白质。首先通过单因素实验选择了影响龙须菜蛋白质提取率的因素及水平范围,然后以Box-Behnken中心组合设计原理建立二次响应面回归模型,确定了最佳提取条件为:碱浓度0.2 mol·L-1、液固比24:1 (mL·g-1)、超声时间70 min、超声功率482 W,在此条件下的龙须菜蛋白质提取率为73.78%。此外,对提取得到的龙须菜蛋白质进行了酶解,分别研究了木瓜蛋白酶、碱性蛋白酶、植物蛋白复合酶、胰蛋白酶和胃蛋白酶对酶解产物抗氧化活性和分子量的影响。结果表明,在酶解4 h后,碱性蛋白酶酶解产物的抗氧化活性显著高于其他4种酶酶解产物和龙须菜蛋白质,其铁离子还原能力(ferric reducing antioxidant power, FRAP)、1,1-二苯基-2-苦基肼(DPPH)自由基清除率和2,2'-联氮-双(3-乙基苯并噻唑啉-6-磺酸)二铵盐(ABTS)自由基清除率分别为81.88 μg·mL-1、63.29%、64.25%,分子量主要集中在1 500 u以下。本研究可为龙须菜蛋白质的提取及其高值化利用提供一定参考。

关键词: 龙须菜, 蛋白提取, 酶解产物, 抗氧化活性, 基础特性

Abstract:

The method for extracting protein from dried Gracilaria lemaneiformis powder using ultrasonic assisted alkali dissolution and acid precipitation was optimized by single-factor experiment and Box-Behnken central composite design. The results indicated that the optimal extraction conditions were as follows: alkali concentration 0.2 mol·L-1, liquid-solid ratio 24:1 (mL·g-1), ultrasonic time 70 min and ultrasonic power 482 W. The extraction rate of protein was 73.78%. The effects of papain, alkaline protease, plant protein complex enzyme, trypsin and pepsin on antioxidant activity and molecular weight of hydrolysates from G. lemaneiformis were investigated. The results showed that the antioxidant activity of alkaline protease enzymolysis products was significantly higher than that of the other four hydrolysates and G. lemaneiformis protein. After 4 h of hydrolysis, the ferric reducing antioxidant power (FRAP), the DPPH free radical scavenging rate and the ABTS free radical scavenging rate of alkaline protease enzymolysis products were 81.88 μg·mL-1, 63.29% and 64.25%, respectively. The molecular weight of the hydrolysates was mainly below 1 500 u. This study could provide a reference for protein extraction and high value utilization of G. lemaneiformis.

Key words: Gracilaria lemanensis, protein extraction, enzymolysis products, antioxidant activity, basic characteristic

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