食品科学

• 基础研究 • 上一篇    下一篇

羟自由基氧化体系对银鲳肌原纤维蛋白生化特性及其构象单元的影响

陈霞霞,杨文鸽*,吕梁玉,胡小超,高喜乐   

  1. 宁波大学海洋学院,浙江省动物蛋白食品精深加工重点实验室,浙江海洋高效健康养殖协同创新中心,浙江 宁波 315211
  • 出版日期:2016-12-15 发布日期:2016-12-21

Effects of Hydroxyl Radical Oxidation on Biochemical Properties and Conformation of Myofibrillar Protein in Pampus argenteus

CHEN Xiaxia, YANG Wenge*, LÜ Liangyu, HU Xiaochao, GAO Xile   

  1. Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Collaborative Innovation Center for
    Zhejiang Marine High-Efficiency and Healthy Aquaculture, School of Marine Science, Ningbo University, Ningbo 315211, China
  • Online:2016-12-15 Published:2016-12-21

摘要: 采用FeCl3-VC-H2O2羟自由基模拟氧化体系,探究不同氧化剂浓度和氧化时间对银鲳肌原纤维蛋白生化特性及其空间结构的影响。结果表明:随着氧化时间的延长,高浓度(1.0 mmol/L H2O2)和低浓度(0.1 mmol/LH2O2)氧化剂组均使银鲳肉肌原纤维蛋白的羰基含量、表面疏水性、二聚酪氨酸含量上升,总巯基含量下降;相比于低浓度氧化剂组,高浓度氧化剂组的影响更加明显。拉曼图谱显示:随氧化时间延长和氧化剂浓度增大,银鲳肌原纤维蛋白微环境极性总体呈增强趋势,酰胺Ⅰ带向长波方向移动,其α-螺旋比例下降,而β-折叠比例上升。结论:在羟自由基氧化体系中,银鲳肌原纤维蛋白发生了显著氧化,导致其结构和生化指标发生改变。

关键词: 羟自由基, 蛋白氧化, 拉曼光谱, 银鲳, 空间构象

Abstract: This study explored the impact of different oxidant concentrations and oxidation times on biochemical
characteristics and spatial structure of myofibrillar protein in back muscles of Pampus argenteus using FeCl3-VC-H2O2
hydroxyl radical-generating systems. The results showed that Pampus argenteus myofibrillar proteins were attacked by free
radicals generated from FeCl3-VC-H2O2 systems, causing changes in some amino acid side chains to produce polymers.
With the extension of oxidation time, both the high (1.0 mmol/L H2O2) and low concentration (0.1 mmol/L H2O2) oxidant
groups showed a significant increase in myofibrillar protein carbonyl content, surface hydrophobicity and dityrosine content,
and a decrease in total sulfhydryl content, but the effect of the high oxidant concentration was more significant. Raman
spectroscopic analysis indicated that, with the increase in oxidation time and oxidant concentration, the microenvironmental
polarity of myofibrillar protein was generally enhanced. The amide Ⅰ band was shifted to longer wavelength along with
a reduction in α-helix content and an increase in β-sheet content. In conclusion, P. argenteus myofibrillar protein could be
oxidized in hydroxyl radical-generating systems, leading to its structural and biochemical changes.

Key words: hydroxyl radical, protein oxidation, Raman spectroscopy, Pampus argenteus, conformation

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