食品科学 ›› 2018, Vol. 39 ›› Issue (11): 1-7.doi: 10.7506/spkx1002-6630-201811001

• 基础研究 •    下一篇

南极磷虾抗冻蛋白热滞活性的差示扫描量热法评价

马庆保1,2,刘志东1,*   

  1. 1.中国水产科学研究院东海水产研究所,上海 200090;2.上海海洋大学食品学院,上海 201306
  • 出版日期:2018-06-15 发布日期:2018-06-06
  • 基金资助:
    国家自然科学基金面上项目(31471687);上海市自然科学基金项目(13ZR1449900);上海市科技兴农项目(沪农科攻字(2015)第5-5号);中央级公益性科研院所基本科研业务费专项资金项目(2016HY-ZD0903;2016HY-ZD1003)

Determination of Thermal Hysteresis Activity of Antifreeze Protein from Antarctic Krill (Euphausia superba) by Differential Scanning Calorimetry

MA Qingbao1,2, LIU Zhidong1,*   

  1. 1. East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; 2. College of Food Sciences and Technology, Shanghai Ocean University, Shanghai 201306, China
  • Online:2018-06-15 Published:2018-06-06

摘要: 本研究采用差示扫描量热(differential scanning calorimetry,DSC)法评价了南极磷虾抗冻蛋白的热滞活性 (thermal hysteresis activity,THA)并进行了优化实验。以纯化的南极磷虾抗冻蛋白为研究对象,采用DSC法研究 了样品的升降温速率、样品质量浓度、冰晶含量、缓冲体系等对南极磷虾抗冻蛋白THA的影响。结果表明,南极磷 虾抗冻蛋白分子质量约为76 kDa,THA为1.76 ℃。通过优化实验确定以DSC法评价南极磷虾抗冻蛋白的THA升降温 速率为1.00 ℃/min,样品质量浓度为1.0 mg/mL,冰晶含量为10%~15%之间;不同的缓冲体系对THA也有较大的影 响。因此,DSC法可以用于南极磷虾抗冻蛋白的THA评价,重要参数经过优化后能够有效地评价抗冻蛋白的THA。

关键词: 南极磷虾, 抗冻蛋白, 热滞活性, 差示扫描量热法, 评价

Abstract: In this study, we investigated whether differential scanning calorimetry (DSC) can be used to detect thermal hysteresis activity (THA) of antifreeze proteins (AFPs) from Antarctic krill. Important experimental conditions, such as cooling rate, sample concentration, ice crystal content and buffer system, were optimized. The results showed that the molecular weight of AFPs was about 76 kDa and its THA was 1.76 ℃. A cooling rate of 1.00 ℃/min, a sample concentration of 1.0 mg/mL and an ice crystal content ranging from 10% to 15% were found to be the optimal conditions. THA was greatly affected by different buffer systems. This study led us to conclude that DSC can be effectively used for the evaluation of THA of AFPs.

Key words: Euphausia superba, antifreeze protein, thermal hysteresis activity, differential scanning calorimetry, evaluation

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