食品科学 ›› 2022, Vol. 43 ›› Issue (6): 195-203.doi: 10.7506/spkx1002-6630-20210131-374

• 生物工程 • 上一篇    下一篇

鲟鱼皮中二肽基肽酶-IV抑制肽的分离纯化与鉴定

尹剑,武瑞赟,胡锦蓉,李平兰   

  1. (中国农业大学食品科学与营养工程学院,北京 100083)
  • 出版日期:2022-03-25 发布日期:2022-03-28
  • 基金资助:
    北京市鲟鱼鲑鳟鱼创新团队项目(BAIC08-2021)

Purification and Identification of Dipeptidyl Peptidase IV Inhibitory Peptide from Sturgeon Skin Collagen

YIN Jian, WU Ruiyun, HU Jinrong, LI Pinglan   

  1. (College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China)
  • Online:2022-03-25 Published:2022-03-28

摘要: 为从鲟鱼皮中分离提取出二肽基肽酶-IV(dipeptidyl peptidase IV,DPP-IV)抑制活性肽,以鲟鱼皮胶原蛋白为主要材料,利用蛋白酶进行酶解,以DPP-IV抑制率为主要考察指标,在单因素试验的基础上,进一步利用响应面法优化了鲟鱼鱼皮中DPP-IV抑制肽的制备工艺条件,确定最佳酶解条件为:酶解温度50?℃、料液比1∶100(g/mL)、pH?6.12、加酶量10?170.35?U/g、酶解时间12.12?h。在此基础上,通过超滤、凝胶层析及反相高效液相色谱的方法对酶解产物进行分离纯化;采用液相色谱-串联质谱法对多肽进行鉴定,结果显示纯化后具有DPP-IV抑制活性肽氨基酸组成为:甘氨酸-脯氨酸-丝氨酸-甘氨酸-亮氨酸-天冬氨酸-甘氨酸-丙氨酸-赖氨酸(GPSGLDGAK),IC50值可达(61.27±1.16)μmol/L。本研究结果可为利用鲟鱼皮生产新型的生物活性成分提供参考。

关键词: 鲟鱼皮;二肽基肽酶-IV抑制活性肽;酶解法

Abstract: In order to prepare dipeptidyl peptidase IV (DPP-IV) inhibitory peptide, sturgeon skin collagen was hydrolyzed by protease. A combination of one-factor-at-a-time method and response surface methodology was used optimize the preparation conditions based on percentage of DPP-IV inhibition. The optimal enzymatic hydrolysis conditions were determined as follows: temperature 50 ℃, solid-to-liquid ratio 1:100 (g/mL), pH 6.12, enzyme dosage 10 170.35 U/g, and enzymatic hydrolysis time 12.12 h. The hydrolysate prepared under the optimized conditions was separated and purified by sequential ultrafiltration, gel filtration chromatography and reverse-phase high performance liquid chromatography (RP-HPLC). As identified by liquid chromatography-tandem mass spectrometry (LC-MS/MS), the amino acid composition of the purified peptide with DPP-IV inhibitory activity was GPSGLDGAK, and its half-maximum inhibitory concentration (IC50) value was (61.27 ± 1.16) μmol/L. The results of this study can provide a reference for the production of new bioactive components from sturgeon skin.

Key words: sturgeon skin; dipeptidyl peptidase IV inhibitory peptide; enzymatic hydrolysis

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