纪晨雪, 牛永武, 杨岩晓, 乔杉, 赵仁勇. 蚜虫莫氏黑粉菌脂肪酶的酶学性质研究[J]. 河南工业大学学报自然科学版, 2023, 44(2): 8-15. DOI: 10.16433/j.1673-2383.2023.02.002
    引用本文: 纪晨雪, 牛永武, 杨岩晓, 乔杉, 赵仁勇. 蚜虫莫氏黑粉菌脂肪酶的酶学性质研究[J]. 河南工业大学学报自然科学版, 2023, 44(2): 8-15. DOI: 10.16433/j.1673-2383.2023.02.002
    JI Chenxue, NIU Yongwu, YANG Yanxiao, QIAO Shan, ZHAO Renyong. Enzymatic properties and kinetics of a lipase from Moesziomyces aphidis[J]. Journal of Henan University of Technology(Natural Science Edition), 2023, 44(2): 8-15. DOI: 10.16433/j.1673-2383.2023.02.002
    Citation: JI Chenxue, NIU Yongwu, YANG Yanxiao, QIAO Shan, ZHAO Renyong. Enzymatic properties and kinetics of a lipase from Moesziomyces aphidis[J]. Journal of Henan University of Technology(Natural Science Edition), 2023, 44(2): 8-15. DOI: 10.16433/j.1673-2383.2023.02.002

    蚜虫莫氏黑粉菌脂肪酶的酶学性质研究

    Enzymatic properties and kinetics of a lipase from Moesziomyces aphidis

    • 摘要: 为明确蚜虫莫氏黑粉菌脂肪酶的应用价值,研究了反应温度、pH值、金属离子、表面活性剂、抑制剂和有机溶剂等对脂肪酶活性的影响。结果表明:蚜虫莫氏黑粉菌脂肪酶的最适反应温度为70 ℃、pH值为8,具有较好的温度稳定性和pH耐受性,是一种常温发酵合成的耐高温碱性脂肪酶;Zn2+对其活力具有显著的抑制作用;吐温-20、吐温-80、曲拉通-100等表面活性剂和甲醇、乙醇、正丙醇、异丙醇、丙酮等有机溶剂对脂肪酶活力均表现出明显的促进作用;该脂肪酶对三油酸甘油酯的水解无位置特异性;水解对硝基苯酚棕榈酸酯(p-NPP)的米氏常数Km为1.14 mmol/L,最大反应速率vmax为119.05 mol/min。蚜虫莫氏黑粉菌脂肪酶在高温、弱碱性、有机溶剂等工业反应条件下具有良好的应用前景。

       

      Abstract: To clarify the application of the lipase from Moesziomyces aphidis, this research was conducted to investigate the effects of reaction temperature, pH and stability, the effects of metal ions, surfactants, inhibitors and organic solvents on the activity of lipase. The results showed that the optimum reaction temperature and pH value of the lipase were 70 ℃ and 8, respectively, this lipase had good temperature stability and pH tolerance, and it was a kind of high temperature resistant alkaline lipase synthesized by room temperature fermentation. Zn2+ had a significant inhibitory effect on its activity. Surfactants such as Tween-20, Tween-80, Triton 100 and organic solvents such as methanol, ethanol, n-propanol, isopropanol and acetone showed significant promotion effect on lipase activity. The lipase was able to hydrolyze both the 1,3 and 1,2 ester bonds of triglycerides, the kinetic parameters Km and vmax for hydrolysis of p-NPP were 1.14 mmol/L and 119.05 mol/min, respectively. Therefore, the synthetic lipase of Moesziomyces aphidis has good prospects for application under industrial reaction conditions such as high temperature, weak alkalinity and organic solvents.

       

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