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林产化学与工业 ›› 2007, Vol. 27 ›› Issue (3): 93-97.

• 研究报告 • 上一篇    下一篇

二氧化硅凝胶葡萄糖传感器上羟甲基纤维素酶活性测定

干宁1,2, 徐伟民1, 周雄1, 王志颖1   

  1. 1. 宁波大学 宁波市新型功能材料及其制备科学国家重点实验室培育基地, 浙江 宁波 315211;2. 南京大学 生命科学学院 江苏 南京 210008
  • 收稿日期:2006-02-14 修回日期:1900-01-01 出版日期:2007-06-30 发布日期:2007-06-30

Determination of Carboxymethyl Cellulase Activity by Glucose Sensor Based on SiO2 Gel Membrane

GAN Ning1,2, XU Wei-min1, ZHOU Xiong1, WANG Zhi-ying1   

  1. 1. The State Key Laboratory base of Novel Functional Materials and Preparation Science, Ningbo University, Ningbo 315211, China;2. Biochemistry Department of Faculty of Life Science, Nanjing Univerisity, Nanjing 210008, China
  • Received:2006-02-14 Revised:1900-01-01 Online:2007-06-30 Published:2007-06-30

摘要: 提出了用SiO2凝胶包埋葡萄糖氧化酶(GOD)电化学传感器(GOD/SiO2)测定羟甲基纤维素酶(CMCE)活性的方法,即基于电极对纤维素水解后生成葡萄糖的催化氧化.考察了各种实验条件对CMCE酶活性测定的影响.实验表明,GOD/SiO2电极检测电位为+0.57V(以饱和甘汞电极为参比电极),稳态响应电流与纤维素酶活性在5~400U/L之间有线性关系,该方法可用于微量羟甲基酶活性测定.

关键词: SiO2凝胶, 葡萄糖氧化酶, 电化学传感器, 纤维素酶, 酶活

Abstract: A new biosensor for the assay of carboxymethyl cellulase(CMCE) activity was prepared by modifying a glucose oxidase (GOD) on SiO2 gel film coated on glassy carbon electrode. The amperometric determination was based on electrochemically detected glucose produced by enzymatic reaction of sodium carboxymethyl cellulose(CMC-Na) under the catalysis of CMCE. The modified electrode can sensitively detect CMCE at +0.57 V vs. SCE with a linear response in the range of 5 U/L to 400 U/L under an optimum condition and can be used as a promising method for determination of CMCE activity in micro-analysis.

Key words: SiO2 gel, glucose oxidase, electrochemical sensor, cellulase, enzyme activity

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