壳聚糖和纳米金混合膜生物传感器在葡萄糖检测中的应用

摘要

背景:目前只有通过控制血糖浓度的方法来控制糖尿病发病率,因此创建一种快速、稳定、精确测定血糖浓度的方法成为研究者关注的焦点.目的:观察壳聚糖和纳米金混合膜在电化学葡萄糖传感器中的作用.设计、时间、地点:观察实验,于2009-02/04在解放军广州军区广州总医院医学实验科内完成.材料:将CHIT/AuNPs膜电镀到金电极表面,利用戊二醛交联固定葡萄糖氧化酶,制得葡萄糖传感器.方法:以K3Fe(CN)6为探针离子,采用三电极循环伏安法考察了传感器的组装特性及电催化活性,通过线性扫描伏安法考察了传感器对葡萄糖的响应特性,并对实验条件进行了优化及稳定性与重复性进行考察.主要观察指标:不同修饰电极的循环伏安特性,葡萄糖浓度和响应电流的关系.结果:在0.001～6 mmol/L范围内,葡萄糖浓度和响应峰电流成线性关系.且该传感器具有操作简便,响应速度快(＜2 s),重复性及稳定性好,检出限低(26.56 μmol/L),抗干扰能力强等优点.结论:以壳聚糖和纳米金混合膜材料研制的葡萄糖传感器具有好的重复性及稳定性,并且对葡萄糖的响应速度快,评测结果为可以应用于临床.%BACKGROUND:At present,syndromes happening frequency of diabetes mellitus can be controlled through regulating glucose concentration in blood.Therefore,a fast,steady,accurate glucose biosensor has been an intense area of focus for investigators.OBJECTIVE:To observe the effect of chitosan-gold nanoparticles hybrid film on electrochemical glucose biosensor.DESIGN,TIME AND SETTING:The observation experiment was performed at the Department of Medicine Laboratory,General Hospital,Guangzhou Military Command of Chinese PLA from February to April 2009.MATERIALS:Based on the immobilization of glucose oxidase (GOD) with cross-linking in the matrix of chitosan on an Au electrode by glutaraldehyde,a novel glucose biosensor was constructed with gold nanoparticles by electrodeposition.METHODS:The properties of CHIT/AuNPs hybrid film modified electrode were characterized by cyclic voltammetry (CV) in 20 mmol/L K3Fe (CN)6-0.1 mol/L KCI system by using the three-electrode system and the response to glucose was investigated by linear scan voltammetry (LSV).The optimal experiment conditions,stability and reproducibility about the glucose biosensor were also studied.MAIN OUTCOME MEASURES:The cyclic voltammetry properties of different modified electrode,as well as relation between glucose concentration and response current.RESULTS:Glucose concentration showed a linear correlation with response current in range of 0.001-6 mmol/L.The biosensor exhibited excellent performances of producibility,stability and the ignorance interferences of reducing substances,with the CONCLUSION:The glucose biosensor possesses excellent reproducibility and stability with a fast response time to glucose,which can be used in detection of glucose concentration in human serum.