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Covalent Immobilization Of Pseudomonas Cepacia Lipase On Semiconducting Materials

机译:假单胞菌洋葱脂酶在半导体材料上的共价固定

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Lipase from Pseudomonas cepacia was covalently immobilized on crystalline silicon, porous silicon and silicon nitride surfaces. The various stages of immobilization were characterized using FTIR (Fourier transform infrared) spectroscopy. The surface topography of the enzyme immobilized surfaces was investigated using scanning electron microscopy (SEM). The quantity of the immobilized active enzyme was estimated by the para-nitrophenyl palmitate (pNPP) assay. The immobilized lipase was used for triglyceride hydrolysis and the acid produced was detected by a pH sensitive silicon nitride surface as a shift in the C-V (capacitance-voltage) characteristics of an electrolyte-insulator-semiconductor capacitor (EISCAP) thus validating the immobilization method for use as a biosensor.
机译:来自洋葱假单胞菌的脂肪酶被共价固定在晶体硅,多孔硅和氮化硅表面上。使用FTIR(傅立叶变换红外)光谱对固定的各个阶段进行了表征。使用扫描电子显微镜(SEM)研究了固定酶表面的表面形貌。固定的活性酶的量通过对硝基苯基棕榈酸酯(pNPP)测定来估计。固定化的脂肪酶用于甘油三酸酯的水解,通过pH敏感的氮化硅表面检测到产生的酸,作为电解质-绝缘体-半导体电容器(EISCAP)的CV(电容-电压)特性的变化,从而验证了固定化脂肪酶的方法用作生物传感器。

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