机构地区: 淮北煤炭师范学院化学与材料科学学院
出 处: 《光谱学与光谱分析》 2006年第7期1318-1321,共4页
摘 要: 利用胶体化学方法合成和表征了功能性L-半胱氨酸包覆的ZnS纳米粒子。在pH 5.12的NaAc-HAc水溶液介质中,当Δλ=190 nm时L-半胱氨酸包覆ZnS纳米粒子于268.0 nm处出现同步荧光峰。一定量蛋白质的加入能明显增强体系的荧光强度,并且峰强度增加值与蛋白质浓度间存在良好的线性关系,据此建立了一种高灵敏度的测定微量蛋白质的方法。用L-半胱氨酸包覆ZnS纳米粒子作为探针,不仅克服了有机染料可能出现的光漂白等缺点,而且本身不具毒性。将该法用于人血清试样中总蛋白的测定,其结果与临床数据一致。 Nanometer-sized L-cysteine-capped ZnS particles as a fluorescence probe were synthesized, and the effect of proteins on the fluorescence intensity has been investigated. With △λ=190nm, the maximum and constant synchronous fluorescence enhancement was produced at 268.0 nm and pH 5.12 in the presence of proteins. A highly sensitive synchronous fluorescence method for the rapid determination of proteins was developed. Under optimum conditions, the calibration curve was linear over the range 0. 05-6. 0μg · mL^-1 for human serum albumin (HSA), and 0. 05-8. 0 μg · mL^-1 for γ-globulin(γ-G), respectively. The relative standard deviations of seven measurements were 1.90% for 1.0μg · mL^-1 HSA, and 1.65% for 1.0μg · mL^-1 γ-G.