用水溶液中合成的量子点作为生物荧光标记物的研究  

Studies on Quantum Dots Synthesized in Aqueous Solution for Biological Labeling

作　　者：林章碧[1] 苏星光[1] 张皓[2] 牟颖[3] 孙晔[3] 胡海[1] 杨柏[2] 闫岗林[3] 罗贵民[3] 金钦汉[1] 

机构地区：[1]吉林大学化学学院分析科学研究所,长春分析仪器研究和技术开发中心 [2]吉林大学超分子结构与材料重点实验室 [3]吉林大学分子酶学工程教育部重点实验室,长春130023

出　　处：《高等学校化学学报》2003年第2期216-220,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 0 75 0 0 9)资助

摘　　要：以巯基丙酸 ( HS— CH2 CH2 COOH)为稳定剂 ,在水溶液中合成了具有窄而对称 ( FWHM=4 0 nm)的荧光发射带且尺寸为 3nm的 Cd Te半导体纳米粒子 ,并用此纳米粒子成功地标记了生物分子胰蛋白酶 .与单独的 Cd Te纳米粒子的溶液相比较 ,Cd Te-胰蛋白酶溶液的吸收光谱在 4 0 0～ 6 0 0 nm范围内较为平坦 ,其发射光谱蓝移 8nm,但发射峰的半峰宽不变 .实验证明 ,Cd Te-胰蛋白酶溶液吸收和发射光谱的变化是由Cd Te纳米粒子与胰蛋白酶之间的结合反应引起的 ,而不是由空气中的 O2 所引起的 ,加热可促进 Cd Te纳米粒子与胰蛋白酶之间的结合反应 .CdTe semiconductor nanoparticles were synthesized in aqueous solution by using mercaptopropyl acid(HS-CH 2CH 2COOH) as the stabilizer. The nanocrystals exhibit a strong, stable and narrow band luminescence(FWHM=40 nm). The average size estimated from TEM graph is ca. 3 nm. The applicability of the resulting mercaptopropyl acid modified CdTe nanoparticles to the labeling of biomoleculestrypsin was studied in this paper. The absorption spectrum of CdTe-trypsin solution was flatter than that of CdTe nanoparticles over the wavelength range of 400 to 600 nm. While the emission spectrum of CdTe-trypsin solution shows a blue-shift in the emission peak, the intrinsic emission band width is unchanged. It was proved that the shift of the emission peak was the result of the conjugation between CdTe nanoparticles and trypsin, but not of the oxidation caused by O 2. Furthermore, heating could accelerate the speed of conjugation between CdTe nanoparticles and trypsin.

关 键 词：生物荧光标记物 量子点 胰蛋白酶 荧光分析 半导体纳米粒子 碲化镉 生物分子 

分 类 号：Q556.9[生物学—生物化学]