荧光增强型量子点探针检测痕量谷氨酸脱氢酶

建立了荧光增强型量子点探针检测痕量谷氨酸脱氢酶(GLDH)的方法,GLDH是一种烟酰胺腺嘌呤二核苷酸(NAD+)依赖的酶分子,具有氧化性的NAD+通过电子转移淬灭CdTe量子点的荧光,而GLDH催化的生物化学反应可以消耗NAD+.在所采用的NAD+/GLDH体系中,量子点的荧光先被NAD+淬灭,加入GLDH消耗NAD+,荧光会因NAD+的减少而增强.利用这种高选择性的酶促反应可以检测浓度范围比较宽的GLDH(10~ 1000 U/L).对于这个浓度范围GLDH的检测在临床上有重要意义,可用于诊断不同类型的肝脏疾病....

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Published in分析化学 Vol. 42; no. 3; pp. 436 - 440
Main Author 杨敏 余涛 张忠平 王素华 蒋辉
Format Journal Article
LanguageChinese
Published 中国科学技术大学材料与化学学院,合肥230026%北京药物化学研究所国民核生化灾害防护重点实验室,北京,102205%中国科学院合肥智能机械研究所,合肥,230031 2014
中国科学院合肥智能机械研究所,合肥230031
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Summary:建立了荧光增强型量子点探针检测痕量谷氨酸脱氢酶(GLDH)的方法,GLDH是一种烟酰胺腺嘌呤二核苷酸(NAD+)依赖的酶分子,具有氧化性的NAD+通过电子转移淬灭CdTe量子点的荧光,而GLDH催化的生物化学反应可以消耗NAD+.在所采用的NAD+/GLDH体系中,量子点的荧光先被NAD+淬灭,加入GLDH消耗NAD+,荧光会因NAD+的减少而增强.利用这种高选择性的酶促反应可以检测浓度范围比较宽的GLDH(10~ 1000 U/L).对于这个浓度范围GLDH的检测在临床上有重要意义,可用于诊断不同类型的肝脏疾病.
Bibliography:YANG Min1'3, YU Tao2, ZHANG Zhong-PingI, WANG Su-Hua*''3, JIANG Hui ,2 ( Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China) 2(Beijing Institute of Pharmaceutical Chemistry, State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China) 3 ( Department of Chemistry, University of Science and Technology of China, Hefei 230026, China)
22-1125/O6
We reported a simple and fast fluorescence system based on quantum dots (QDs) to detect glutamate dehydrogenase (GLDH) , which inverted glutamate to α-ketogrutarate using NAD+ as a coenzyme. The fluorescence of CdTe QDs was quenched by nicotinamide adenine dimucleotide ( NAD+ ) through an electron transfer pathway, and the quencher NAD+ could be consumed by adding NAD+-dependent enzymes and corresponding substrates. Based on this principle we introduced GLDH to consume NAD+ in the QDs/ NAD+ system, leading to the enhancement of the fluorescence intensity of QDs, which was in proportional to the amounts of GLDH added. Using this
ISSN:0253-3820
DOI:10.3724/SP.J.1096.2014.30646