Ratiometric colorimetric determination of coenzyme A using gold nanoparticles and a binuclear uranyl complex as optical probes

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• 作者：Rurong Wu ; Lifu Liao ; Shijun Li ; Yanyan Yang ; Xilin Xiao…
• 关键词：Sulfosalophen ; Aggregation ; Phosphate binding ; Organophosphates ; Nanomaterials ; Dynamic light scattering ; Transmission electron microscopy
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：183
• 期：2
• 页码：715-721
• 全文大小：1,150 KB
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• 作者单位：Rurong Wu (1)
  Lifu Liao (1)
  Shijun Li (1)
  Yanyan Yang (1)
  Xilin Xiao (1)
  Changming Nie (1)
  
  1. College of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, 421001, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

We describe a ratiometric colorimetric method for the determination of coenzyme A (CoA) by using gold nanoparticles (AuNPs) and bis-uranyl-bis-sulfosalophen (BUBSS) as optical probes. BUBSS is a binuclear uranyl complex and formed through the chelating reaction of two uranyl ions with bis-sulfosalophen. CoA is captured by the AuNPs via the thiol group and this leads to the formation of CoA-AuNPs. In a second step, BUBSS binds two CoA-AuNPs through a coordination reaction between the uranyl ions in BUBSS and the phosphate groups in CoA-AuNPs. This causes the CoA-AuNPs to aggregate and results in a color change from wine red to blue. A ratiometric colorimetric assay was established for CoA based on the ratiometric measurement of absorbance changes at 650 and 525 nm. Their ratio is linearly related to the concentration of CoA in the 0 to 1.2 μmol⋅L-1 range, with a 6 nmol⋅L-1 detection limit under optimal conditions. The method was successfully applied to the determination of CoA in spiked liver samples with recoveries between 99.4 and 102.6 %.