Colorimetric determination of neomycin using melamine modified gold nanoparticles

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• 作者：Can Xiao ; Junfeng Liu ; Ankang Yang ; Hong Zhao ; Yujian He ; Xiangjun Li…
• 关键词：Melamine ; Gold nanoparticles ; Neomycin ; Colorimetric detection
• 刊名：Microchimica Acta
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：182
• 期：7-8
• 页码：1501-1507
• 全文大小：1,509 KB
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• 作者单位：Can Xiao (1)
  Junfeng Liu (1)
  Ankang Yang (1)
  Hong Zhao (1)
  Yujian He (1)
  Xiangjun Li (1)
  Zhuobin Yuan (1)
  
  1. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, 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

The colorimetric assay for neomycin presented here is based on melamine-modified gold nanoparticles (mel-AuNPs) and the finding that hydrogen bonding between melamine and neomycin results in the aggregation of mel-AuNPs. This results in a change in the color of the solution from wine red to blue and in a red-shift of the absorption maximum of the mel-AuNPs. The concentration of neomycin can be determined by spectrophotometry. The ratio of absorptions at 680?nm and 520?nm is linearly related to the logarithm of the concentration of neomycin in the 0.1 to 5.0 nM range and in the 5 to 100 nM range, with regression coefficients of 0.997 and 0.999, respectively. The detection limit (at an S/N ratio of 3) is 30 pM. This is far below the usual safety limit. The method was applied to the detection of trace levels of neomycin in milk samples and gave recoveries between 98 and 105?%.