Tuning interionic interaction by rationally controlling solution pH for highly selective colorimetric sensing of arginine

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• 作者：Qin Qian ; Jie Hao ; Wenjie Ma ; Ping Yu ; Lanqun Mao
• 关键词：Arginine ; Gold nanoparticles ; Interionic interaction ; In vivo analysis
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：408
• 期：11
• 页码：3005-3012
• 全文大小：1,123 KB
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• 作者单位：Qin Qian (1)
  Jie Hao (1)
  Wenjie Ma (1)
  Ping Yu (1)
  Lanqun Mao (1)
  
  1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences (CAS), Beijing, 100190, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Food Science
  Inorganic Chemistry
  Physical Chemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-2650

文摘

Direct selective sensing of arginine in central nervous systems remains very essential to understanding of the molecular basis of some physiological events. This study presents the first demonstration on a simple yet effective method for arginine sensing with gold nanoparticles (Au-NPs) as the signal readout. The rationale for the method is based on the pH-dependent feature of the interionic interaction between cysteine and arginine. At pH 6.0, cysteine can only interact with arginine through the ion-pair interaction and such interaction can lead to the changes in both the solution color and UV-vis spectrum of the cysteine-protected Au-NPs upon the addition of arginine. These changes are further developed into an analytical strategy for effective sensing of arginine by rationally controlling the pH values of Au-NP dispersions with the ratio of the absorbance at 650 nm (A ₆₅₀) to that at 520 nm (A ₅₂₀) (A ₆₅₀/A ₅₂₀) as a parameter for analysis. The method is responsive to arginine without the interference from other species in the cerebral system; under the optimized conditions, the A ₆₅₀/A ₅₂₀ values are linear with the concentration of arginine within a concentration range from 0.80 to 64 μM, yet remain unchanged with the addition of other kinds of amino acids or the species in the central nervous system into the Au-NPs dispersion containing cysteine. The method demonstrated here is reliable and robust and could thus be used for detection of the increase of arginine in central nervous systems.