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首页> 外文期刊>Chemistry: A European journal >Intriguing Manipulation of Metal-Enhanced Fluorescence for the Detection of Cu~(II) and Cysteine
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Intriguing Manipulation of Metal-Enhanced Fluorescence for the Detection of Cu~(II) and Cysteine

机译：有趣的金属增强荧光检测铜〜（II）和半胱氨酸

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摘要

Commercially available salicylaldehyde, in alkaline medium, exhibits strong fluorescence after one hour of UV exposure in the presence of AgI. The phenolic group of salicylaldehyde is converted into the quinone form under alkaline conditions in the presence of AgNO_3, resulting in aggregated Ag(0), which causes approximately 250 times fluorescence enhancement of the in situ produced quinone. Such high silver-enhanced-fluorescence (SEF) is selectively quenched by cysteine, arginine, histidine, methionine, and tryptophan. In contrast to the other amino acids, ageing brings selectivity of the cysteine-induced quenching effect. Interestingly, Cu~(II) is found to be the only metal ion that exclusively regenerates the lost fluorescence. Thus, quenching and recovery of fluorescence (Turn Off/On) can be used for the selective and sensitive detection of cysteine as well as Cu~(II) ions in one pot. Alteration of the electric field density around the fluorophore (lightening rod effect) and scattering/absorption cross-section have been proposed to account for the Off/On fluorescence.
机译：在碱性介质中，可商购的水杨醛在AgI存在下暴露于紫外线一小时后会显示出强荧光。在碱性条件下，在存在AgNO_3的情况下，水杨醛的酚基转化为醌形式，导致聚集的Ag（0），引起原位生成的醌的荧光增强约250倍。这样的高银增强荧光（SEF）被半胱氨酸，精氨酸，组氨酸，蛋氨酸和色氨酸选择性淬灭。与其他氨基酸相反，老化带来了半胱氨酸诱导的猝灭作用的选择性。有趣的是，发现Cu〜（II）是唯一专门再生丢失的荧光的金属离子。因此，荧光的猝灭和恢复（关闭/打开）可用于在一罐中选择性和灵敏地检测半胱氨酸以及Cu〜（II）离子。已经提出了改变荧光团周围的电场密度（避雷针效应）和散射/吸收截面来解决关闭/开启荧光的问题。

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