Highly selective and sensitive fluorescent sensing of N-acetylcysteine: Effective discrimination of N-acetylcysteine from cysteine
作者:Weihua Dong、Hui Wen、Xiao-Feng Yang、Hua Li
DOI:10.1016/j.dyepig.2012.10.014
日期:2013.3
it gives only a dim response at the same reaction conditions. The significant difference in reaction rates can be explained via the fact that NAC shows more hydrophobicity than Cys, therefore the Meisenheimer complex intermediate (2a) of its nucleophilic aromatic substitution with 1 can embed in CTAB micelles effectively, which will facilitate the formation of 2a and hence affords an acceleration of
提出了一种高选择性荧光探针,可有效区分N-乙酰半胱氨酸(NAC)和半胱氨酸(Cys)。探针1包含N,N-二乙基铑(DER)染料和二硝基苯基醚部分。与十六烷基三甲基溴化铵(CTAB)胶束水溶液中的NAC混合后,NAC将1硫解,释放出DER,从而显着增加了荧光发射。而对于Cys,在相同的反应条件下它仅给出暗淡的响应。NAC的疏水性高于Cys,因此其亲核芳香取代基为1的Meisenheimer复杂中间体(2a)可以解释反应速率的显着差异。可以有效地将其嵌入CTAB胶束中,这将促进2a的形成,从而加快反应速度。拟议的方法显示出NAC优于Cys,高半胱氨酸(Hcy)和其他氨基酸的选择性。