一种ESIPT“关-开”型Cys荧光探针的合成及应用
Synthesis and application of an ESIPT “off-on” cysteine fluorescent probe
以2-氨基苯硫酚和4-羟基苯甲醛为原料合成的2-(4-羟基苯基)苯并噻唑(4HBT)为荧光团,以丙烯酰氯为识别单元,设计并合成了一种ESIPT“关-开”型半胱氨酸(Cys)荧光探针4HBT-AC。通过 1H-NMR和 13C-NMR波谱对4HBT-AC进行了结构表征。吸收光谱实验结果表明,探针4HBT-AC溶液的最大吸收峰为302 nm,而加入Cys后,最大吸收峰变为318 nm;荧光光谱系列实验结果显示,在302 nm激发波长下,最大发射波长为380 nm,荧光强度增强约107倍;最适pH在7.0左右;响应时间为16 min;在0~60 μmol/L范围内,荧光强度与Cys浓度之间呈良好的线性关系,相关系数R2=0.991 1,检测限为 0.12 μmol/L;该探针对Cys的选择性和抗干扰能力强。通过HPLC分析检测反应过程确定了4HBT-AC与Cys的响应机理。用测试纸和薄层硅胶板对探针响应Cys的荧光分析进行了初步应用。
A novel ESIPT “off-on” cysteine fluorescent probe,4HBT-AC,is designed and synthesized through using 2-(4-hydroxyphenyl) benzothiazole (4HBT),which is synthesized through using 2-aminothiophenol and 4-hydroxybenzaldehyde as the fluorescent group,and acryloyl chloride as the recognition unit.Moreover,the structure of 4HBT-AC is characterized by means of 1H-NMR and 13C-NMR spectroscopy.The absorption spectrum experiment results indicate that the maximum absorption peak of 4HBT-AC solution is 302 nm,while it becomes 318 nm after cysteine is added into the solution.The results from fluorescence spectrum series experiments show that under an excitation wavelength of 302 nm,the maximum emission wavelength of 4HBT-AC is 380 nm,and its fluorescence intensity is enhanced by about 107 times.The optimal pH is around 7.0 and the response time is around 16 minutes.There exists a good linear relationship between fluorescence intensity and cysteine concentration within the range of 0-60 μmol/L,showing a correlation coefficient R2 of 0.991 1 and a detection limit of 0.12 μmol/L.This probe has a high selectivity for cysteine and a strong anti-interference ability.Furthermore,the response mechanism of 4HBT-AC to cysteine is clarified through analyzing the reaction process by HPLC.In addition,the fluorescence analysis on probe’s response to cysteine is preliminarily applied on test paper and thin-layer silica gel plate.
ESIPT / 丙烯酰氯 / 2-(4-羟基苯基)苯并噻唑 / 半胱氨酸 / 荧光探针
ESIPT / acryloyl chloride / 2-(4-hydroxyphenyl) benzothiazole / cysteine / fluorescent probe
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