基于多巴胺官能化碳点对Cr(VI)和酪氨酸酶的检测研究
首发时间:2019-05-20
摘要:酪氨酸酶是影响黑色素合成的多酚氧化酶,而Cr(VI)则是一种剧毒的强氧化性重金属离子。基于二者氧化特性,我们以柠檬酸和多巴胺为原料,合成表面富含邻苯二酚官能团的碳点(DA-CQDs)。酪氨酸酶能特异性与邻苯二酚反应使其生成邻苯二醌,而醌产物能与DA-CQDs发生有效的能量转移,导致DA-CQDs发生荧光猝灭。重金属Cr(VI)则通过自身的强氧化性高效地氧化DA-CQDs表面,使DA-CQDs荧光猝灭。因此,利用该DA-CQDs的特征,我们建立了一种对酪氨酸酶和Cr(VI)灵敏检测的实验方法,检测限分别低至0.015 U/mL和52.9 nM。
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Detection of Cr(VI)and tyrosinase by dopamine functionalized carbon dots
Abstract:Tyrosinase is a polyphenol oxidase that affects melanin synthesis, and Cr(VI) is a highly toxic heavy metal ion with oxidation property. Upon their oxidation properties, this section employed citric acid and dopamine as raw materials to synthesize catechol-rich carbon dots (DA-CQDs). Tyrosinase can specifically react with catechol to form O-benzoquinone. Meanwhile, the quinone products can effectively quench the DA-CQDs fluorescence by transfer energy. As for Cr(VI), due to its strong oxidizing property, it can also passivate the DA-CQDs surface and quench the fluorescence. Therefore, we explore a rapid method for sensitive detection of tyrosinase and Cr(VI) using catechol-rich DA-CQDs, and LOD as low as 0.015 U/mL and 52.9 nM, respectively.
Keywords: Analtical chemistery Carbon dots Tryosinase Cr(VI)
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基于多巴胺官能化碳点对Cr(VI)和酪氨酸酶的检测研究
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