摘要
以油菜籽和水为原料,一步合成了强荧光碳量子点(CQDs)。基于KMnO_4能使该CQDs的荧光显著猝灭;而当有盐酸米诺环素(MINO)存在时,CQDs-KMnO_4体系的荧光恢复,使荧光信号重新"打开"的原理,提出了以油菜籽CQDs荧光信号的"关开"为荧光探针测定盐酸米诺环素的新方法。方法的线性范围为5.0×10~(-7)~1.0×10~(-5) mol/L,相关系数r=0.999 5,方法检出限为4.9×10~(-7) mol/L。方法用于样品中盐酸米诺环素的测定,回收率为99.6%~100%。通过紫外-可见吸收光谱的变化和荧光寿命的测定,确定CQDs与KMnO_4间的猝灭类型为动态猝灭。同时对体系的"关-开"机理进行了初步探讨。
In this paper,a new fluorescent carbon quantum dots(CQDs)were synthesized by one-step method using rapeseed and water as raw material.The experiments showed that potassium permanganate(KMnO_4)could effectively quench the fluorescence of the CQDs.However,the fluorescence of CQDs-KMnO_4 system restored reversibly in the presence of minocycline hydrochloride.Based on this principle,a new method was proposed for the determination of minocycline hydrochloride with the"off-on"fluorescence signal of rapeseed CQDs as a fluorescent probe.Under the optimum conditions,the linear range of the method was 5.0×10~(-7) mol/L to 1.0×10~(-5) mol/L with a correlation coefficient of 0.999 5 and a detection limit of 4.9×10~(-7) mol/L.The method was used in the determination of minocycline hydrochloride in samples with a recovery of 99.6%-100%.The mechanisms for CQDs fluorescence quenched by KMnO_4 and recovered by minocycline hydrochloride were studied.
引文
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