Chemiluminescence behaviour of CdTe-potassium permanganate enhanced by sodium hexametaphosphate and sensitized sensing of L-ascorbic acid.
Chemiluminescence behaviour of CdTe-potassium permanganate enhanced by sodium hexametaphosphate and sensitized sensing of L-ascorbic acid.
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DOI：
10.1002/bio.1376
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Hongqi Chen;Bo Ling;Fei Yuan;Cailing Zhou;Jing-guo Chen;Lun Wang
中科院分区：
文献类型：
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作者：
Hongqi Chen;Bo Ling;Fei Yuan;Cailing Zhou;Jing-guo Chen;Lun Wang
基于CdTe纳米晶-高锰酸钾化学发光体系，建立了一种高灵敏的流动注射化学发光法测定L-抗坏血酸。研究发现，在近中性pH条件下，六偏磷酸钠（SP）可增强高锰酸钾氧化还原CdTe量子点的化学发光。L-抗坏血酸被认为是用于上述能量转移激发过程的敏感增强剂。在最佳条件下，L-抗坏血酸浓度在1.0 × 10 - 9 ~ 5.0 × 10 - 6 mol/L范围内与荧光强度呈良好的线性关系，在5.0 × 10 - 7 mol/L浓度下，相关系数为0.9969，相对标准偏差（RSD）为2.3%（n = 7）。该方法已成功地用于维生素C片中L-抗坏血酸的测定。并对该体系化学发光的可能机理进行了讨论。
A highly sensitive flow-injection chemiluminescence (FIA-CL) method based on the CdTe nanocrystals and potassium permanganate chemiluminescence system was developed for the determination of L-ascorbic acid. It was found that sodium hexametaphosphate (SP), as an enhancer, could increase the chemiluminescence (CL) emission from the redox reaction of CdTe quantum dots with potassium permanganate in near-neutral pH conditions. L-ascorbic acid is suggested as a sensitive enhancer for use in the above energy-transfer excitation process. Under optimal conditions, the calibration graph of emission intensity against logarithmic l-ascorbic acid concentration was linear in the range 1.0 × 10(-9)-5.0 × 10(-6) mol/L, with a correlation coefficient of 0.9969 and relative standard deviation (RSD) of 2.3% (n = 7) at 5.0 × 10(-7) mol/L. The method was successfully used to determine L-ascorbic acid in vitamin C tablets. The possible mechanism of the chemiluminescence in the system is also discussed.