基于量子点/抗体探针采用电化学方法检测水中微囊藻毒素
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Determination of Microcystin in Water Using Electrochemical Method Based on Quantum Dot/Antibody Probe
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    用量子点偶联微囊藻毒素抗体作为探针,经过间接竞争反应之后,通过方波溶出伏安法测定Cd2+的浓度,从而实现对水中微囊藻毒素含量的检测。分别对缓冲液pH、浓度、沉积电位、沉积时间等因素进行优化。实验结果表明:Cd2+在-0.768 V左右会出现一个灵敏的溶出峰,在最优实验条件下进行检测,峰电流值与微囊藻毒素浓度的对数值在一定范围内呈良好的线性关系,线性范围在0.1~8 μg/L之间,线性方程为y=-196.66x+242.15,相关系数R2=0.992 45,检出限为0.08 ?滋g/L,加标回收率为91.0%~108.6%,相对标准偏差为2.97%~6.98%。

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    With the probe of quantum dots coupled with microcystin antibody(QDs-Ab),the content of microcystin was determined by measuring cadmium ions released from QDs based on square wave stripping voltammetry after indirect competitive reaction. The electrochemical response was optimized with respect to pH,buffer concentration,deposition potential,deposition time and so on. Results showed that the sensitive stripping peak potential of cadmium ions was about -0.768 V. Under the optimal conditions,the peak current was linear with the logarithm of microcystin concentration in the range of 0.1~8 μg/L and the equation of regression was y=-196.66x+242.15(R2=0.994 8) with a detection limit of 0.08×10-9. The recovery of standard addition experiment was in the range of 91%~108.6% with the relative standard deviation of 2.97%~6.98%.

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李莹,孙秀兰,张银志.基于量子点/抗体探针采用电化学方法检测水中微囊藻毒素[J].食品与生物技术学报,2017,36(2):136-142.

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  • 在线发布日期: 2017-04-28

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