Detection of Ascorbic Acid by Quantum Fluorescence Probe

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (3): 688.

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Detection of Ascorbic Acid by Quantum Fluorescence Probe

ZHANG Li-Pei, HU Bo, WANG Jian-Hua*

Research Center for Analytical Sciences, Northeastern University, Shenyang 110819, China

Received:2010-09-25 Revised:2010-10-25 Online:2011-03-10 Published:2011-02-23
Contact: Jianhua Wang E-mail:jianhuajrz@mail.neu.edu.cn
Supported by:
国家自然科学基金(批准号: 20805004)、国家杰出青年科学基金(批准号: 20725517)和中央高校基本科研业务费(批准号: N090105001, N090605001, N090405004, N100305003, N100305004, N100605002)资助.

Abstract

Abstract: CdTe quantum dots of highly fluorescent is prepared in aqueous solution with mercaptopropanoic acid (MPA) as stabilizer. The fluorescence of the CdTe QDs is significantly quenched with blue shift on the addition of Mn2+ due to the change of the surface structure and chemical properties of the QDs. The fluorescence recovery is afterwards achieved in the presence of a small amount of ascorbic acid. This provides a novel QD-based turn-on fluorescent probe for the detection of ascorbic acid. When using QDs of 1.91 nm in size and a concentration of 1.67 uM in the presence of 0.25 mM Mn2+, the recovered fluorescence is linearly related with the ascorbic acid concentration within 0.25-16 uM, with a correlation coefficient of 0.9980 and a detection limit of 36 nM. The probe has been applied for the detection of ascorbic acid in Vc tablets and human whole blood samples.

Key words: CdTe quantum dots, fluorescent probe, ascorbic acid

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ZHANG Li-Pei, HU Bo, WANG Jian-Hua*. Detection of Ascorbic Acid by Quantum Fluorescence Probe[J]. Chem. J. Chinese Universities, 2011, 32(3): 688.

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Detection of Ascorbic Acid by Quantum Fluorescence Probe

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