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《Chinese Journal of Analysis Laboratory》 2008-10
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Studies on fluorescence quenching method for determination of apigenin with CdSe/CdS quantum dots

TIAN Jian-niao,WEI Sheng-zhi,ZHAO Yan-chun and ZHAO Shu-lin(College of Chemistry and Chemical Engineering of Guangxi Normal University,Guilin 541004)  
The CdSe/CdS quantum dots of peculiar spectral properties were synthesized in an aqueous solution using thioglycolic acid as a stabilizing agent.Based on the fluorescence quenching of CdSe/CdS quantum dots by apigenin,a sensitive and specific method for apigenin determination was proposed.Different influencing factors were studied,including pH and concentration of buffer,reaction time and quantum dot concentration.In 0.001 mol/L KH2PO4-Na2HPO4 with pH 6.80,when the concentration of quantum dots was 1.2×10-4 mol/L and the reaction time was 20 min,the relative fluorescence intensity is linearly proportional to the concentration of apigenin from 0.16 μg/mL to 27.02 μg/mL.The linear equation is F0/F=0.99665+0.11067ρ(μg/mL) with an excellent correlation coefficient of 0.998,and the limit of detection is 0.13 μg/mL for apigenin.The proposed method was used to the analysis of sythesized samples.
【Fund】: 广西应用基础研究专项(0639028);; 广西师范大学重点(师政科技2005第1号)项目资助
【CateGory Index】: R927
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