Luminescent CdSe-ZnS quantum dots as selective Cu2+ probe |
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| Affiliation: | 1. School of Environment and Natural Resource, Renmin University of China, 100872 Beijing, China;2. Research Institute of Chemical Defense, Academy of Military Sciences PLA China, Beijing 102205, China;3. State Key Laboratory of NBC Protection FOR Civilian, Beijing 102205, China;1. Functional Crystallization Center (ERC), Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea;2. Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea;1. Key Laboratory on Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China;2. College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China |
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| Abstract: | Luminescent CdSe-ZnS quantum dots (QDs) were modified with bovine serum albumin (BSA) and used as selective copper ion probe. The fluorescence of the water-soluble QDs can be quenched only by Cu2+ and Fe3+ in physiological buffer solution. Approximate concentrations of other physiologically important cations, such as Zn2+, Na+ and K+ etc. have no effect on the fluorescence. Adding F− to form the colorless complex FeF63− can eliminate the interference of Fe3+. The detection limit of Cu2+ ions was 10 nM. The results can be explained in terms of strong binding of Cu2+ onto the surface of CdSe resulting in a chemical displacement of Cd2+ ions and the formation of CuSe on the surface of the QDs. |
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