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- W1978753321 abstract "Abstract Although quantum dot (QD)‐based room temperature phosphorescence (RTP) probes are promising for practical applications in complex matrixes such as environmental, food and biological samples, current QD‐based‐RTP probes are not only quite limited but also exclusively based on the RTP quenching mechanism. Here we report an ascorbic acid (AA) induced phosphorescence enhancement of sodium tripolyphosphate‐capped Mn‐doped ZnS QDs, and its application for turn‐on RTP detection. The chelating ability allows AA to extract the Mn and Zn from the surface of the QDs and to generate more holes which are subsequently trapped by Mn 2+ , while the reducing property permits AA to reduce Mn 3+ to Mn 2+ in the excited state, thereby enhancing the excitation and orange emission of the QDs. The enhanced RTP intensity of the QDs increases linearly with the concentration of AA in the range of 0.05–0.8 μ M . Thus, a QD‐based RTP probe for AA is developed. The proposed QD‐based turn‐on RTP probe avoids tedious sample pretreatment, and offers good sensitivity and selectivity for AA in the presence of the main relevant metal ions and other molecules in biological fluids. The limit of detection (3 s ) of the developed method is 9 n M AA, and the relative standard deviation is 4.8 % for 11 replicate detections of 0.1 μ M AA. The developed method is successfully applied to the analysis of real samples of human urine and plasma for AA with quantitative recoveries from 96 to 105 %." @default.
- W1978753321 created "2016-06-24" @default.
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- W1978753321 date "2010-09-23" @default.
- W1978753321 modified "2023-10-18" @default.
- W1978753321 title "Ascorbic Acid Induced Enhancement of Room Temperature Phosphorescence of Sodium Tripolyphosphate-Capped Mn-Doped ZnS Quantum Dots: Mechanism and Bioprobe Applications" @default.
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- W1978753321 doi "https://doi.org/10.1002/chem.201001093" @default.
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