http://scholars.ntou.edu.tw/handle/123456789/21372
標題: | Carbon dots with polarity-tunable characteristics for the selective detection of sodium copper chlorophyllin and copper ions | 作者: | Lin, Yu-Syuan Yang, Zong-Yu Anand, Anisha Huang, Chih-Ching Chang, Huan-Tsung |
關鍵字: | Carbon dots;Chemical oxidation;Sensing;Copper;Surface ligands;Coordination | 公開日期: | 25-一月-2022 | 出版社: | ELSEVIER | 卷: | 1191 | 來源出版物: | ANALYTICA CHIMICA ACTA | 摘要: | Compared to water-soluble carbon dots (CDs) the properties and applications of hydrophobic CDs are rarely addressed. In this study, a one-pot, simple chemical oxidation approach has been applied to synthesize hydrophobic carbon dots (TO-CDs) at room temperature from triolein (TO) in concentrated sulfuric acid solution. Sodium copper chlorophyllin (SCC) quenches the fluorescence of TO-CDs by a photoinduced electron transfer process. Upon excitation at 400 nm, the fluorescence intensity of TO-CDs probe at 500 nm shows a linear response against the SCC concentration ranging from 1.0 to 10 mu M, with a limit of detection (LOD) of 0.61 mu M. Quantitation of SCC in flavored drinks shows percentage recovery (% R) vaues of 98-103% and relative standard deviation (RSD) values less than 6.5%. The hydrophobic TOCDs can be converted into hydrophilic TO-CDs through hydrolysis in NaOH solution. The presence of sulfonyl groups on the hydrophilic TO-CDs enhances the coordination ability of the CDs toward Cu2+ ions, leading to fluorescence quenching which allows for the detection of Cu2+ ions with LOD of 0.21 mu M and a linear range of 0.5-10 mu M. The hydrophilic TO-CD probe possesses high selectivity toward Cu2+ ions (tolerance at least ten-fold comparative to other metal ions). The assay has been validated with the analysis of spiked soil samples, with %R values of Cu concentration of 97.8-99.0% and RSDs below 2.0%. The surface tunable CD probes demonstrate their potential for the rapid screening of Cu2+ ions in environmental samples and SCC in foods. (C) 2021 Elsevier B.V. All rights reserved. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/21372 | ISSN: | 0003-2670 | DOI: | 10.1016/j.aca.2021.339311 |
顯示於: | 生命科學暨生物科技學系 |
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