Carbon dots derived from Poria cocos polysaccharide as an effective"on-off"fluorescence sensor for chromium(Ⅵ)detection

• 作者: Qianqian Huang Qianqian Bao Chengyuan Wu Mengru Hu Yunna Chen Lei Wang Weidong Chen
• 来源期刊: 药物分析学报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Original Articles
• 页码范围: 104-112
• 页数: 9页
• 语种: 英文

摘要

Chromium is a harmful contaminant showing mutagenicity and carcinogenicity.Therefore,detection of chromium requires the development of low-cost and high-sensitivity sensors.Herein,blue-fluorescent carbon quantum dots were synthesized by one-step hydrothermal method from alkali-soluble Poria cocos polysaccharide,which is green source,cheap and easy to obtain,and has no pharmacological ac-tivity due to low water solubility.These carbon quantum dots exhibit good fluorescence stability,water solubility,anti-interference and low cytotoxicity,and can be specifically combined with the detection of Cr(Ⅵ)to form a non-fluorescent complex that causes fluorescence quenching,so they can be used as a label-free nanosensor.High-sensitivity detection of Cr(Ⅵ)was achieved through internal filtering and static quenching effects.The fluorescence quenching degree of carbon dots fluorescent probe showed a good linear relationship with Cr(Ⅵ)concentration in the range of 1-100 μM.The linear equation was F0/F=0.9942+0.01472[Cr(Ⅵ)](R2=0.9922),and the detection limit can be as low as 0.25 μM(S/N=3),which has been successfully applied to Cr(Ⅵ)detection in actual water samples herein.