检出限
柠檬酸
水溶液
硫脲
四环素
土霉素
核化学
碳纤维
荧光
化学
材料科学
分析化学(期刊)
色谱法
物理
生物化学
抗生素
复合材料
有机化学
物理化学
复合数
量子力学
作者
Xuejian Xing,Li Huang,Shaojing Zhao,Jiangnan Xiao,Minhuan Lan
标识
DOI:10.1016/j.microc.2020.105065
摘要
S,N-doped carbon dots (S,N-CDs) were facilely prepared via a hydrothermal method by using thiourea and citric acid (CA) as precursors. The as-prepared S,N-CDs exhibited high stability in aqueous solution and were applied for fluorometric detection of tetracyclines (TCs). The approach was developed on the basic of the fluorescence of S,N-CDs at 440 nm, which was selectively quenched by TCs through the inner filter effect (IFE) mechanism. Moreover, the fluorescence of TCs with maximum at 600 nm could be used as the internal standard signal, resulting in a fluorometric spectral response. The limit of detection (LOD) was 0.25, 0.39 and 0.26 μM for tetracycline (TC), doxycycline (DC) and oxytetracycline (OTC), respectively. Furthermore, S,N-CDs were successfully utilized for the detection of residual TCs in fish and pork samples with acceptable recovery and good RSD.
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