Point-of-Care Detection of β-Lactamase in Milk with a Universal Fluorogenic Probe

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• 作者：Yiping Chen ; Yunlei Xianyu ; Jing Wu ; Wenfu Zheng ; Jianghong Rao ; Xingyu Jiang
• 刊名：Analytical Chemistry
• 出版年：2016
• 出版时间：June 7, 2016
• 年：2016
• 卷：88
• 期：11
• 页码：5605-5609
• 全文大小：314K
• 年卷期：0
• ISSN：1520-6882

文摘

The illegal addition of β-lactamase (Bla) in milk to disguise β-lactam antibiotics has been a serious issue in the milk industry worldwide. Herein, we report a method for point-of-care detection of Bla based on a probe, Tokyo Green-tethered β-lactam (CDG-1), as a common substrate of various Blas (Bla A, B...) which can enzymatically convert CDG-1 (low fluorescence) to Tokyo Green (high fluorescence). This approach allows rapid screening of a broad spectrum of Blas in real milk samples within 15 min without any pretreatment. Combined with the immuno-magnetic separation, we achieved sensitive and quantitative detection of Bla (10^–5 U/mL), which provides a universal platform for screening and determining Blas in complex samples with high efficiency and accuracy.