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You X, Zhang G, Chen Y, Liu D, Ma D, Zhou J, Liu Y, Liu H, Qi Y, Liang C, Ding P, Zhu X, Zhang C, Wang A. A novel electrochemical immunosensor for the sensitive detection of tiamulin based on staphylococcal protein A and silver nanoparticle-graphene oxide nanocomposites. Bioelectrochemistry 2021; 141:107877. [PMID: 34171508 DOI: 10.1016/j.bioelechem.2021.107877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/29/2021] [Accepted: 06/13/2021] [Indexed: 12/17/2022]
Abstract
Tiamulin (TML) is a pleuromutilin antibiotic and mainly used to treat pulmonary and gastrointestinal infections. However, excessive use of TML can bring health threats to consumers. In this work, a label-free electrochemical immunosensor was proposed for sensitive detection of TML in pork and pork liver. Silver nanoparticles (AgNPs) were synthesized in situ on graphene oxide (GO), in which GO acted as a carrier for loading more AgNPs and AgNPs exhibited both strong conductivity and good redox property. In addition, staphylococcal protein A (SPA) was applied to oriented immobilization of fragment crystallizable (Fc) region of the TML monoclonal antibody. Under the optimal condition, the developed electrochemical immunosensor exhibited a good linear response with a concentration of TML ranging from 0.05 ng mL-1 to 100 ng mL-1 and the limit of detection (LOD) was 0.04 ng mL-1. Furthermore, the designed immunosensor was applied to detect TML in real samples with a good accuracy. Therefore, the label-free electrochemical immunosensor could be used as a potential method to detect TML and other antibiotic residues in animal derived foods.
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Affiliation(s)
- Xiaojuan You
- School of Life Sciences, Zhengzhou University, Zhengzhou, China; Henan Zhongze Biological Engineering Co. LTD, Zhengzhou, China
| | - Gaiping Zhang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Yumei Chen
- School of Life Sciences, Zhengzhou University, Zhengzhou, China; Henan Zhongze Biological Engineering Co. LTD, Zhengzhou, China
| | - Dan Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Dongdong Ma
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Jingming Zhou
- School of Life Sciences, Zhengzhou University, Zhengzhou, China; Henan Zhongze Biological Engineering Co. LTD, Zhengzhou, China
| | - Yankai Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Hongliang Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Yanhua Qi
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Chao Liang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Peiyang Ding
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Xifang Zhu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Chenyang Zhang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Aiping Wang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China; Henan Zhongze Biological Engineering Co. LTD, Zhengzhou, China.
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