期刊
BIOSENSORS & BIOELECTRONICS
卷 151, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2019.111914
关键词
Bacteriophage; Orientation; Electric field; Debye length; Differential Pulse Voltammetry; Viability; T4B-MES
类别
资金
- Hong Kong Research Grants Council [16205314]
- Guangzhou Science, Technology and Innovation Commission [201704030101]
- Guangdong Science and Technology Grant [2017B050506001]
In this work, a wild-type T4 bacteriophage based micro electrochemical sensor (T4B-MES) was developed for specific and sensitive detection of viable pathogenic bacteria. Recently, bacteriophage has been widely applied as recognition elements for bacteria detection due to its low cost, high stability and specificity. Firstly, a systematic study was proposed in this paper to investigate the synergy of externally applied electric field and chemical functionalization on phage immobilization, involving several key factors such as Debye length. According to our experiments, the capture efficiency of the deposited phages had reached the maximum when the Debye length was comparable to the phage size. With the optimized immobilization protocol, the sensitivity of the T4B-MES was then determined with Differential Pulse Voltammetry (DPV), providing a quite low detection limit of 14 +/- 5 cfu/mL and a wide dynamic range of 1.9 x 10(1)-1.9 x 10(8) cfu/mL. In addition, the T4B-MES demonstrated the ability to distinguish viable and dead bacteria cells with high specificity, making it a promising solution in a variety of applications, e.g., water quality monitoring.
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