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2015 ; 15
(8
): 19212-24
Nephropedia Template TP
gab.com Text
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English Wikipedia
Electrochemical Impedance Immunosensor Based on Self-Assembled Monolayers for
Rapid Detection of Escherichia coli O157:H7 with Signal Amplification Using
Lectin
#MMPMID26251911
Li Z
; Fu Y
; Fang W
; Li Y
Sensors (Basel)
2015[Aug]; 15
(8
): 19212-24
PMID26251911
show ga
Escherichia coli O157:H7 is a predominant foodborne pathogen with severe
pathogenicity, leading to increasing attention given to rapid and sensitive
detection. Herein, we propose an impedance biosensor using new kinds of
screen-printed interdigitated microelectrodes (SPIMs) and wheat germ agglutinin
(WGA) for signal amplification to detect E. coli O157:H7 with high sensitivity
and time-efficiency. The SPIMs integrate the high sensitivity and short response
time of the interdigitated electrodes and the low cost of the screen-printed
electrodes. Self-assembling of bi-functional
3-dithiobis-(sulfosuccinimidyl-propionate) (DTSP) on the SPIMs was investigated
and was proved to be able to improve adsorption quantity and stability of
biomaterials. WGA was further adopted to enhance the signal taking advantage of
the abundant lectin-binding sites on the bacteria surface. The immunosensor
exhibited a detection limit of 102 cfu·mL(-1), with a linear detection range from
10(2) to 10(7) cfu·mL(-1) (r2 = 0.98). The total detection time was less than 1
h, showing its comparable sensitivity and rapid response. Furthermore, the low
cost of one SPIM significantly reduced the detection cost of the biosensor. The
biosensor may have great promise in food safety analysis and lead to a portable
biosensing system for routine monitoring of foodborne pathogens.