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Salmonella typhimurium detection using a surface-enhanced Raman scattering-based aptasensor.

Abstract：

:Surface-enhanced Raman spectroscopy (SERS) has been used in a variety of biological applications due to its high sensitivity and specificity. Here, we report a SERS-based aptasensor approach for quantitative detection of pathogenic bacteria. A SERS substrate bearing Au@Ag core/shell nanoparticles (NPs) is functionalized with aptamer 1 (apt 1) for the capture of target molecules. X-rhodamine (ROX)-modified aptamer 2 (apt 2) is used as recognition element and Raman reporter. Salmonella typhimurium specifically interacted with the aptamers to form Au@Ag-apt 1-target-apt 2-ROX sandwich-like complexes. As a result, the concentration of S. typhimurium was determined using this developed aptasensor structure, and a calibration curve is obtained in the range of 15 to 1.5 × 10(6) cfu/mL with a limit of detection of 15 cfu/mL. Our method was successfully applied to real food samples, and the results are consistent with the results obtained using plate counting methods. We believe that the developed method shows potential for the rapid and sensitive detection of pathogenic bacteria in food safety assurance.

journal_name

Int J Food Microbiol

journal_title

International journal of food microbiology

authors

Duan N,Chang B,Zhang H,Wang Z,Wu S

doi

10.1016/j.ijfoodmicro.2015.11.006

subject

Has Abstract

pub_date

2016-02-02 00:00:00

pages

38-43

eissn

0168-1605

issn

1879-3460

pii

S0168-1605(15)30169-0

journal_volume

218

pub_type

杂志文章

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