Abstract
Photothermal effect of nanomaterial has been applied to the establishment of rapid detection method such as test strip. Previously, the detector for the photothermal test strip method mainly was a bulky thermal imaging camera or an infrared-sensing temperature sensor of which the detection data obtained is unstable due to its susceptibility to environmental changes. Herein, a resistive temperature sensor which is more stable and less susceptible to external environment was adopted. A test strip was used to detect Salmonella enterica Typhimurium (Salmonella typhimurium). The carboxylated graphene oxides (GOs), which have a more excellent photothermal effect, labeled with anti-Salmonella typhimurium antibodies, were used as a nanomarker to produce thermal signal. Subsequently, temperature variation signal (ΔT) generated by carboxylated GOs exposed to 808 nm laser was detected by conventional resistive temperature sensor directly. Under optimal conditions, a standard curve of ΔT with respect to the different numbers of Salmonella typhimurium was established, the detection limit was 104 CFU·mL-1 and the detection time was 20 min. The proposed detection method with high sensitivity, specificity, and efficiency can be used as a novel and on-site screening technology to detect Salmonella typhimurium in food, environmental, or clinical samples.
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This work was supported by the National Natural Science Foundation of China (31871874).
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Ying Wang, Shupeng Su, Shuyuan Du, Yu Gao, Zhixiang Xu, and Hongyan Zhang declare that they have no conflict of interest.
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Wang, Y., Su, S., Du, S. et al. Rapid Detection for Salmonella typhimurium by Conventional Resistive Temperature Sensor Based on Photothermal Effect of Carboxylated Graphene Oxide. Food Anal. Methods 13, 1755–1763 (2020). https://doi.org/10.1007/s12161-020-01793-5
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DOI: https://doi.org/10.1007/s12161-020-01793-5