Journal
APPLIED SPECTROSCOPY
Volume 76, Issue 7, Pages 812-822Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/00037028221079661
Keywords
Escherichia coli; indole production; surface-enhanced Raman spectroscopy detection; SERS detection; metabolic products
Categories
Funding
- Guangzhou Key Laboratory for Intelligent Sensing and Quality Control of Agricultural Products [202102100009]
- Guangdong Provincial Science and Technology Plan Projects [2020A1414010160]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010936]
- Contemporary International Collaborative Research Centre of Guangdong Province on Food Innovative Processing and Intelligent Control [2019A050519001]
- Common Technical Innovation Team of Guangdong Province on Preservation and Logistics of Agricultural Products [2021KJ145]
- China Scholarship Council [2018GXZ013425]
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A SERS-based technique was developed for the detection of bioactive metabolite indole produced by E. coli. The use of highly sensitive nanoparticles allowed for detection of low concentrations of indole in biological media. Supplementation of growth media with exogenous tryptophan affected the production of indole and the growth of bacterial cells.
Detection of bioactive metabolites produced by bacteria is important for identifying biomarkers for infectious diseases. In this study, a surface-enhanced Raman spectroscopy (SERS)-based technique was developed for the detection of bioactive metabolite indole produced by Escherichia coli (E. coli) in biological media. The use of highly sensitive Au@Ag core-shell nanoparticles resulted in the detection of indole concentration as low as 0.0886 mM in standard solution. The supplementation of growth media with 5 mM of exogenous tryptophan resulted in the production of a maximum yield of indole of 3.139 mM by E. coli O157:H7 at 37 degrees C. The growth of bacterial cells was reduced from 47.73 x 10(8) to 1.033 x 10(6) CFU/mL when the cells were grown in 0 and 10 mM exogenous tryptophan, respectively. The amount of indole in the Luria-Bertani (LB) media had an inverse correlation with the growth of cells, which resulted in a three-log reduction in the colony-forming unit when the indole concentration in the media was 20 times higher than normal. This work demonstrates that SERS is an effective and highly sensitive method for rapid detection of bioactive metabolites in biological matrix.
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