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Biochemical characterization of pathogenic bacterial species using Raman spectroscopy and discrimination model based on selected spectral features

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Abstract

This study aimed to evaluate the differences in the Raman spectra of nine clinical species of bacteria isolated from infections (three Gram-positive and six Gram-negative species), correlating the spectra with the chemical composition of each species and to develop a classification model through discriminant analysis to categorize each bacterial strain using the peaks with the most significant differences. Bacteria were cultured in Mueller Hinton agar and a sample of biomass was harvested and placed in an aluminum sample holder. A total of 475 spectra from 115 different strains were obtained through a dispersive Raman spectrometer (830 nm) with exposure time of 50 s. The intensities of the peaks were evaluated by one-way analysis of variance (ANOVA) and the peaks with significant differences were related to the differences in the biochemical composition of the strains. Discriminant analysis based on quadratic distance applied to the peaks with the most significant differences and partial least squares applied to the whole spectrum showed 89.5% and 90.1% of global accuracy, respectively, for classification of the spectra in all the groups. Raman spectroscopy could be a promising technique to identify spectral differences related to the biochemical content of pathogenic microorganisms and to provide a faster diagnosis of infectious diseases.

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Funding

Partial financial support was provided by São Paulo Research Foundation (FAPESP) (Grant no. 2009/01788-5) and National Council for Scientific and Technological Development (CNPq) (Process no. 307509/2017-6). F. S. S. Oliveira and A. M. da Silva received the doctorate fellowship from Brazilian Ministry of Education, Coordination for the Improvement of Higher Education Personnel (CAPES - PROSUP).

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Authors and Affiliations

  1. Instituto de Ciências da Saúde, Universidade Paulista – UNIP, Rod. Pres. Dutra, km 157, São José dos Campos, SP, 12240-420, Brazil

    Fernanda SantAna de Siqueira e Oliveira & Adriano Moraes da Silva

  2. Center for Innovation, Technology and Education – CITE, Universidade Anhembi Morumbi - UAM, Parque Tecnológico de São José dos Campos, Estr. Dr. Altino Bondensan 500, São José dos Campos, SP, 12247-016, Brazil

    Marcos Tadeu Tavares Pacheco & Landulfo Silveira Jr

  3. Laboratório Oswaldo Cruz, Pça Candida Maria Cesar Sawaya Giana 128, São José dos Campos, SP, 12243-003, Brazil

    Hector Enrique Giana

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  1. Fernanda SantAna de Siqueira e Oliveira
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de Siqueira e Oliveira, F.S., da Silva, A.M., Pacheco, M.T.T. et al. Biochemical characterization of pathogenic bacterial species using Raman spectroscopy and discrimination model based on selected spectral features. Lasers Med Sci 36, 289–302 (2021). https://doi.org/10.1007/s10103-020-03028-9

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