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Differentiation of foodborne bacteria using NIR hyperspectral imaging and multivariate data analysis

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Abstract

The potential for near-infrared (NIR) hyperspectral imaging and multivariate data analysis to be used as a rapid non-destructive tool for detection and differentiation of bacteria was investigated. NIR hyperspectral images were collected of Bacillus cereus, Escherichia coli, Salmonella enteritidis, Staphylococcus aureus and Staphylococcus epidermidis grown on agar for 20 h at 37 °C. Principal component analysis (PCA) was applied to mean-centred data. Standard normal variate (SNV) correction and the Savitzky-Golay technique was applied (2nd derivative, 3rd-order polynomial; 25 point smoothing) to wavelengths in the range of 1103 to 2471 nm. Chemical differences between colonies which appeared similar in colour on growth media (B. cereus, E. coli and S. enteritidis.) were evident in the PCA score plots. It was possible to distinguish B. cereus from E. coli and S. enteritidis along PC1 (59 % sum of squares (SS)) and between E. coli and S. enteritidis in the direction of PC2 (6.85 % SS). S. epidermidis was separated from B. cereus and S. aureus along PC1 (37.5 % SS) and was attributed to variation in amino acid and carbohydrate content. Two clusters were evident in the PC1 vs. PC2 PCA score plot for the images of S. aureus and S. epidermidis, thus permitting distinction between species. Differentiation between genera (similarly coloured on growth media), Gram-positive and Gram-negative bacteria and pathogenic and non-pathogenic species was possible using NIR hyperspectral imaging. Partial least squares discriminant analysis (PLS-DA) models were used to confirm the PCA data. The best predictions were made for B. cereus and Staphylococcus species, where results ranged from 82.0 to 99.96 % correctly predicted pixels.

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Acknowledgments

This work is based on the research supported in part by the National Research Foundation of South Africa for the grant, Unique Grant No. 94031. The authors wish to thank Prof Alvaro Viljoen, Dr. Ilze Vermaak and Carmen Leonard, Tshwane University of Technology, Pretoria for use of the NIR hyperspectral imaging system and microbiology laboratory.

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  1. Department of Food Science, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch, 7602, South Africa

    Terri-Lee Kammies, Marena Manley, Pieter A. Gouws & Paul J. Williams

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  1. Terri-Lee Kammies
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  2. Marena Manley
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  3. Pieter A. Gouws
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  4. Paul J. Williams
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Correspondence to Paul J. Williams.

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Kammies, TL., Manley, M., Gouws, P.A. et al. Differentiation of foodborne bacteria using NIR hyperspectral imaging and multivariate data analysis. Appl Microbiol Biotechnol 100, 9305–9320 (2016). https://doi.org/10.1007/s00253-016-7801-4

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  • DOI: https://doi.org/10.1007/s00253-016-7801-4

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