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    Comparison of biochemical characteristics of Lactobacilli isolates from food and bovine rumen sources under low pH and bile salt stress conditions

    Jose, Neethu Maria; Bunt, Craig; Hussain, Malik
    Abstract
    In this study, two lactobacilli isolates, from dairy food and bovine rumen, were used to investigate the differences in their biochemical characteristics when exposed to low pH and bile salt stress conditions. Production of volatile compounds was analysed by gas liquid chromatography (GLC), alterations in fatty acid profiles of bacterial cells by chromatography-mass spectrophotometry (GC-MS), and changes in protein banding patterns were detected using 1D SDS PAGE. Significant differences were found in the production of acetic acid by stressed and non-stressed cells. Hexanoic acid and octanoic acid production was observed by the cells exposed to bile salt stress only. For both isolates, the saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA) levels were significantly different for all treatments, except however an increased level of polyunsaturated fatty acids (PUFA) production under bile salts stress was observed. The comparison of the 1-D protein banding patterns of non-stressed and pH stressed and bile salts stressed cells revealed several protein bands were differentially expressed. Findings of this investigation suggest that lactobacilli isolates possess variation in biochemical characteristics on the basis of origin and in their response to low pH and high bile salt stress conditions.... [Show full abstract]
    Keywords
    lactobacilli isolates; gas liquid chromatography; chromatography-mass spectrophotometry
    Fields of Research
    0908 Food Sciences; 060899 Zoology not elsewhere classified
    Date
    2017-04
    Type
    Journal Article
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    • Department of Wine, Food and Molecular Biosciences [716]
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    DOI
    https://doi.org/10.3303/CET1756312
    Metadata
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    © 2017, AIDIC Servizi S.r.l.
    Citation
    Jose, N.M., Bunt, C.R., & Hussain, M.A. (2017). Comparison of biochemical characteristics of lactobacilli isolates from food and bovine rumen sources under low ph and bile salt stress conditions. Chemical Engineering Transactions, 56, 1867-1872. doi:10.3303/CET1756312
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