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Mass transfer characterization of gamma-aminobutyric acid production by Enterococcus faecium CFR 3003: encapsulation improves its survival under simulated gastro-intestinal conditions

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Abstract

Gamma-aminobutyric acid (GABA) production by free and Ca-alginate encapsulated cells of Enterococcus faecium CFR 3003 was investigated. Mass transfer rates characterizing the GABA production process using encapsulated cells were investigated. Experiments were performed to investigate external film and internal pore diffusion mass transfer rates. The Damkohler and Thiele analysis provides a good description of external film and internal pore diffusion resistances, respectively. The experiments revealed that the external film effects could be neglected but the process is affected to the greater extent by internal mass transfer effects and was found to be the principal rate-controlling step. Protective effect of encapsulation on cell survivability was tested under digestive environment, when challenged to salivary α-amylase, simulated gastric fluid and intestinal fluid. Viability of encapsulated cells was significantly higher under simulated gastro-intestinal conditions and could produce higher GABA than those observed with free cells. The results indicate that the Ca-alginate encapsulated probiotics could effectively be delivered to the colonic site for effective inhibitory action.

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Acknowledgments

Gangaraju Divyashri is thankful to Council of Scientific and Industrial Research (CSIR), New Delhi, India for the award of Junior Research Fellowship. The Director, CFTRI, is acknowledged for supporting the research work.

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There is no conflict of interest between the authors.

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Authors and Affiliations

  1. Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110 025, India

    Gangaraju Divyashri

  2. Fermentation Technology and Bioengineering Department, CSIR-Central Food Technological Research Institute (CSIR-CFTRI), Mysore, 570 020, India

    Gangaraju Divyashri & Siddalingaiya Gurudatt Prapulla

Authors
  1. Gangaraju Divyashri
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  2. Siddalingaiya Gurudatt Prapulla
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Correspondence to Siddalingaiya Gurudatt Prapulla.

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Divyashri, G., Prapulla, S.G. Mass transfer characterization of gamma-aminobutyric acid production by Enterococcus faecium CFR 3003: encapsulation improves its survival under simulated gastro-intestinal conditions. Bioprocess Biosyst Eng 38, 569–574 (2015). https://doi.org/10.1007/s00449-014-1296-0

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  • DOI: https://doi.org/10.1007/s00449-014-1296-0

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