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Microorganisms 2016, 4(4), 44; doi:10.3390/microorganisms4040044

Modeling Lactic Fermentation of Gowé Using Lactobacillus Starter Culture

1
Instituto Superior de Tecnologia Agro-Alimentar de Malanje—ISTAM, EN. 230, Cangambo, Malanje, Angola
2
Montpellier SupAgro, UMR Qualisud, Montpellier 34398, France
3
CIRAD, UMR Qualisud, Montpellier 34398, France
*
Author to whom correspondence should be addressed.
Academic Editors: Régine Talon and Monique Zagorec
Received: 19 September 2016 / Revised: 21 November 2016 / Accepted: 23 November 2016 / Published: 1 December 2016
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Abstract

A global model of the lactic fermentation step of gowé was developed by assembling blocks hosting models for bacterial growth, lactic acid production, and the drop of pH during fermentation. Commercial strains of Lactobacillus brevis and of Lactobacillus plantarum were used; their growth was modeled using Rosso’s primary model and the gamma concept as a secondary model. The optimum values of pH and temperature were 8.3 ± 0.3, 44.6 ± 1.2 °C and 8.3 ± 0.3, 3.2 ± 37.1 °C with μmax values of 1.8 ± 0.2 and 1.4 ± 0.1 for L. brevis and L. plantarum respectively. The minimum inhibitory concentration of undissociated lactic acid was 23.7 mM and 35.6 mM for L. brevis and L. plantarum, respectively. The yield of lactic acid was five times higher for L. plantarum than for L. brevis, with a yield of glucose conversion to lactic acid close to 2.0 for the former and 0.8 for the latter. A model was developed to predict the pH drop during gowé fermentation. The global model was partially validated during manufacturing of gowé. The global model could be a tool to aid in the choice of suitable starters and to determine the conditions for the use of the starter. View Full-Text
Keywords: lactic acid bacteria; fermented food; cereal based product; growth; mathematical model lactic acid bacteria; fermented food; cereal based product; growth; mathematical model
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MDPI and ACS Style

de J. C. Munanga, B.; Loiseau, G.; Grabulos, J.; Mestres, C. Modeling Lactic Fermentation of Gowé Using Lactobacillus Starter Culture. Microorganisms 2016, 4, 44.

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