Document Detail


Microbiological and physicochemical characterization of small-scale cocoa fermentations and screening of yeast and bacterial strains to develop a defined starter culture.
MedLine Citation:
PMID:  22636007     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Spontaneous cocoa bean fermentations performed under bench- and pilot-scale conditions were studied using an integrated microbiological approach with culture-dependent and culture-independent techniques, as well as analyses of target metabolites from both cocoa pulp and cotyledons. Both fermentation ecosystems reached equilibrium through a two-phase process, starting with the simultaneous growth of the yeasts (with Saccharomyces cerevisiae as the dominant species) and lactic acid bacteria (LAB) (Lactobacillus fermentum and Lactobacillus plantarum were the dominant species), which were gradually replaced by the acetic acid bacteria (AAB) (Acetobacter tropicalis was the dominant species). In both processes, a sequence of substrate consumption (sucrose, glucose, fructose, and citric acid) and metabolite production kinetics (ethanol, lactic acid, and acetic acid) similar to that of previous, larger-scale fermentation experiments was observed. The technological potential of yeast, LAB, and AAB isolates was evaluated using a polyphasic study that included the measurement of stress-tolerant growth and fermentation kinetic parameters in cocoa pulp media. Overall, strains L. fermentum UFLA CHBE8.12 (citric acid fermenting, lactic acid producing, and tolerant to heat, acid, lactic acid, and ethanol), S. cerevisiae UFLA CHYC7.04 (ethanol producing and tolerant to acid, heat, and ethanol), and Acetobacter tropicalis UFLA CHBE16.01 (ethanol and lactic acid oxidizing, acetic acid producing, and tolerant to acid, heat, acetic acid, and ethanol) were selected to form a cocktail starter culture that should lead to better-controlled and more-reliable cocoa bean fermentation processes.
Authors:
Gilberto Vinícius de Melo Pereira; Maria Gabriela da Cruz Pedrozo Miguel; Cíntia Lacerda Ramos; Rosane Freitas Schwan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-05-25
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  78     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-07-19     Completed Date:  2012-12-10     Revised Date:  2013-06-24    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5395-405     Citation Subset:  IM    
Affiliation:
Biology Department, Federal University of Lavras, Lavras, Minas Gerais, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Acetobacter / growth & development,  metabolism*
Brazil
Cacao / microbiology*,  physiology
Culture Media / chemistry*
Denaturing Gradient Gel Electrophoresis
Fermentation / physiology*
Food Microbiology*
Kinetics
Lactobacillus / growth & development,  metabolism*
Polymerase Chain Reaction
Saccharomyces cerevisiae / growth & development,  metabolism*
Chemical
Reg. No./Substance:
0/Culture Media
Comments/Corrections

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