Determination of dynamic characteristics of microbiota in a fermented beverage produced by brazilian amerindians using culture-dependent and culture-independent methods

Abstract

Cauim is a fermented beverages prepared by Tapirapé Amerindians in Brazil from substrates such as cassava, rice, peanuts, pumpkin, cotton seed and maize. Here we study the microorganisms associated with peanut and rice fermentation using a combination of culture-dependent and -independent methods. The bacterial population varied from 7.4 to 8.4 log CFU/ml. The yeast population varied from 4.0 to 6.6 log CFU/ml. A total of 297 bacteria and yeasts strains were isolated during fermentation, with 198 bacteria and 99 yeast. The Lactobacillus genus was dominant throughout fermentation. Bacteria and yeast community dynamics during the fermentation process were monitored by PCR-DGGE analysis. Both culture-dependent and -independent methods indicated that the bacterial species L. plantarum, L. fermentum, L. paracasei and L. brevis as well as the yeast species P. guilliermondii, K. lactis, Candida sp, R. toruloides and Saccharomyces cerevisiae, were dominant during fermentation. Multivariate analysis of microorganisms during beverage fermentation showed that the microbial community changed during the fermentation process.