Análise microbiológica do quefir em grãos, suspensão liofilizado e adicionado à ração de coelhos

Abstract

Probiotics are supplementary foods produced by living microorganisms that improve animal health by promoting balance of the intestinal microbiota To be considered probiotic the microorganism must either be a normal inhabitant of the gastrointestinal tract survive the passage through the stomach resist the action of digestive enzymes and bile and keep its viability and metabolic activity in the intestines Kefir is a probiotic made by several bacteria and yeasts encapsulated in a polyssacharide matrix and looking like jelly grains Traditional kefir is a byproduct of milk resulting from double fermentation alcoholic and lactic There are two kinds of kefir sugary in aqueous fermentation and milky Kefir grains and their supernatant are composed of microorganisms polysacharides aminated molecules vitamins aminoacids peptides ethanol and volatile compounds Kefir is known to have diverse microbial contents depending on country and fermentative substrates what causes distinct probiotic effects So the purpose of this paper was to isolate identify quantify and characterize the microorganisms of kefir samples including the kefir added to food pellets for rabbits Serial dilutions of distinct kefir sources (fermented suspension lyophilized grains) and mixed pellets were plated in Rogosa agar (AR) and De Man Rogosa and Sharpe (MRS) for Lactobacillus Brain Heart Infusion (BHI) for total bacteria Sabouraud-glucose for yeast and filamentous fungi thioglycolate for Streptococcus Acetobacteria and Leuconostoc coconut water agar (AAC) and coconut water agar supplemented with yeasts (AACE) In pellet analysis plating with Mitis Salivarius agar (Streptococcus) EMB35ºC (total enterobacteria) and EMB45ºC (fecal enterobacteria) were also used Genus and species of all strains were identified through usual biochemical reactions and specific API systems In general literature recognize the existence of differences in kefir microbial contents depending on the source of the grains but the kefir of this study has a microbial composition similar to the one described in the literature and also shows other microorganisms not reported yet The data obtained with the AAC and AACE media suggested that both substrates are alternative and salutary media for culture of kefir strains