Probiotic Potential, Antioxidant Activity, and Phytase Production of Indigenous Yeasts Isolated from Indigenous Fermented Foods
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While many bacteria have been used as probiotics by industries, only two yeasts, Saccharomyces cerevisiae var. boulardii and Kluyveromyces fragilis (B0399), have been used for this purpose. In the present work, a total of 116 yeasts isolated from Brazilian indigenous fermented food, cocoa fermentation, and kefir were in vitro characterized for probiotic attributes. From 116 isolates, 36 were tolerant to gastrointestinal conditions evaluated by tolerance to pH 2.0, bile salts (0.3% w/v), and 37 °C temperature. From those, 15 isolates showed a similar or higher percentage (P < 0.05) of hydrophobicity, autoaggregation, and coaggregation with E. coli than the reference strain S. boulardii. All these strains showed a high percentage of adhesion to Caco-2 cells (> 63%) and antioxidant activity (ranging from 18 to 62%). Phytate hydrolysis was evaluated for these yeasts and 13 strains showed positive results, which is important for nutrient availability in plant-based foods. These results are important insights for characterization of novel probiotic yeast strains as well as to aggregate functional value to these food products.
KeywordsProbiotics Phytase Antioxidant activity Adhesion Caco-2
The authors thank to the CCMA for providing the strains used in this work.
This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico do Brasil (CNPq), Fundação de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG), and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).
Compliance with Ethical Standards
Conflicts of Interest
The authors declare that they have no conflict of interest.
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