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A face-centered factorial design was used to study the influence of temperature, cellulase, and pectinase concentration on the production of Saccharomyces boulardii cells during simultaneous saccharification and fermentation of organic and conventional apple substrate pulp. The effects of the variables fermentation temperature (25-35 °C), pectinase concentration (5-25 μL/100 g), and cellulase concentration (4-8 μL/100 g) were analyzed by multiple regression and polynomial models of second order, providing the ideal conditions for yeast cultivation. Cellular production of apple substrates was expressed in log CFU/mL. The optimum condition for temperature was 27.5 °C, and 20 and 5 μL/100 g for pectinase and 8 and 7 μL/100 g for cellulase concentrations for organic and conventional apple pulp, respectively. The observed viability values were in agreement with the predicted values of 8.352 log CFU/mL (organic) and 8.317 log CFU/mL (conventional) apple pulps, thus proving the effectiveness of the models.

food science and biotechnology/food science and biotechnology

Saccharomyces boulardii: Optimization of simultaneous saccharification and fermentation of cell production in organic and conventional apple substrate pulp