3.2. Consumption of sugars and produced metabolites
Figs. 4 and 5 illustrate themetabolic behaviors of the strains either in
pure cultures or in co-cultures. They were monitored in fermented PSM
by determination of the main metabolic products (lactic, acetic, succinic
acids, and ethanol) and consumed sugars. As shown in Fig. 4, the L. acidophilus (LACA 4), P. acidilactici (UFLA BFFCX 27.1), and S. cerevisiae
(UFLA YFFBM 18.03) strains in single cultures produced 3.26, 0.26 and
0.03 g/L, respectively, of lactic acid after 24 h of fermentation. The
highest values (9.03 and 8.51 g/L) were found in fermentations after
24 h at 4 °C in a binary culture of P. acidilactici and L. acidophilus, and
in combination of the three strains, respectively. The marked lactic
acid increase in co-culture fermentations could be due to interactions
between the different species used. These results highlighted the importance
of the selection of the substrate composition and inocula in
the development of the organoleptic properties of these fermented
products.
3.2. Consumption of sugars and produced metabolites
Figs. 4 and 5 illustrate themetabolic behaviors of the strains either in
pure cultures or in co-cultures. They were monitored in fermented PSM
by determination of the main metabolic products (lactic, acetic, succinic
acids, and ethanol) and consumed sugars. As shown in Fig. 4, the L. acidophilus (LACA 4), P. acidilactici (UFLA BFFCX 27.1), and S. cerevisiae
(UFLA YFFBM 18.03) strains in single cultures produced 3.26, 0.26 and
0.03 g/L, respectively, of lactic acid after 24 h of fermentation. The
highest values (9.03 and 8.51 g/L) were found in fermentations after
24 h at 4 °C in a binary culture of P. acidilactici and L. acidophilus, and
in combination of the three strains, respectively. The marked lactic
acid increase in co-culture fermentations could be due to interactions
between the different species used. These results highlighted the importance
of the selection of the substrate composition and inocula in
the development of the organoleptic properties of these fermented
products.
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