It is known that the heterofermentative LAB can produce acetic acid and ethanol via 6p-gluconate pathway, and the homofermentative LAB use Embden-Meyerhof-Parnas pathway to produce lactic acid. As shown in Fig.4B, although L.eu1426 did not disappear in the co-culture fermentation from 24 h to 60 h, the concentration of acetic acid was not notably (p > 0.05) increased.
Differently, the concentration of acetic acid increased until 72 h in L.eu1426 fermentation. Although the increase in acetic acid level was more rapid in the co-culture than in L.eu1426 fermentation,the final concentration of acetic acid in L.eu1426 fermentation was higher (p < 0.05). Oliveira et al. (2012a, 2012b) reported that the
increase of acetic acid level had a slight inhibition in S. thermophilus and B. lactobacillus co-culture compared with in B. lactobacillus culture in fermented milk. The change profile of ethanol was similar to that of acetic acid (Data not shown). Furthermore, the final concentration of ethanol was higher in starter fermentation of
L.eu1426 (2.1 mM) than in the co-culture fermentation (1.6 mM).
It is known that the heterofermentative LAB can produce acetic acid and ethanol via 6p-gluconate pathway, and the homofermentative LAB use Embden-Meyerhof-Parnas pathway to produce lactic acid. As shown in Fig.4B, although L.eu1426 did not disappear in the co-culture fermentation from 24 h to 60 h, the concentration of acetic acid was not notably (p > 0.05) increased.Differently, the concentration of acetic acid increased until 72 h in L.eu1426 fermentation. Although the increase in acetic acid level was more rapid in the co-culture than in L.eu1426 fermentation,the final concentration of acetic acid in L.eu1426 fermentation was higher (p < 0.05). Oliveira et al. (2012a, 2012b) reported that theincrease of acetic acid level had a slight inhibition in S. thermophilus and B. lactobacillus co-culture compared with in B. lactobacillus culture in fermented milk. The change profile of ethanol was similar to that of acetic acid (Data not shown). Furthermore, the final concentration of ethanol was higher in starter fermentation ofL.eu1426 (2.1 mM) than in the co-culture fermentation (1.6 mM).
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