First, we investigated the time course of changes in the composition and content of isoflavone along with the fermentation time (0–48 h) of a yellow-soybean tempeh as shown in Fig. 1. The content of the three types of isoflavone-aglycon increased with fermentation time, and became approximately twofold after 24 h fermentation compared
with that before fermentation (0 h). Among the nine types of isoflavone-glucoside, the content of malonylglucoside increased transiently from 12 to 24 h of fermentation. However, the contents of monoglucoside and acetylglucoside decreased with fermentation time. As a result, the total content of isoflavone (both aglycon and glucoside) decreased as the fermentation process progressed. Therefore, a sufficient increase in the isoflavone content, especially that of its aglycon form, could not be expected during tempeh fermentation
First, we investigated the time course of changes in the composition and content of isoflavone along with the fermentation time (0–48 h) of a yellow-soybean tempeh as shown in Fig. 1. The content of the three types of isoflavone-aglycon increased with fermentation time, and became approximately twofold after 24 h fermentation compared
with that before fermentation (0 h). Among the nine types of isoflavone-glucoside, the content of malonylglucoside increased transiently from 12 to 24 h of fermentation. However, the contents of monoglucoside and acetylglucoside decreased with fermentation time. As a result, the total content of isoflavone (both aglycon and glucoside) decreased as the fermentation process progressed. Therefore, a sufficient increase in the isoflavone content, especially that of its aglycon form, could not be expected during tempeh fermentation
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