pH
The pH of BTK, GTK and TWK was decreased with
fermentation time (Fig. 1). During the fermentation process,
bacteria and yeasts metabolize sucrose into a number
of organic acids such as acetic acid and glucuronic acid.
Due to an increased concentration of these organic aids,
the pH decreased from 5 to 3 within 12 days of fermentation.
A slight increase in pH was observed after 12th day.
These observations are in agreement with the findings of
other studies (Chen & Liu, 2000; Reiss, 1994; Sreeramulu
et al., 2000).