From table 1, the pH values of fermented flours significantly decreased while the total acidity
significantly increased with increased fermentation time (p < 0.05). These changes in fermented rice
flour were probably the result of the microbial activity. According to Narong (1985), the optimum
percentage of lactic acid and pH value of fermented rice slurry in Kanom-jeen should be 0.95 - 1.10
and 3.00–3.50, respectively. Therefore, the optimum fermentation time should approximately be 24 h.