3.2 Microbiological quality of red rice extract drink
Washing and UV radiation did not differently affect the bacterial load in the rice drink as similar counts were observed between dry and moist grains or among all periods of radiation (Fig. 2). Moreover, different conditions of ultrasonication resulted in a comparable bacterial load in red rice extract drink although at 100 kHZ, 60°C for 120 min seemed to result in a higher count of bacteria. Note that bacterial numbers were slightly higher than in a drink compared to on a grain, and that data from a dry grain, which was radiated for 60 min before ultrasonicated at 100 kHZ, 60°C for 120 min, were excluded due to cross-contamination. No colony of yeast and mold was found in any types of rice drink at a detection of 10 CFU•mL-1.