Growth Kinetics and Survival of Lactobacillus Acidophilus in Black Rice Milk

Abstract

The growth kinetics of Lactobacillus acidophilus in black rice milk, white rice milk and MRS Broth were calculated by applying the experimental data to the Gompertz equation using DataFit software. The survival of L. acidophilus in black rice and white rice milk was monitored during storage (4°C, 20 days). The shortest lag phase duration (1.45 h) and the highest maximum population density (7.48 log CFU/mL) were in black rice milk (P <0.05). The generation time in black rice milk (1.31 h) was longer than in white rice milk (0.58 h) but shorter than in MRS Broth (2.22 h, P <0.05). L. acidophilus population declined in both milk at 4°C, but higher in black rice than white rice at the end of the storage period. It was concluded that black rice supports the growth of L. acidophilus compared to white rice and MRS Broth while contributing to its survival during cold storage.