Abstract
Probiotics are live microorganisms which are health benefits via balancing the microorganisms
in the intestinal system. Corn milk samples prepared from sweet corn and water at three
different ratios as 1:1, 1:2 and 1:3 were used to produce corn milk yogurt and it was found that
corn milk yogurt made from sweet corn and water at 1:2 ratio gave the highest overall liking
score but it was not significantly different from the one made from 1:3 ratio. Then, two types
of stabilizers including gelatin and carboxymethylcellulose (CMC) at the concentration of 0,
0.2, 0.4, and 0.6% were added to yogurt and the result showed that gelatin at 0.2% was the
suitable one which contributed the highest overall liking score. Moreover, different levels of
yogurt starter at 2, 3, 4 and 5% were determined for corn milk yogurt production and it revealed
that 2% yogurt starter was the minimum amount which contributed the lowest percentages of
syneresis with insignificant differences in overall liking scores. Growth curves of Lactobacillus
acidophilus TISTR1338 and Lactobacillus casei TISTR390 were also investigated and it was
shown that both strains would grow into the stationary phase after 28 hrs of incubation at 37°C
with the numbers of 9 log cfu/ml. Finally, both probiotic strains were supplemented in corn
milk yogurt and determined for their survival during storage at 5o
C for 15 days. It was shown
that L. casei TISTR390 could survive significantly better than L. acidophilus TISTR1338 with
the numbers of 9.11 and 8.76 log cfu/g respectively which were higher than the minimum
therapeutic dose (6 log cfu/g).