2. Isolation of lactic acid bacteria with
produced bacteriocin from fermented
of vegetable, fruit and cereal products
Khanitha Panya, Sumitra Ruecha
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Abstract
Isolation of lactic acid bacteria (LAB) with
produced bacteriocin from 30 fermented
vegable,fruit and cereal product samples by using
MRS agar with 1% CaCO3. The results showed that,
21 LAB isolates were gram positive, nonsporing,
catalase negative, 12 isolates were cocci shaped and
9 isolates were rod shaped. Furthermore, agar well
diffusion assay was used to detect the bacteriocin
activity by using indicator strains, Bacillus cereus,
Escherichia coli, Staphylococcus aureus and
Salmonella sp. LAB isolate E1, E2 and I2 could inhibit
B. cereus. The results from identification using a
commercial test kit API 50 CHL system (Biomerieux),
isolate E1 and E2 were Lactobacillus acidophilus and
I2 was Pediococcus sp.
The primary characterization of bacteriocin
activity from Lb. acidophilus E1 showed that its
activity was not affected when treated at 63 and 80
๐
C and was stable at pH 5-7. Wherease Lb.
acidophilus E2 and Pediococcus sp. I2 were lost