The Aerobic Microflora and Lactic Acid Bacteria of Market Ayib.
1994
Mogessie Ashenafi
Ayib samples with pH values ranging from 3.6 to 4.3 were analyzed for their aerobic bacterial flora and lactic acid bacteria. The aerobic and coliform counts did not seem to correlate with the pH value of the samples. However sample with pH4 contained more bacterial groups than those with pH4. Yeast counts reached a level of 107 cfu g-1 in most samples. Coliform counts were not higher than 103 g-1. The Gram positive rods (66%) dominated the aerobic flora, Microbacterium and Brevibacterium spp. being the most abundant. Enterobacteriaceae and pseudomonas spp. constituted the bulk of the Gram negative rods (23%). The count of lactic acid bacteria was around 10-5 cfu g-1 and Lactobacillusfermenti and L. plantarum dominated the flora (56% and 36%, respectively). Since fresh ayib usually has a pH value of 4.0 the high number and variety of lactic acid bacteria and other aerobic microorganisms was found undesirable.
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