COMPARATIVE BACTERIOLOGICAL EXAMINATION OF SOYA MILK AND TIGER NUT MILK SOLD AT OGBETE MAIN MARKET ENUGU
Abstract
The tiger nut milk and soy milk served at Ogbete Main Market in Enugu were subjected to a comparative
bacteriological analysis. MacConkey and nutritional agar were used in the pour plate technique. The bacterial
species that were isolated were identified using biochemical tests and Gram-staining. Total bacterial mean counts
for soy milk and tiger nut milk were 168x103CFU/ml and 164x103CFU/ml, respectively, out of the ten samples
each that were examined. Brucella spp. had the highest number of bacterial organisms isolated from soy milk and
tiger nut milk (43x103CFU/ml (25.3%) and 37x103CFU/ml (22.6%), followed by Staphylococcus spp. with
32cfu/ml (18.8%) and 38x103CFU/ml (19.2%), Escherichia coli with 34x103CFU/ml (20.0%) and
32x103CFU/ml (19.5%), Streptococcus spp. with 21x103CFU/ml (18.2%) and 30x103CFU/ml (18.3%), and
Pseudomonas spp. with 30x103CFU/ml (17.6%) and 27x103CFU/ml (16.5%) respectively. Compared to tiger nut
milk, which contained 164x103CFU/ml, soy milk had a higher overall bacterial mean count of 168x103CFU/ml.
Poor basic material handling, an unclean processing environment, and inadequate processing techniques by
processors may have contributed to the pathogenic bacteria contamination of soy and tigernut milk.
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