Evaluation of lysine and methionine production in some lactobacilli and yeasts from Ogi

Lysine and methionine producing cultures of Lactobacillus and yeasts in batch fermentation of ogi were selected by growth in the presence of the analogues, S-2-aminoethyl-l-cysteine (thialysine) and ethionine respectively. The study shows that 42.5% of the Lactobacillus and 83.3% of the yeast isolates tested were capable of lysine production while 25.0% of the Lactobacillus and 87.8% of the yeast isolates produced methionine. The lysine and methionine yields of Lactobacillus were significantly (P<0.01) higher than that of yeasts. The majority of the yeast isolates excreted most of the lysine and methionine produced. More lysine was produced than methionine in all tested isolates.