Abstract: Glucose metaboliccharacteristics of Lactobacillus amylovorus JCM1126 and Lactobacillus amylophilns JCM1125I in the MRS cultural medium with two cereal starches and some soluble starch substitute for the glucose were studied. For Lactobacillus amylovorus JCM1126, the graph of colony quantity proliferaton had a single peak, and the drop of pH was similar to that in cultural medium taking glucose as carbon source. For Lactobacillus amylophilus JCM1125, its graph had two peaks, and pH dropping rate was remarkably slower than that taking glucose as carbon source. 48 hours later both bactewla showed more colony quantities taking starches as carbon source than those taking glucose as carbon scurce. As shown above the two bacterias were sharply different in the way they metabolized.

Key words: Lactic acid bacteria Glucose Colony quantity Potential hydrogen Cereal starch