Lactobacillus delbruckii

Glyceritol teichoic acid was shown to be present in Lactobacillus casei, Lactobacillus delbruckii, Lactobacillus bulgaricus, Staphylococcus albus, and Staphylococcus citreus, but no ribitol teichoic acid could be detected. The teichoic acid from Staphylococcus albus and Staphylococcus citreus was shown to be present in the walls. The teichoic acid from Lactobacillus casei is of the type shown in formula XV. Walls from Streptococcus faecalis contain both polymers. 

Lactic acid production is based on synthesis starting from ethanal, leading to racemic D,L-lactic acid (Formula 8.25) or on homofermentation Lactobacillus delbruckii, L. bulgaricus, L. leichmannii) of carbohydrate-containing raw material, which generally provides L-but also D,L-lactic acids under the conditions of fermentation. 

A pyridine ribosidase from Xanthomonas pruni has been described which splits nicotmamide riboside in preference to purine ribosides (18 ). The relative activity towards nicotinamide riboside and inosine is about 30 to 1. In contrast to this, extracts of SaccJiaromyces cereviaiae promote the hydroljrtic cleavage of nicotinamide riboside and inosine at approximately the same rate (183). A hydrolytic nucleoadase from a strain of Lactobacillus delbruckii has been purified and also shown to have equal activity towards the two nucleosides (184). Xanthomonas pyridine nucleosidase appears to be unusual for bacteria its significance is not clear as yet. 

Isol. as a water soluble polysaccharide from Kefir grains, the innoculating material used for conversion of milk into the Russian beverage Kefir. Consists of yeast and bacteria, predominantly Saccharomyces delbruckii and Lactobacillus brevis. About 25% of the dry material of the Kefir grain consists of the capsular polysaccharide of L. brevis. Sol. H2O. [a] -f-68 (c, 1.0 in H2O). Conts. an equal proportion of galactose and glucose residues. Mol. wt. of 20600 (average of 1127 hexose units). 

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