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The antagonistic activities of 30 strains of lactobacilli against Helicobacter pylori were determined and Lactobacillus helveticus CU631 has been selected as the strain which possesses the strongest inhibitory effect in the disc diffusion assay showing inhibition zone diameter of 10±1.5 mm, whereas those of L. plantarum and L. fermentum have been shown to be 4.0±0.6 mm. H. pylori G88016 revealed the highest vacuolating toxin producing activity among the 8 strains, the inhibitory activity of L. helveticus CU631 in vacuolating toxin producing activity of H. pylori manifested in the co-culture of two strains and in the 5:5 mixture of supernatant of the two strains. Both L. helveticus CU631 and cell free culture supernatant had a strong inhibitory activities in urease and cytotoxin producing activities of H. pylori NCTC11637 and CJH12. An accelerated proteolytic activity of water soluble peptides by L. helveticus CU631 during the refrigeration storage has been manifested in the cream cheese. DNA seqences of 16S-23S ribosomal RNA spacer region showed typical pattern among the various strains of L. helveticus, which could be used in the identification of L. helveticus CU 631. (Asian-Aust. J. Anim. Sci. 2002. Vol 15, No. 7 : 1057-1065)

Antagonism against Helicobacter Pylori and Proteolysis of Lactobacillus Helveticus CU631 and Strain Identification