Abstract
The aim of this study was to isolate and characterize new Lactobacillus strains in order to check their β-galactosidase activity. A total of 28 strains were isolated from camel and goat milks collected from the Algerian Sahara. These strains were identified with the method of Polymerase Chain Reaction (PCR) of the 16S rRNA gene. Their ability to hydrolyze O-nitrophenyl-β-D ga-lactopyranoside (ONPG) was determined. Cell lysis method involving soni-cation and lysozyme treatment was used for β-galactosidase release from the isolated strains. Analysis of their 16S rRNA gene sequences revealed that the strains clustered in the Lactobacillus genus, 17 isolates were identified as L. plantarum, 10 isolates as L. herbarum and one isolate as L. brevis. The best intracellular enzymatic β-galactosidase activities obtained in descending order are 14.84 (L. plantarum P4), 14.66 (L. plantarum P17), 14.33 (L. planta-rum P12), 14.10 (L. plantarum P10), 13.49 (L. plantarum P6), 12.13 (L. herba-rum H10) and 11.27 (L. plantarum P7) U/mL; while a very low level of this activity was found for Lactobacillus brevis B1. These findings are an argu-ment for the use of these isolated Lactobacilli in the dairy industry in order to alleviate lactose intolerance.
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