Abstract
A total of 9 samples of individual dromedary raw milks from N'ajjer (3 samples), Targui (3 samples) and Reguibi (3 samples) breeds were collected from 3 camels nomad herd in south Algeria and were analysed for bacterial load. A total of 23 isolates of lactic acid bacteria were obtained and characterized; 12 isolates were cocci and 11 isolates were facultatively heterofermentative lactobacilli. Lactic acid bacteria were identified on the basis of phenotypic characters as Lactococcus lactis subsp. lactis, Enterococcus faecalis, Enterococcus faecium, Enterococcus durans, Lactobacillus paracasei subsp. paracsei, Lactobacillus plantarum and Lactobacillus rhamnosus. Lactococci, enterococci and lactobacilli showed proteolytic activity and were found that differ in their acidifying activities. Proteolytic and autolytic activities were generally higher for most lactobacilli compared to other isolates and none of the isolates produced biogenic amines under the conditions tested. A number of the 23 lactic acid bacteria isolates from Algerian dromedary milks that were characterized here showed properties suggest that they are good candidates for camels milk processing or other dairy fermentation process.
Highlights
Development and research activities on domestic animals are mostly concentrated on species and breeds of animals available in the temperate zones of Europe and North America
Five isolates were presumptively identified as L. lactis subsp. lactis, they were able to grow at 10 and 37°C, but not at 45°C, and not in pH 9.6 broth
Three of them seemed to be E. faecalis, as suggested by their ability to survive at 60°C for 30 min and to ferment sorbitol (Sharpe, 1979; Shleifer and Kilpper-Balz, 1984; Devriese et al, 1991; Manero and Blanch, 1999)
Summary
This work was aimed for isolation and characterization of lactic acid bacteria from raw milks of three breeds of Algerian dromedary and evaluated for their technologically important properties. Out of a total of 37 Isolates obtained from raw dromedary milks from three local breeds [N’ajjer (14 isolates), Targui (12 isolates) and Reguibi (11 isolates)], twenty-three strains showed positive Gram reactions, absence of mobility, absence of spore formation, absence of catalyse activity cocci which produced no gas from glucose (12 isolates), and/or rods (11 isolates).
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