Polyphasic Characterisation of Non-Starter Lactic Acid Bacteria from Algerian Raw Camel’s Milk and Their Technological Aptitudes
Yasmine Saidi1§, Beatriz del Rio2§, Djamel Eddine Senouci1, Begoña Redruello2, Beatriz Martinez2, Victor Ladero2*, Mebrouk Kihal1 and Miguel A. Alvarez2
1Applied Microbiology Laboratory, Department of Biology, Faculty ofNature and Life Sciences, University of Oran, 31000 Oran, Algeria
2Dairy Research Institute (IPLACSIC), Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
Received: 10 December 2019
Accepted: 31 July 2020
camel’s milk, lactic acid bacteria, molecular identification, acidifying capacity, proteolytic activity, biogenic amines
Research background. Consumption of spontaneously fermented camel’s milk is common in Algeria, making it a feasible source of diverse lactic acid bacteria (LAB) with the potential to be used as adjunct cultures to improve quality and safety of fermented dairy products.
Experimental approach. Twelve raw camel´s milk samples were used as a source of indigenous LAB, which were further characterised by examining 39 phenotypic traits with technological relevance.
Results and conclusions. Thirty-five non-starter LAB (NSLAB) were isolated from 12 Algerian raw camel's milk samples and they were microbiologically, biochemically and genetically characterised. Some isolates showed proteolytic activity, acidifying capacity, the ability to use citrate, and to produce dextran and acetoin. Ethanol, acetaldehyde, methyl acetate, acetoin and acetic acid were the major volatile compounds detected. Cluster analysis performed using the unweighted group with arithmetic average (UPGMA) method, and based on the thirty-nine phenotypic characteristics investigated, reflected the microbial diversity that can be found in raw camel´s milk.
Novelty and scientific contribution. The isolated strains, from a non-typical source, showed interesting technological traits to be considered as potential adjunct cultures. Cluster analysis based on the examined phenotypic characteristics proved to be a useful tool for the typification of isolates when no genetic information is available. These findings may be of use towards an industrialised production of camel's milk dairy products.
§These authors contributed equally to this work