Abstract
Randomly amplified polymorphic DNA (RAPD) patterns and pulsed-field gel electrophoresis (PFGE) patterns were used for the characterization of ropy slime-producing Lactobacillus sake strains. The two most revealing commercially available primers (OPJ 12 and OPJ 16, Operon Inc. Alameda, USA) and two rare-cutting enzymes ( AvrII and SmaI) were chosen from a pretested lot for the typing of 69 ropy slime-producing strains, 7 non-ropy isolates and 4 non-ropy reference strains. Both RAPD and PFGE patterns confirmed the group division established in previous studies and provided new information concerning ropy slime-producing strains. PFGE patterns were found to have the greatest discriminatory power, revealing the genetic variation of the main group of ropy slime-producing L. sake strains and distinguishing all non-ropy strains from slime-producers.
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