Published in Scientific Bulletin. Series F. Biotechnologies, Vol. XIX
Written by Tsvetanka TENEVA-ANGELOVA, Dora BESHKOVA
It was examined the possibility for growth of representatives from genera Enterococcus and Streptococcus, isolated from different parts of the herbs Salvia and Geranium in the presence of relevant crude plant extracts. There have been established relationships between the type and concentration of the herbal extracts and tested microorganisms. It was determined a resistance profile of examined lactic acid bacteria against the effect of natural plant extracts. It was established that Streptococcus thermophilus and Enterococcus faecium (isolated from Geranium) grow in the presence of extract of Geranium sanguineum L. in concentrations up to 30 mg/ml whereas some strains S. thermophilus and Ent. faecium (isolated from Salvia) show higher resistance - in range of 30 mg/ml to 100 mg/ml extract of Salvia officinalis L. This is an evidence of selective inhibitory activity of plant extracts to examined lactic acid bacteria and it is a prerequisite for their incorporation in food fermentation that have a lot of economic value, as well as in helping improve human health.
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Geranium
