ANTIBACTERIAL ACTIVITY OF DROSERA ROTUNDIFOLIA L. AGAINST GRAM-POSITIVE AND GRAM-NEGATIVE BACTERIA

Abstract

The medicinal use of genus Drosera, as an important antitussive for different respiratory diseases, has been known for centuries. Many of extracts from carnivorous plants exhibit various antibacterial and antifungal activities. Naphthoquinones containing extracts from Drosera have antiviral, antibacterial, antifungal, aphrodisiac, antispasmodic, antileprosy, antisclerotic and anticancer properties. The aim of the present study was to detect antibacterial activity of Drosera rotundifolia against Gram-positive and Gram-negative bacteria by the testing of MIC. For the study six strains of microorganisms were selected and there were Gram-positive bacteria -Bacillus thuringiensis (CCM 19T), Clostridium perfringens (CCM 4991), and Listeria monocytogenes (CCM 4699), as well as and Gram-negative bacteria - Escherichia coli (CCM 3988), Salmonella enterica subsp. enterica (CCM 3807) and Yersinia enterocolitica (CCM 5671). Plant extracts were isolated from three plants of Drosera rotundifolia L. (S1, S2 and S3) in different time range. The most effective extract with MIC50 value of 17.07 μg.ml-1 was S3, while forMIC90 of 19.05 μg.ml-1 were extracts S2 and S3 exhibiting antimicrobial activity against Bacillus thuringiensis, Clostridium perfringens and Listeria monocytogenes. Extracts S1, S2 showed MIC50 value 25.53 μg.ml-1for all the microorganism tested, but S3 extract revealed the same antimicrobial activity against Yersinia enterocolitica, Salmonella enterica subsp. enterica and Escherichia coli. Extract S1 has MIC90 value of 27.14 μg.ml-1 against all the microorganism tested, but S2 and S3 shared the same MIC90 for Yersinia enterocolitica, Salmonella enterica subsp. enterica and Escherichia coli.