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Abstract
Seven plant species i.e., Adhatoda vasica, Andrographis paniculata, Azadirachta indica, Lawsonia inermis, Moringa oleifera, Ocimum sanctum and Trigonella foenum‐graecum have been screened out systematically for their effectiveness in inhibition of bacterial population of raw water (in vitro) at variable pH level i.e., 6.0, 6.5, 7.0, 7.5 and 8.0. Maximum percentage inhibition was observed in three plant species at 6.5 pH level while in four plant species at 7.0 pH level. Among all the studied plants, maximum inhibition was recorded in case of L. inermis (93.97%) which was followed by M. oleifera (89.72%) and A. vasica (81.75%). In order of maximum to minimum inhibition, individual plant species depicted their effectiveness in the following manner : L. inermis > M. oleifera > A. vasica > A. indica > O. sanctum > A. paniculata > T. foenum‐graecum. Besides, MPN coliform and E. coli were also inhibited maximum at 7.0 pH level by the extract of L. inermis which was followed by A. vasica and M. oleifera at 6.5 pH level. Hence, these plant species may be used for elimination of bacterial contaminants of raw drinking water obtained directly from the sources to reduce the occurrence of different water borne diseases.
