Materials and methods
Vetiver root was collected from the research farm of CSIR-CIMAP, Lucknow, India. The plant material was authenticated (CIMAP herbarium No. 8898) by the taxonomists of the Institute and hydro-distillation was carried out for removal of essential oils. The spent and the intact roots were dried under shade at room temperature. After drying, roots were chopped into small pieces and then dipped in ethanol (95%) in a percolator for 3 days at room temperature. Extracts was collected for a week, and then filtered using Whatmann filter paper no. 1 and concentrated at 60 °C under reduced pressure (175 mbar). The liquid–liquid extraction was carried out with organic solvents. The hexane, ethyl acetate and methanol fractions were collected during fractionation of ethanolic extract of root. The separated solvent fractions were concentrated to dryness using a rotavapour. Stock solution of extracts and fractions (100 mg/mL) were made in dimethyl sulfoxide (DMSO). M. tuberculosis H37Rv (ATCC 27294) and M. tuberculosis H37Ra (ATCC 25177) cultures were maintained on Löwenstein–Jensen media slant at 37 °C and antimycobacterial activity was done using BACTEC 460TB system. 11 and 12
Results and discussion
The ethanolic extract and its solvent fractions (hexane, ethyl acetate and methanol) were tested for antimycobacterial activity. The intact and spent roots were found to be active at a minimum inhibitory concentration (MIC) of 500 μg/mL against both the strains of M. tuberculosis ( Table 1). It was observed that roots after hydro-distillation showed similar type of activity as like intact root extract. The strong reduction in GI was observed in hexane fraction of root. Hexane fraction repressed the growth of both strains of M. tuberculosis during 7 days of incubation ( Fig. 1) with MIC value of 50 μg/mL. Ethyl acetate and methanol fractions of plant extracts were unable to show any activity when tested at highest concentration of 1000 μg/mL.
Materials and methods
Vetiver root was collected from the research farm of CSIR-CIMAP, Lucknow, India. The plant material was authenticated (CIMAP herbarium No. 8898) by the taxonomists of the Institute and hydro-distillation was carried out for removal of essential oils. The spent and the intact roots were dried under shade at room temperature. After drying, roots were chopped into small pieces and then dipped in ethanol (95%) in a percolator for 3 days at room temperature. Extracts was collected for a week, and then filtered using Whatmann filter paper no. 1 and concentrated at 60 °C under reduced pressure (175 mbar). The liquid–liquid extraction was carried out with organic solvents. The hexane, ethyl acetate and methanol fractions were collected during fractionation of ethanolic extract of root. The separated solvent fractions were concentrated to dryness using a rotavapour. Stock solution of extracts and fractions (100 mg/mL) were made in dimethyl sulfoxide (DMSO). M. tuberculosis H37Rv (ATCC 27294) and M. tuberculosis H37Ra (ATCC 25177) cultures were maintained on Löwenstein–Jensen media slant at 37 °C and antimycobacterial activity was done using BACTEC 460TB system. 11 and 12
Results and discussion
The ethanolic extract and its solvent fractions (hexane, ethyl acetate and methanol) were tested for antimycobacterial activity. The intact and spent roots were found to be active at a minimum inhibitory concentration (MIC) of 500 μg/mL against both the strains of M. tuberculosis ( Table 1). It was observed that roots after hydro-distillation showed similar type of activity as like intact root extract. The strong reduction in GI was observed in hexane fraction of root. Hexane fraction repressed the growth of both strains of M. tuberculosis during 7 days of incubation ( Fig. 1) with MIC value of 50 μg/mL. Ethyl acetate and methanol fractions of plant extracts were unable to show any activity when tested at highest concentration of 1000 μg/mL.
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