Résumé
Among different bacterial cultures, a potent Bacillus subtilis MTCC-8114 was isolated from garden soil samples which showed 16 and 14 mm inhibition zones by spot inoculation method and 24 and 22 mm inhibition zones by well agar diffusion method against test fungi i.e. Microsporum fulvum and Trichophyton species. Among four media tested, the maximum growth and antibiotic production was found in trypticase soya broth (TSB) medium at 37 degrees C, pH-7 and 48 h of incubation. The Rf value (0.64) by Thin Layer Chromatography (TLC) technique and UV and FTIR spectral data of the active antifungal compound, indicated that the isolated compound belongs to peptide antifungal antibiotic group. MIC value of antifungal antibiotic was 135 and 145 microg/ml.
Sujets)
Antifongiques/biosynthèse , Antifongiques/pharmacologie , Bacillus subtilis/effets des médicaments et des substances chimiques , Bacillus subtilis/croissance et développement , Bacillus subtilis/métabolisme , Milieux de culture , Tests de sensibilité microbienne , Microsporum/effets des médicaments et des substances chimiques , Biosynthèse des peptides/effets des médicaments et des substances chimiques , Lutte biologique contre les nuisibles , Spectrophotométrie UV , Spectroscopie infrarouge à transformée de Fourier , Trichophyton/effets des médicaments et des substances chimiquesRésumé
A potent Bacillus subtilis-2 isolated from soil samples, showed 14 mm inhibition zone by spot inoculation method and 22 mm inhibition zone by well agar diffusion method against pathogenic test fungii. i.e. Trichophyton species. Among four media tested, the maximum growth and antibiotic production was found in trypticase soya broth (TSB) medium at 37 degrees C, pH 7 and 48 hrs of incubation. The MIC of antifungal substance was 35 microl/ml. The isolated Bacillus subtilis -2 has strong antifungal activity against dermatophytic fungi Trichophyton sp. and requires chemical characterization for its bioactive principle.