Abstract—In-vitro antagonist tests such as disc diffusion and minimum inhibition concentration (MIC) were conducted against C. gloeosporioides. 1H-NMR coupled with multivariate statistical analysis was carried out to identify possible compounds produced. Glucose crude extract exhibited the highest percent inhibition of radial growth (PIRG) with 75% and the lowest MIC value with 78 µg mL-1. For metabolomics, different metabolites produced were clustered according to the carbon sources used and gave a representative impression of the metabolites produced by P. oxalicum T3.3. The study has shown the potential of using a combination of 1H-NMR spectroscopy and multivariate statistical analysis and their correlation with MIC in differentiating the effect of carbon sources used based on the identification of possible metabolites contributing to their differences. Findings from this work may potentially provide the basis for further studies on both antimicrobial activities against plant pathogen and elucidation of the metabolite compounds produced by P. oxalicum T3.3.
Keywords—Colletotrichum gloeosporioides, metabolomics, Partial Least Square (PLS), Penicillium oxalicum.
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