Antimicrobial and the total antioxidant activities of the methanolic extract of allanblackia floribunda fruit

The role of natural products, especially medicinal plants in the treatment of various ailments cannot be overemphasized, several plants have being investigated for their medicinal values. Different parts of Allanblackia floribunda tree is being used locally for the treatment of diseases, in this study, the antimicrobial activities of the methanol extracts of the seed, pulp and peel of Allanblackia floribunda fruit were tested against Ten (10) strains of bacteria including six (6) Gram-negative isolates; Escherichia coli, Proteus vulgaris, Klebsiella pneumonia, Salmonella typhi, Shigella sp. and Pseudomonas aeruginosa, and four (4) strains of Gram-positive; Staphylococcus aureus, Bacilluscereus, Micrococcus luteus and Streptococcus pneumonia. Different concentrations of the methanol extracts of each part of the fruit exhibited different antibacterial actions in a dose dependent manner against most of the tested organism.In order to investigate the phenolic content of the pulp, peel and seed of Allanblackia floribunda, the total polyphenol content of the methanol extracts of each part was determined. The total polyphenol content of the methanol extract of the peel (251.3 mg/g) was significantly (p<0.05) higher than the pulp (78.92mg/g) and both are significantly higher than the methanol extract of the seed (5.56mg/g). The polyphenol content of Allanblackia floribunda fruits reduces as we go from the peel to pulp and the seed. This results correlated well with the ferric reducing antioxidant power (FRAP), trolox equivalent antioxidant capacity and oxygen radical absorbance capacity (ORAC) assay carried out on the three parts. This indicate that the antioxidant capacity is related to an additive effect of various polyphenols in the extract.