Comparison of the chemical composition and bioactive properties of extracts prepared from the mature Turkish and Brazilian banana peels

The banana (Musa sp.) plant grows in tropical and subtropical regions. The fruit of the banana is eaten and the peel of the banana is discarded. In this study, chemical analyzes (HPLCTOF/MS ve GC-MS) and biochemical activities (antioxidant and antimicrobial) of ethyl acetate (Ea) and methanol/chloroform (Me/Ch) extracts prepared from banana peel (Bbp) grown in Brazil and banana peel (Tbp) grown in Turkey were investigated. Cetene, 4-hydroxybenzoic, palmitic, linoleic, stearic, gentisic and syringic acid are the most abundant compounds in the extracts. The total antioxidant activity of Tbp-Ea (A0.5: 36.84 μg/mL), inhibition of lipid peroxidation of Bbp-Ea (IC50: 3.22 μg/mL), reducing power of Tbp-Me/Ch (A0.5: 4.96 μg/mL), DPPH• scavenging activity of Bbp-Ea (IC50: 8.54 μg/mL), metal chelating activity of Tbp-Ea (IC50: 16.54 μg/mL) and H2O2 scavenging activity of TbpMe/Ch (IC50: 0.36 μg/mL) were found the most effective. It was exhibited that extracts were effective against gramnegative and gram-positive bacteria. In conclusion, the phytochemical and biochemical results of the TbP and Bbp extracts will contribute further pharmacological, biochemical and pharmacological investigations.