Antioxidant and antibacterial activities of multiflora honey extracts from the Indonesian Apis cerana bee

Abstract

Objectives: Honey is an apiary product with various medicinal properties resulting from its bioactive compounds. Here, we aimed to determine the antioxidant and antibacterial properties of the Indonesian Apis cerana honey extracts and their correlation with total phenolic content (TPC) and total flavonoid content (TFC).

Methods: We extracted ethyl acetate-n-hexane and two types of ethanolic extracts from crude honey. Phenols and flavonoid content were calculated using spectroscopy. The antioxidant activity was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric ion reducing antioxidant power (FRAP) assays, and it was reflected via the antioxidant activity index (AAI). An agar diffusion test was used to test the antimicrobial activity.

Results: The ethyl acetate extract of the Karangasem honey provided the highest amount of phenolic and flavonoid content, and the strongest antioxidant activity using DPPH and FRAP assays. The ethanolic honey extracts were active against Bacillus subtilis and Escherichia coli; in this regard, the strongest effect was noticed from the Singaraja honey extract. The positive significant correlations between TPC and AAI were observed in all samples. Similar results also appeared between phenolic and flavonoid compounds and their antibacterial activity in most of the tested samples.

Conclusions: In our study, honey extracts possessed antioxidant and antibacterial activities that were mostly related to the qualitative and quantitative properties of phenols and flavonoids. Geographical origin brought variations in the phytochemical profiles and bioactivities of honey.

Keywords: Antibacterial activity; Antioxidant activity; Apis cerana; Flavonoids; Honey extract; Phenols.