Physico-chemical and microbiological characteristics of honey produced by stingless bees (Meliponula beccarii) from the Oromia Region, Ethiopia

Abstract

The study was designed to characterize the Physico-chemical and microbiological properties of stingless bee honey (Meliponula beccarii L.) in the Oromia Region, Ethiopia. About thirty-nine (39) honey samples were collected from underground soils through an excavation of natural nests. The study revealed that the mean values of physicochemical parameters for honey samples were: moisture content (30.69{+/-}0.29), ash content (0.16{+/-}0.01), electrical conductivity (0.44{+/-}0.2), pH (3.30{+/-}0.03), free acidity (92.39{+/-}4.45), HMF (6.58{+/-}0.36), fructose (36.48{+/-}0.54), glucose (27.67{+/-}0.43),sucrose(1.24{+/-}0.18), maltose (1.2{+/-}0.18) and reducing sugar (64.15{+/-}0.75). Stingless bee honey in this study is characterized as possessing higher moisture content and free acidity, but a lower level of sugar as compared to Apis mellifera honey standard. The occurrence of microorganisms in the stingless honey sample ranged from 2.55 x 10 4 to 1.9 x 103 CFU/ml for Aerobic Mesophilic, 1.68 x104 to 9 x102 CFU/ml for yeast, and 1.8 x103 to 2 x102 CFU/ml for mold. The number of aerobic spore-forming bacteria was at non-detectable levels in all samples while Staphylococci species was detectable only in a sample obtained from Guduru. This indicated that there might be contamination during the harvesting, processing, and storage of stingless bee honey samples. The microbiological and physicochemical properties of stingless bee honey are different from those of A. mellifera honey and need to establish for specific quality standards to promote its commercialization.