Effect of supplementary honey and artificial sugar feeding of bees on the composition of royal jelly

R. Balkanska, I. Zhelyazkova, M. Ignatova, B. Kashamov
Abstract. The purpose of this study was to assess the effect of supplementary honey and artificial sugar feeding of bees on the composition of royal jelly. A total of 29 royal jelly samples were harvested and analyzed from May to August 2012. The results obtained show the following values for royal jelly samples harvested from bee colonies fed with sugar solution: water content (58.30–63.50%), proteins (15.04–18.79%), fructose (4.30–6.91%), glucose (2.87–4.43%), sucrose (1.39–4.19%), pH (3.65–4.18), total acidity (3.69–4.46 ml 0.1 N NaOH/g), electrical conductivity (166.00–214.00 μS/cm). The respective physicochemical parameters in royal jelly samples produced by feeding with honey were: water content (59.70–63.70%), proteins (15.28–18.53%), fructose (3.96–6.74%), glucose (2.64–4.49%), sucrose (1.40–3.87%), pH (3.76–4.19), total acidity (3.69–4.66 ml 0.1 N NaOH/g), electrical conductivity (174.00–191.00 μS/cm). Statistical analysis showed no significant differences between the physico-chemical parameters (water content, proteins, fructose, glucose, sucrose, pH, total acidity, electrical conductivity) in the feeding experiment. These data show that the studied types of feeding do not influence the royal jelly composition. These results, however, are not only essential from scientific point of view. They have also practical purposes and are important for beekeepers who produce royal jelly.

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