Abstract
SummaryThe presence of β-galactosidase in the honeybee is reported here for the first time: activity was found in midgut homogenates of the adult worker. When lactose was used as the substrate, honeybee β-galactosidase at 37°C was most active at pH 4·0–5·0, when hydrolysis of lactose was completed in 60 min. The gut β-galactosidase showed a temperature optimum of 37°C, and was not stable at room temperature. The β-galactosidase had a Km constant at 24 mM. The significance of the low activity of bee β-galactosidase in relation to the natural diets of honeybees is discussed.
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