Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 68, Issue 11, Pages 2346-2352Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.68.2346
Keywords
honeybee alpha-glucosidase; honey alpha-glucosidase; source of honey alpha-glucosidase
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Three kinds of alpha-glucosidases, I, II, and III, were purified from European honeybees, Apis mellifera L. In addition, an et-glucosidase was also purified from honey. Some properties, including the substrate specificity of honey a-glucosidase, were almost the same as those of alpha-glucosidase III. Specific antisera against the alpha-glucosidases were prepared to examine the localization of alpha-glucosidases in the organs of honeybees. It was immunologically confirmed for the first time that alpha-glucosidase I was present in ventriculus, and alpha-glucosidase II, in ventriculus and haemolymph. alpha-Glucosidase III, which became apparent to be honey alpha-glucosidase, was present in the hypopharyngeal gland, from which the enzyme may be secreted into nectar gathered by honeybees. Honey may be finally made up through the process whereby sucrose in nectar, in which glucose and fructose also are naturally contained, is hydrolyzed by secreted alpha-glucosidase III.
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