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Dextran was formed on the surface of hydroxyapatite by the enzymatic reaction of dextransucrase to control protein adsorption. The hydroxyapatite substrate was immersed in a dextransucrase solution (0.3U/mL, pH 5.5) to immobilize dextransucrase to the hydroxyapatite surface at 6.0U/mL. The dextransucrase-immobilized hydroxyapatite was then reacted with a sucrose substrate to generate dextran from...