Ascorbate oxidase is produced by extraction from plants of the genus Sechium, particularly the species thereof which is Sechium edule Sw. The crushed plant tissues are extracted with an aqueous alkaline solvent, preferably at about pH 11. The extract is then subjected to centrifugation, concentration under vacuum, salting out with ammonium sulfate and solvent fractionation with acetone, to prepare crude ascorbate oxidase, which is then further purified by dialysis, ion exchange chromatography, adsorption chromatography and gel filtration. The ascorbate oxidase thus obtained has an optimum pH of about 7, a km value of 0.3 mM, an isoelectric point of around pH 6.3 and a molecular weight of about 100,000.

sicyos/oxidase

Process for production of ascorbate oxidase

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