Isolation of a pure dextranase from Penicillium funiculosum.

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  • 1 September 1970
    • journal article
    • Vol. 20  (3) , 421-6
Abstract
A dextranase, produced by Penicillium funiculosum, was purified 1,000-fold to yield the enzyme which was demonstrated by gel electrophoresis and electrofocusing to be a homogeneous protein. The purification method included acetone partition, ammonium sulfate fractionation, gel filtration, iron defecation and precipitation, and diethylaminoethyl-cellulose chromatography. The pure enzyme was also obtained by preparative gel electrophoresis. Gel-permeation chromatography indicates a molecular weight of 41,000. An isoelectric pH of 4.6 was established by electrofocusing. A 1-mg amount of the enzyme hydrolyzes a dextran substrate to yield 27,000 isomaltose reducing units in 2 hr.