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Permeation decomposition of urea through asymmetrically urease-immobilized ethylene-vinyl alcohol copolymer membranes

✍ Scribed by Takashi Miyata; Atsushi Jikihara; Katsuhiko Nakamae

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 243 KB
Volume: 63
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19970321)63:12<1579::aid-app9>3.0.co;2-l

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✦ Synopsis

Urease-immobilized ethylene-vinyl alcohol copolymer (EVA) membrane was prepared by the covalent bonding of urease on EVA membrane activated with cyanuric chloride. The urease-immobilized EVA membrane had optimum pH at about 7.0 similar to native urease. The Michaelis constant (K m ) and the maximum velocity (V m ) of the urease-immobilized EVA membrane were smaller than those of native urease. When the EVA membrane, prepared on a polyethylene (PE) plate by the phase inversion method, was used as a support, urease was asymmetrically distributed in the direction of cross section of the urease-immobilized EVA membrane. The permeation decomposition of urea through the asymmetrically urease-immobilized EVA membrane depended on the asymmetric distribution of urease in the membrane.

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