Removal of dissolved oxygen by immobilized ascorbate oxidase onto a packaging film

Toshiro Matsui, Toshiaki Nakao, Masaomi Fukamachi, Noriko Shikada, Mitsuya Shimoda, Yutaka Osajima

Research output: Contribution to journalArticle

Abstract

In order to remove dissolved oxygen from liquid food, ascorbate oxidase (AO) was covalently immobilized onto ethylene-vinyl alcohol copolymer (EVOH) film. Maximal activity was observed at pH 6.0, 30°C (1.14 mU/cm2). The immobilized AO still retained a higher residual activity than free AO under practical conditions ; at pH 4.0 corresponding to citrus juice, 10°C and 60°C, the residual activities were 47.8%, 91.3%, and 49.4% whereas those of free AO were 3.1%, 63.3% and 0%, respectively. When the AO immobilized EVOH film was directly in contact with 2.5 mM L-ascorbic acid in 10 mM citrate buffer solution (pH 4.0), more than 85% of dissolved oxygen was removed within 4h. In addition, flavors (d-limonene, linalool, and citral) in the solution were successfully preserved from the oxidative deteriorations ; for d-limonene, the residual ratio (71.6%) with AO immobilized EVOH film was 2.5-fold that with non-immobilized one (29.0%) after 28 days' storage.

Original languageEnglish
Pages (from-to)362-367
Number of pages6
JournalNippon Shokuhin Kagaku Kogaku Kaishi
Volume43
Issue number4
DOIs
Publication statusPublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Food Science

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