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A novel method for preparing enzyme membranes was developed. The enzyme was attached onto the electrode surface by dropping the enzyme solution and allowing it to dry. Glucose oxidase was used for entrapment. Then, the electrode surface was coated with an ionic liquid containing cellulose, and the ionic liquid was removed by immersing the electrode into water. Enzyme activity was retained in the membrane; the enzyme electrode can be used for detecting glucose in the range of 10 µM to 1 mM, and the response time was ~10 s. The stability duration of the electrode was examined: the enzyme electrode could be used for glucose detection for 6 months. The membrane was observed by atomic force microscopy in the force modulation mode; crystalline and amorphous parts were intermingled. In conclusion, the cellulose membrane can be a suitable immobilization matrix for enzymes.

Preparation of a Cellulose-based Enzyme Membrane Using Ionic Liquid to Lengthen the Duration of Enzyme Stability