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(A) Storage stability of glucose oxidase immobilized LbL films: (a) stored in water at 25 °C, (b) stored in 0.1 M PIPES buffer (pH 7) at 4 °C, and (c) allowed to stand in air at 4 °C. (B) Thermostability of the enzymatic activity for LbL assembled films: (a) free glucose oxidase measured immediately; (b) free glucose oxidase after 30 min; (c) glucose oxidase in LbL film measured immediately; (b) glucose oxidase in LbL film after 30 min
