本實驗以咖啡因做為模板分子，將其溶解在幾丁聚醣溶液中，烘乾成膜後，再以戊二醛交聯。之後，將咖啡因洗出，作成分子拓印薄膜。除了測試在不同環境下(pH及溫度)的膨潤值外，同時測試薄膜在37℃水溶液中對咖啡因的吸附量及釋放行為，結果中顯示出經過咖啡因拓印之幾丁聚醣薄膜擁有較高的平衡吸附量和較慢的釋放速率。其釋放行為符合一階動力模式。 The template molecule of caffeine was dissolved in chitosan aqueous solution. After oven drying, a membrane was formed and subsequently crosslinked with glutaric-dialdehyde. Then, caffeine was washed out to prepared molecular imprinting membrane. The swelling ratio of the prepared membranes was tested in different environmen(pH value, temperature). In addition, the adsorption capability and the release behaviors of caffeine were studied in an aqueous solution at 37 degree C. The experiment results showed the molecular imprinting membrane had higher equilibrium adsorption quantity and lower release rate than the untreated CS membrane. It' srelease behaviors was fitted with first-order kinetic model.