Molecularly Imprinted Polymeric Beads for Decaffeination

日常生活中所喝的茶、咖啡中皆含有咖啡因，但是咖啡因卻對人體具有刺激性。以一般傳統方法將咖啡因移除時，往往也會將飲品中的咖啡因移除，而使其失去原有風味。在本文中，我們利用分子拓印選擇性吸附方式將咖啡因移除。本實驗選擇MAA/EGDMA共聚高分子系統，以水當作分散相。至於MAA以及咖啡因在水中高溶解度的問題，則以加入過量的MAA和咖啡因來解決。實驗結果顯示，MIP小球大小約96µm，吸附力大約為0.32 µmol/g。此種合成方式步驟簡單，不需要在高溫下進行反應、不需要經過研磨過篩等複雜步驟、也不需要以昂貴的全氟碳化物來當作溶劑；這些優點使得這種合成MIP方式在未來應用上，具有很大的潛力。

關鍵字

咖啡因；分子拓印；懸浮聚合

並列摘要

Caffeine, which is found in beverages like coffee, tea and cocoa etc., is the substance that keeps us awake and pronounced drug having many side effects. Unfortunately, the existing technology for caffeine removal will sweep away the pleasant aromas and flavors. A new methodology for molecular imprinting of caffeine has been developed successfully based on suspension polymerization. Most imprinted polymers are prepared by bulk polymerization that are then ground and sieved to produce particles of the desired dimensions. In this study, Methacrylic acid (MAA)-Ethylene glycol dimethacrylate (EDMA) copolymer beads imprinted with caffeine have been prepared by suspension polymerization using water as a dispersing medium. We have taken excess amounts of caffeine and MAA in order to compensate its lose due to the high solubility in water. We could obtain beads having average size of 96 µm with an adsorption amount of 0.32 µmol/g, which is relatively a high value. Unlike MIPs made by other methods the beads obtained in this technique has the advantages such as no complicated grinding and sieving, no use of expensive fluorocarbon solvent and high reaction temperature. The as made imprinted beads do have significant potential for future applications.

並列關鍵字

Caffeine ； Molecular imprinting ； Suspension polymerization

國際替代計量

Molecularly Imprinted Polymeric Beads for Decaffeination

全文下載

主題瀏覽