研究生: |
林進益 Chin I Lin |
---|---|
論文名稱: |
有機無機混成分子拓印高分子材料與生化感測器之應用 Organic/Inorganic Hybrid Molecularly Imprinted Polymers And Biosensor Applications |
指導教授: |
李 育 德
Yu Der Lee |
口試委員: | |
學位類別: |
博士 Doctor |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 181 |
中文關鍵詞: | 分子拓印 、有機無機混成 、生化感測器 |
外文關鍵詞: | Molecular Imprinting, Organic/Inorganic Hybrid, Biosensor |
相關次數: | 點閱:2 下載:0 |
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大部份分子拓印(molecular imprinting)合成技術皆為有機材料為主,以有機無機混成材做為架構,辨識位址處則保留辨識效果較好的有機官能基,此種有機-無機共混成的方式所製備之分子拓印材料,不但保有原來有機材的易加工、低密度的優點,也同時兼有無機材料熱穩定、良好光學及機械性質等特性。材料穩定及低的製造成本,使得此種材料在工業級產品應用上面受到更多的注意。而使用溶膠凝膠合成技術為一快速方便隨意溫度皆可製備之方法。
本研究採用兩種不同分子拓印方法;非共價鍵方式及共價鍵方式建構識別性吸附孔洞。探討影響模版再鍵結因素,包括:模版/單體比率,官能性單體與造孔溶劑種類,反應溫度與時間等。並以咖啡因及其相似物,作為分子拓印材料選擇性吸附能力研究。初步研究結果顯示分子拓印高分子材料合成最佳組成,在表面封端情況下(end capped)以CAF:MAA:VTEOS:TEOS=1: 4 ~ 8: 20: 30 (mmol)時,達最佳選擇性與最佳吸附量。然而因表面封端將去除非辨識能力之silanol基,造成整體吸附量降低。在乙醇中膠化可使材料較透明,選擇性最佳,對theophyllline之親和力最低。分子拓印高分子材料對咖啡因溶液之吸附處理時間以一小時最佳,過長之吸附處理時間將降低其辨識能力,且六十分鐘達最大飽和吸附量,而溫度越低吸附量越大。
本研究另建立以共價型拓印為主的共聚合技術,以膽固醇(cholesterol)為模版分子(template molecule),利用溶膠凝膠聚合方式製備能辨識及吸附膽固醇的高分子顆粒材料。本研究選擇膽固醇做為模版分子,並且以cholesteryl (4-vinyl) phenyl carbonate與vinyltriethoxysilane(VTEOS)及3-(Methacryloyloxy) propyltrimethoxy silane(MPS)反應形成之共聚合高分子做為官能性單體。此共聚高分子與烷氧基金屬(metal alkoxide)進行溶膠-凝膠步驟後,生成外觀如陶瓷般,且具奈米通道之有機-無機共混成材料。另對聚合的方式、配方及條件作深入的實驗探討,以獲得高穩定性、高吸附容積的聚合物為目標。目前結果顯示吸附膽固醇達56%以上,在條件不同下將會有更佳的吸附效果。
在生物感測器應用研究上,本研究為利用分子拓印技術與半導體微粒(Semiconductor Nanoparticles,CdSe@ZnS)成型技術,將analyte(咖啡因caffeine) 拓印至高分子載體上,再利用螢光發光光譜(Photoluminescence) 技術偵測 analyte 之種類與濃度。由實驗結果發現量子點其放射光譜,深受所接受部位拓印模版分子所影響;在再鍵結實驗中,螢光發光光譜降低了五倍放射強度,此為量子點的放射光譜強度被抑制,所觀察到的抑制效應是由於螢光共振能的轉移,這是由於量子點和緊鄰鍵結分子的能量傳遞效應(fluorescence resonance energy transfer,FRET)。這種現象可以進行競爭性的分子拓印分析,因為當類似物(theobromine)分子出現時並不會影響半導體奈米微粒的光譜放射性質。相似的結果同樣顯示於另一類似物theophylline,證明拓印分子對於模版分子有高度的選舉性。在另外模版分子研究上,如尿酸等也具有同樣效果。
Most investigations for the preparation of imprinted polymers were carried out using purely organic polymers. Organic-inorganic hybrid materials have been found to be highly advantageous as they exhibit flexibility, low density and long shelf life with excellent optical and mechanical properties. The stability and low manufacturing cost makes these hybrid polymers amenable for industrial applications. A synthetic methodology based on sol-gel process, which is one of the fastest emerging fields of material chemistry, is a convenient one for material preparation from organic precursors at ambient temperature.
We have adopted two different approaches based on covalent and non-covalent bond interactions with the template molecule. Factors that influenced rebinding of the imprinted polymer including template/monomer ratio, functional monomers, porogenic solvents, temperature and time were explored. The binding selectivity of the MIPs for caffeine and its analogous structures were also discussed. A molar ratio of 1: 4 ~ 8: 20: 30 between CAF: MAAM: VTMOS: TEOS showed maximum of caffeine adsorption capacity whilst the corresponding end capped materials showed better selectivity also. However, the overall capacity reduced considerably because the lack of non-specific interactions due to surface silanol groups. Gel formed in presence of ethanol was more transparent in appearance with maximum selectivity and least affinity towards theophyllline. Prolonged treatment time of MIPs with caffeine solution led to reduction in recognition properties and the optimum was found to be one hour. Saturation of sites reached within 60 minutes. The MIPs showed a maximum adsorption capacity for caffeine at low temperature conditions. So it is advisable to conduct the incubation at low temperature for a maximum of one hour using end capped MIPs samples.
For covalent bond interactions with the template molecule, we aim at establishing the technology of polymerization via covalent imprinting, in which cholesterol was employed as the template. The sol-gel polymerization of the complex formed from cholesterol-bound functional monomer and cross-linker were investigated experimentally in detail. The state of the art was achieved by using cholesterol as the template molecule. Several types of cholesteryl (4-vinyl) phenyl carbonate copolymers with vinyltriethoxysilane (VTEOS) or 3-(Methacryloyloxy) propyltrimethoxy silane (MPS) were prepared for cholesterol imprinting. The aforementioned copolymers subjected to sol-gel process with metal alkoxide was generated a hither-to-unknown series of organic - inorganic hybrid materials with nanometer-order ceramic texture. Every effort on the study of polymerization conditions was made to prepare an ideal MIPs, which has a higher stability and adsorption capacity (56%). The technology developed in this study will be very helpful for marketing the molecularly imprinted polymers.
In biosensor application study we have demonstrated a novel method for molecular sensing. Synthetic host molecules were made from functionalized CdSe@ZnS nanoparticles by a molecular imprinting process(CdSe@ZnS/MIP-caffeine). The re-binding experiment of Qdot-MIPs showed a five-fold reduction in emission intensity in its photoluminescence behavior. The observed quenching effects are due to fluorescence resonance energy transfer (FRET), which involves radiationless energy transfer that occurs between QDots and tightly bound guest molecule. The Qdot-MIPs also show a very good selectivity between caffeine and its analogues. The emission intensity of Qdot-MIP is found to be unaffected after the re-binding experiment with theobromine. A similar behavior was observed with theophylline, analogues of caffeine, also. The imprinted sites are highly selective for the template molecule. This was consistent and highly reproducible in the case of other print molecules like uric acid, etc.
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