| Abstract: | 本論文主要是利用矽氧烷化合物（siloxanes）經由溶膠-凝膠程序（sol-gel process）製備一系列具有磺胺劑（sulfonamides）辨識效果之分子拓印高分子（molecularly imprinted polymers, MIPs），並有系統的研究分子拓印高分子的各種不同製備條件與其合成步驟，且進一步的探討分子拓印高分子的各種性質和孔洞特性。 本論文包含三個部份各別加以討論，第一部份主要以四甲氧基矽烷（tetramethoxysilane, TMOS）和一甲基三甲氧基矽烷（methyltrimethoxysilane, MTMOS）製備具有磺胺類辨識效果之溶膠－凝膠分子拓印高分子。並利用高效能液相層析儀偵測模板分子磺胺二甲嘧啶（sulfamethazine, SMZ）與其相似物磺胺甲噁唑（sulfamethoxazole, SMO）在不同酸鹼值下的吸附量與選擇率。探討其分子拓印高分子的製備條件，不同的R值、不同酸鹼值的競爭吸附、不同的鍛燒溫度以及不同TMOS 和MTMOS的莫爾分率。由實驗結果顯示，當競爭吸附水溶液在pH=7.4測得的吸附量會比在pH=4.6時高，且第二階段鍛燒溫度控制在375°C，會得到較高的選擇率。當在最佳的製備條件下，分子拓印高分子的選擇率會比非拓印高分子還要大約多六倍。 第二部份主要利用一步驟（single-step）溶膠-凝膠法製備一系列以四乙氧基矽烷（tetraethoxysilane, TEOS）為主體，具有磺胺類辨識效果之分子拓印高分子。探討其分子拓印高分子的製備條件，不同的R值、不同酸鹼值的競爭吸附和各種的鍛燒的程序。由實驗結果顯示，當競爭吸附水溶液在pH=7.4測得的選擇率會比在pH=4.6時高，當鍛燒溫度提升，且鍛燒時間增加，模板分子的選擇率也會隨之增加。在最佳的製備條件下，分子拓印高分子的辨識效果會比非拓印高分子高大約七倍。 第三部分主要探討以四乙氧基矽烷（tetraethoxysilane, TEOS）為主體，利用二步驟（two-step）溶膠－凝膠法製備具有磺胺類辨識效果之分子拓印高分子。並討論分子拓印高分子的製備條件，不同的吸附時間、不同酸鹼值的競爭吸附、氨水的添加量和各種的鍛燒的程序。實驗結果顯示，當競爭吸附水溶液在pH=7.4測得的吸附量和選擇率，皆會比在pH=4.6時高。且當鍛燒時間增加，模板分子的吸附量會降低但是選擇率會增加。在最佳的製備條件下，分子拓印高分子的辨識效果會比非拓印高分子大約多八倍。 The main propose of this dissertation is to prepare a series of the molecularly imprinted polymers (MIPs) based on siloxanes for recognized sulfonamide by sol-gel process and to investigate systematically their preparation conditions and the various synthesis procedures. Furthermore, the fundamental properties and the pore properties were also studied. This dissertation contains three parts as follows: in first part, the sol-gel molecularly imprinted polymers based on tetramethoxysilane (TMOS) and methyltrimethoxysilane (MTMOS) for recognized sulfonamides were prepared. The MIP’s preparation conditions includes, the H2O/Si molar ratios (R), pH value of competition solution, calcination temperature, and the TMOS and MTMOS molar fractions are discussed. Adsorption and selectivity in different pH solutions were determined by competition experiments between the MIP template (sulfamethazine, SMZ) and the analogue (sulfamethoxazole, SMO) using HPLC. The results showed that the selectivity of the competition solution with pH=7.4 was higher than those with pH=4.6. In addition, the second stage temperature of calcination, which was carried out at 375°C, was obtained high selectivity. Moreover, the selectivity of the MIP (21.8) was approximately six times greater than the non-imprinted polymer (3.85) under the optimum preparation conditions. In second part, the synthesis of a molecularly imprinted polymer (MIP) composed of tetraethoxysilane (TEOS) for recognized sulfonamides using a single-step sol-gel process has been developed. The MIP’s preparation conditions includes, the H2O/Si molar ratios (R), pH value of competition solution, and the calcination process are discussed. The results showed that the selectivity of the competition solution with pH=7.4 was higher than those with pH=4.6. In addition, the selectivity of SMZ increased as the calcination time and the calcination temperatures were increased. Moreover, the selectivity of the MIP (56.2) was approximately seven times greater than the non-imprinted polymer (8.32) under the optimum preparation condition. In third part, the synthesis of molecularly imprinted polymer (MIP) composed of tetraethoxysilane (TEOS) for recognized sulfonamides using a two-step sol-gel process was investigated. The MIP’s preparation conditions such as, the various adsorption time intervals, the amount of NH4OH and the calcination temperature process are discussed. The results showed that the adsorption and selectivity of the competition solution with pH=7.4 were higher than those with pH=4.6. In addition, the adsorption of SMZ decreased but its selectivity increased while the calcination time was increased. Moreover, the selectivity of the MIP (51.3) was approximately eight times greater than the non-imprinted polymer (6.55) under the optimum preparation condition. |
