研究生: |
陳怡秀 Yi-Hsiu Chen |
---|---|
論文名稱: |
非水相毛細管電泳/77K低溫螢光光譜分析法對逆轉醇Resveratrol之分析研究 On-line Identification of Resveratrol by Nonaqueous Capillary Electrophoresis/Fluorescence spectroscopy at 77K |
指導教授: |
林震煌
Lin, Cheng-Huang |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 124 |
中文關鍵詞: | 非水相毛細管電泳 、77K螢光偵測法 、trans-及cis-逆轉醇 |
英文關鍵詞: | nonaqueous capillary electrophoresis, 77K fluorescence spectroscopy, trans- and cis-resveratrol |
論文種類: | 學術論文 |
相關次數: | 點閱:198 下載:0 |
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" Resveratrol "(3,5,4’-trihydroxystilbene)是一種黃酮類的抗氧化物,存在於許多的天然花果中,尤其以葡萄及紅酒中含量最多。它具有抗氧化的功能,可以有效防止人體機能老化、動脈粥狀硬化、心血管病變以及癌症的發生。市售的葡萄酒中內含的resveratrol有trans-及cis-兩種幾何異構物的存在,雖然所含的cis-resveratrol含量很少,但由於目前我們對cis-resveratrol相關的生物藥理活性仍不甚瞭解,因此有必要將此二種異構物分離。目前最常見的分離方法以HPLC為主,並輔以photodiode array來進行偵測及鑑定。但一般市售組裝的儀器大多只能量得室溫吸收光譜,而在室溫下吸收光譜譜峰又相當寬廣,若在複雜的基質中,難免混雜有相似吸收光譜的物質,造成譜峰判定上的困難。
為了能快速分離且正確判知resveratrol的異構物,本研究開發非水相毛細管電泳層析/超低溫螢光分析法,先以毛細管電泳法分離trans-及cis-resveratrol,當樣品電泳至偵測窗的瞬間冷凍至77 K,以便得到低溫螢光光譜,做為譜峰的確認及更精確的光譜比對。本研究更發現,非水相螢光偵測法比一般使用的水相緩衝溶液在進行分離時,可增強分析物的螢光強度並增加偵測的靈敏度。由實驗結果顯示,使用最佳化的分離條件50 mM SC(Sodium cholate),20 mM醋酸銨(Ammonium acetate),70%甲醇(Methanol),30%氰甲烷(Acetonitrile)的非水相緩衝溶液以及超低溫(77K)螢光法的量測,對於偵測極限有很大的助益,可提高大約150倍。應用於葡萄酒中,可偵測到trans-resveratrol約3.8 ppm的含量。
本研究還開發了零度(0 ℃)以下(subzero)的非水相毛細管電泳分離方式—冰溫分離法,將全長1/3的毛細管至於零下70度的乾冰槽中進行分離。實驗結果顯示,在低溫下分離不僅可增強分析物的螢光強度,相對於一般在室溫下進行的分離更可以提高電泳分離的解析度。結合冰溫分離及on-line螢光77 K光譜偵測法,不僅可以成功地將resveratrol異構物完全分離,更可以獲知個別異構物的77 K螢光光譜。輔以stilbene異構物的標準螢光光譜比對,更可以進一步確認本實驗量得resveratrol螢光光譜的正確性。
This work presents a novel method for the accurate determining trans- and cis-resveratrol (3,5,4'-trihydroxystilbene) by nonaqueous capillary electrophoresis/fluorescence spectroscopy at 77 K. The proposed method permits, not only the separation of resveratrol isomers, but also ensures that on-line spectra are readily distinguishable and unambiguously assigned. The experimental results also indicate that the effect of nonaqueous CE buffer and low-temperature technique increase the detection limit by more than 150-fold.
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