本研究使用在離子液體BMIM-PF6的分布大於水相的染料
Procion Blue MX-R當作萃取劑，可對與其有親和力作用的溶菌酶進行 正向及反向萃取。當離子液體相中的親和性染料濃度愈高時，對蛋白 質的萃取效果隨之提升。此方法與傳統雙水相系統相較之下，由於染 料配體省略了在高分子聚合物上進行修飾（modification)的步驟，因 此較為簡易；同時使用離子液體取代傳統有機溶劑作為萃取相，減少 化學溶劑的揮發，降低了對環境的影響。
本實驗同時測試了Procion Blue MX-R 對其他種類蛋白質是否具 有萃取效果，結果發現，當分別萃取各個蛋白質水溶液時，僅溶菌酶 可被成功萃取，可知本實驗所選擇的染料與蛋白質的作用力具有一定 程度的選擇性。
由於親和性染料和離子液體的種類繁多，選擇適當的染料與疏水 性離子液體，預期能萃取的蛋白質種類將大為增加，為離子液體應用 在蛋白質萃取方面，提供了新的研究方向。
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