頁籤選單縮合
題 名 | Lipase-Catalyzed Transesterification of Propylene Glycol with Triglyceride in Organic Solvents |
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作 者 | Liu,Kuan-ju; Chen,Shui-tein; Shaw,Jei-fu; | 書刊名 | 中央研究院生物化學研究所論文集 |
卷 期 | 24 1998[民87.] |
頁 次 | 頁55-58 |
分類號 | 361.4 |
關鍵詞 | Emulsifier mixture; Lipase; Organic solvent; Propylene glycol monoester; Monoglyceride; Diglyceride; |
語 文 | 英文(English) |
英文摘要 | A mixture of emulsifiers consisting of propylene glycol monoesters and mono- and diglycerides was obtained when triglycerides were reacted with propylene glycol (1,2-propanediol) using lipase as a catalyst. These emulsifiers were synthesized enzymatically to overcome the problems associated with chemical processes. Typically, lipase was added to a reaction mixture containing propyiene' glycol and acyl donors (tripalmitin, tristearin, and triolein) in various organic solvents containing tert-butyl alcohol and molecular sieves. The mixture was incubated in an orbital shaker at a speed of 250 rpm at 40 ℃. This study showed that among the eight lipases tested the lipase PS from Pseudomonas cepacia was the most effective in synthesizing these emulsifiers by a transesterrScation process. The anhydrous enzyme and hydrophobic organic solvents were favored for the production of propyiene glycol monoesters and mono- and diglycerides. The yields of monoesters and monoand diglycerides were also affected by temperature, pH memory, propylene glycol/triglyceride ratio, reaction time, and immobilized lipase. The yields of propyiene glycol monopalmitate could be increased to 74.6% by the addition of molecular sieves and cosolvents. Lipase immobilization increased the catalytic efficiency up to 5-foid. |
本系統中英文摘要資訊取自各篇刊載內容。