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題 名 | 水份含量對於連續式超臨界二氧化碳下之酵素性酯化反應的影響=Effect of Water on Continuous Enzymatic Synthesis of Phenylethyl Acetate in Supercritical Carbon Dioxide |
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作 者 | 邱郁雯; 廖怡禎; 孫璐西; | 書刊名 | 中國農業化學會誌 |
卷 期 | 37:1 1999.03[民88.03] |
頁 次 | 頁87-94 |
分類號 | 346.78 |
關鍵詞 | 酵素反應; 超臨界二氧化碳; 水份含量; 酯化反應; 醋酸苯乙酯; Enzymatic reaction; Supercritical carbon dioxide; Water content; Esterification; Phenylethyl acetate; |
語 文 | 中文(Chinese) |
中文摘要 | 本實驗以脂酵素Lipase PS在連續式超臨界二氧化碳下進行苯乙酸醋酸的酯 化反應,生產在麴釀酒中賦予酒中微甜醇櫫的滋味,及玫瑰花香的醋酸苯乙酸。整個 連續性酯化反應中,水份含量為最關鍵的影響因子,因此,先利用方程式計算出不同 溫度及壓力下水份在超臨界二氧人碳下之溶解度,再探討以不同的操作方式,如改變 溫度、酵素用量等,以達到增加酯類的產量並增加系統對水份之容忍度。實驗結果得 知溫度影響酵素的水份含量與酵素反應活性為最主要的因子,而最適條件為Lipase PS在溫度50℃及壓力2500psi下,可以將反應溶液的水含量提高至15%,且醋酸苯 乙酸之轉化率可以達到90%以上,並持續禾應三天以上。 |
英文摘要 | The intention of this research was to examine the esterification of phenylethanol with acetic acid in supercritical carbon dioxide (SCCO��) for the synthesis of phenylethyl acetate, the major flavor compound in Chinese koji style fermented wine. The reaction was carried out in a continuous mode with attention paid to the effect of water on the enzyme activity. Several parameters were studied in order to optimize the activity and the water tolerance of the enzyme. The effects of the reaction temperature and quantity of the enzyme were examined in order to optimize the conversion rate of the ester and the tolerance of the enzyme to the water content in the reaction system. The results showed that at 50 ℃ and 2,500 psi, Lipase PS can withstand 15% (w/w) water in the reactant for more than three days, and that the conversion rate can reach 90%. |
本系統中英文摘要資訊取自各篇刊載內容。