比较甲醇钠、乙醇钠、异丙醇钠和叔丁醇钠催化活性，叔丁醇钠为最佳的催化剂。
Compared with the activity of sodium methoxide, sodium ethoxide, sodium isopropyl, sodium tert-butoxide, the best base catalyst was sodium tert-butoxide.
摘要目的：建立一种气相色谱法同时测定注射用青霉素钠中有机溶剂丁醇、乙酸乙酯、乙酸丁酯残留量的方法。
To found a method to detect the residual solvents of penicillin sodium for injection: butanol acetic ether and butyl acetate.
前言：目的：建立一种气相色谱法同时测定注射用青霉素钠中有机溶剂丁醇、乙酸乙酯、乙酸丁酯残留量的方法。
Objective: to found a method to detect the residual solvents of Penicillin Sodium for Injection: butanol, acetic ether and butyl acetate.
建立了采用直接进样毛细管气相色谱法测定头孢哌酮钠中丙酮和正丁醇残留量的方法。
A capillary gas chromatographic method with directly sampling is established to determine the residual amount of acetone and n-butanol in cefoperazone sodium.
研究了以磷酸二氢钠为催化剂，冰乙酸和异丁醇为原料合成乙酸异丁酯，确定了酯化反应最佳条件。
Based on the composition of iso-butyl acetate by using sodium dihydrogen phosphate as catalyst, acetic acid and 2-butanol as raw materials, the optimum conditions were determined.
在一水硫酸氢钠催化下由柠檬酸和正丁醇合成了柠檬酸正丁酯。
The tri-n-butyl citrate was synthesized by esterification of citric acid with butyl alcohol in the catalysis of sodium bisulfate.
研究结果表明鲍姆木层孔菌正丁醇萃取物可以有效延缓叠氮钠引起PC12细胞衰老。
The results indicate extracts of Phellinus baumii can delay the senescence of PC12 induced by NaN3.
研究结果表明鲍姆木层孔菌正丁醇萃取物可以有效延缓叠氮钠引起PC12细胞衰老。
The results indicate extracts of Phellinus baumii can delay the senescence of PC12 induced by NaN3.
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