کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1267079 | 972317 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Improved synthesis of sucrose fatty acid monoesters under ultrasonic irradiation Improved synthesis of sucrose fatty acid monoesters under ultrasonic irradiation](/preview/png/1267079.png)
Sucrose fatty acid esters were synthesized by the transesterification of sucrose with aliphatic esters under ultrasound irradiation in good yield (⩾73%). The optimum reaction conditions for the transesterification reaction include a molar ratio of sucrose to fatty acid ethyl ester of 2:1 and the use of a 13% mol anhydrous K2CO3 catalyst. The optimum reaction temperature was set at 70 °C, the optimum reaction time was 2 h, and the optimum reaction pressure was 11 kPa. The reaction had excellent monoester selectivity. The proportion of monoester (6-monoester + 6′-monoester) in the purified products was up to 92–95% via flash column chromatography over silica gel, the ratios of 6-monoester/6′-monoester are 2.1–2.7, and the sucrose monoesters were identified by HPLC–MS, NMR and IR.
Journal: Ultrasonics Sonochemistry - Volume 17, Issue 2, February 2010, Pages 352–355