文献类型：期刊文献

英文题名：Kinetic Modeling of Esterification Reaction of Surfactin-C15 in Methanol Solution

作者：Zhao, Yue[1,2];Yang, Shi-Zhong[1,2];Mu, Bo-Zhong[1,2]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Appl Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：169

期号：1

起止页码：327

外文期刊名：APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY

收录：;EI(收录号：20130615984772);WOS:【SCI-EXPANDED(收录号:WOS:000314023100029)】；

基金：This work was supported by the National Natural Science Foundation of China (nos. 41073055, 51174092, 41161160560).

语种：英文

外文关键词：Surfactin; Esterification; Mono-methyl ester; Kinetic; Lipopeptide

摘要：Surfactin in methanol solution with acid would be spontaneously esterified into the mono- or dimethyl ester surfactin even at a temperature as low as 4 A degrees C because there were two free carboxyl groups in the peptide loop of surfactin. Using trifluoroacetic acid as the catalyst, the esterification and the contents change in surfactin-C-15, mono- and dimethyl ester surfactin-C-15 with time were investigated at 4, 25, and 45 A degrees C, respectively. The kinetic model was established for prediction of the esterification degree under experimental conditions. At 4, 25, and 45 A degrees C, more than 10 % of the surfactin-C-15 in methanol solution in the presence of 0.05 % trifluoroacetic acid was changed into the esterified surfactin-C-15 after 37.6, 14.1, and 7.4 h, respectively. The maximum of intermediate of the mono-methyl ester surfactin-C-15 was observed at 4, 25, and 45 A degrees C after 25, 10, and 5 days, respectively. Our results indicated that the time for preparation should be strictly controlled to avoid an unexpected esterification of surfactin during its storage and experimental treatment, and the kinetic results could be adopted as the reference condition for preparation of monomethyl ester surfactin-C-15.