Journal
BIOTECHNOLOGY LETTERS
Volume 32, Issue 10, Pages 1463-1471Publisher
SPRINGER
DOI: 10.1007/s10529-010-0311-z
Keywords
Esterification; 1,12-Dodecanedioic acid; Immobilized lipase B from Candida antarctica; Poly(diethyl 1,12-dodecanedioate-co-1-thioglycerol); Poly(1,12-dodecanedioic acid-co-1-thioglycerol); 1-Thioglycerol (3-mercaptopropane-1,2-diol)
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Copolymeric polyoxoesters containing branched-chain methylenethiol functions, i.e., poly(1,12-dodecanedioic acid-co-1-thioglycerol) and poly(diethyl 1,12-dodecanedioate-co-1-thioglycerol), were formed by lipase-catalyzed polyesterification and polytransesterification of 1,12-dodecanedioic acid and diethyl 1,12-dodecanedioate, respectively, with 1-thioglycerol (3-mercaptopropane-1,2-diol) using immobilized lipase B from Candida antarctica (Novozym 435) in vacuo without drying agent in the reaction mixture. After 360-480 h, both polyoxoesters were purified by extraction from the reaction mixtures followed by solvent fractionation. The precipitate of poly(1,12-dodecanedioic acid-co-1-thioglycerol) demonstrated a M-W of similar to 170,000 Da, whereas a M-W of similar to 7,100 Da only was found for poly(diethyl 1,12-dodecanedioate-co-1-thioglycerol). Both polycondensates were analyzed by GPC/SEC, alkali-catalyzed transmethylation, NMR- and FTIR-spectrometry.
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