| Linear copolymeric poly(thia-alkanedioates) by lipase-catalyzed esterification and transesterification of 3,3'-thiodipropionic acid and its dimethyl ester with alpha,omega-alkanediols. | |
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MedLine Citation:
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PMID: 17969136 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Linear copolymeric polyesters (polyoxoesters) containing thioether functions [poly(3,3'-thiodipropionic acid-co-alpha,omega-alkanediols)] were formed in good yield by esterification of an equimolar mixture of 3,3'-thiodipropionic acid (4-thiaheptane-1,7-dioic acid) and 1,6-hexanediol (weight average molecular mass, M(W) >600 Da: approximately 81% after 6 h) or 1,12-dodecanediol (M(W) > 900 Da: approximately 90% after 6 h) catalyzed by immobilized lipase B from Candida antarctica (Novozym 435) for up to 336 h in moderate vacuo without a solvent or drying reagent in the reaction mixture. Poly (3,3'-thiodipropionic acid-co-1,6-hexanediol) and poly (3,3'-thiodipropionic acid-co-1,12-dodecanediol) were extracted from the reaction mixtures using tetrahydrofurane and precipitated from tetrahydrofurane-iso-hexane (1:1, v/v) at approximately 0 degrees C. The precipitate of poly(3,3'-thiodipropionic acid-co-1,6-hexanediol) showed a maximum molecular weight of 6 x 10(5) Da corresponding to a M(W) of approximately 24,200 Da and a degree of polymerization of up to 2,150 monomer units. The precipitated poly(3,3'-thiodipropionic acid-co-1,12-dodecanediol) showed a maximum molecular weight of 8 x 10(5) Da corresponding to a M(W) of approximately 27,200 Da and a maximum degree of polymerization of up to 2,200 monomer units. The chemical structures of both polyesters containing thioether functions were confirmed by chemical derivatization and NMR spectrometry. The chemical structures of various low-molecular weight reaction intermediates of the esterification of 3,3'-thiodipropionic acid with 1,6-hexanediol were elucidated by GC-MS. |
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Authors:
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E Fehling; E Klein; K Vosmann; K Bergander; N Weber |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Biotechnology and bioengineering Volume: 99 ISSN: 1097-0290 ISO Abbreviation: Biotechnol. Bioeng. Publication Date: 2008 Apr |
Date Detail:
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Created Date: 2008-02-28 Completed Date: 2008-03-31 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7502021 Medline TA: Biotechnol Bioeng Country: United States |
Other Details:
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Languages: eng Pagination: 1074-84 Citation Subset: IM |
Affiliation:
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Institute for Lipid Research, Federal Research Centre for Nutrition and Food, Piusallee 68/76, 48147 Münster, Germany. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Alcohols
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chemistry* Antioxidants / chemical synthesis Catalysis Chromatography / methods Esterification Lipase / chemistry* Magnetic Resonance Spectroscopy Polyesters / chemical synthesis* Propionic Acids / chemistry* Sulfides / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Alcohols; 0/Antioxidants; 0/Polyesters; 0/Propionic Acids; 0/Sulfides; 111-17-1/thiodipropionic acid; EC 3.1.1.-/Lipozyme; EC 3.1.1.-/lipase B, Candida antarctica; EC 3.1.1.3/Lipase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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