期刊
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
卷 71, 期 1-2, 页码 1-9出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcatb.2011.02.015
关键词
Linear ester oligomers; Cyclic ester oligomers; CAL B; Biobased monomers; Di-anhydro hexitols
资金
- Dutch Ministry of Economic Affairs
- B-Basic partner organization
- European Commission [Bioproduction/NMP-2-CT-2007-026515]
- Agrotechnology and Food Sciences Group
The synthesis of linear ester oligomers (LEOs) and cyclic ester oligomers (CEOs) from non-activated succinic acid (A) in combination with di-anhydro hexitols (B, DAH) in a toluene based medium using immobilized Candida antarctica lipase B (CAL B), was studied. The conversion is highest for isomannide and decreases in the order isomannide > isosorbide >> isoidide. These experimental results were corroborated by substrate-imprinted docking indicating that the hydroxyl group oriented inwards the V-shaped plane of the DAHs (endo-hydroxyl) is preferred over the outwards oriented hydroxyl group (exo-hydroxyl) by CAL B. The maximum conversions under optimized conditions were 88.2% and 93.7% for succinic acid and isomannide, respectively. MALDI-TOF detected products at 24 h were a mixture of cyclic (35.1%) and linear ester oligomers (64.9%). Cyclic ester oliogomers were the most abundant products during the first 8 h of reaction (32.5-48.7%), where the first cyclic of the series (CEO1) was the most predominant cyclic product (23-40%). (C) 2011 Elsevier B.V. All rights reserved.
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