期刊
POLYMERS
卷 4, 期 2, 页码 1037-1055出版社
MDPI
DOI: 10.3390/polym4021037
关键词
biobased polyesters; castor oil; lipases; oligo-ricinoleic acid; polyglycerol polyricinoleate; ricinoleic acid; 10-undecenoic acid
资金
- (US) National Institutes of Health [5R03EB005664-02]
- Fundacion Seneca of Murcia
- Ministerio de Ciencia e Innovacion of Spain
- Hayes laboratory through the International Exchange Program for Agri-food Quality and Safety (948 Program from Ministry of Agriculture) [2011-S10]
Lipases were employed under solvent-free conditions to conjugate oligo-ricinoleic acid derivatives with 10-undecenoic acid, to incorporate a reactive terminal double bond into the resultant product. First, undecenoic acid was covalently attached to oligo-ricinoleic acid using immobilized Candida antarctica lipase (CAL) at a 30% yield. Thirty percent conversion also occurred for CAL-catalyzed esterification between undecenoic acid and biocatalytically-prepared polyglycerol polyricinoleate (PGPR), with attachment of undecenoic acid occurring primarily at free hydroxyls of the polyglycerol moiety. The synthesis of oligo-ricinoleyl-, undecenoyl- structured triacylglycerols comprised two steps. The first step, the 1,3-selective lipase-catalyzed interesterification of castor oil with undecenoic acid, occurred successfully. The second step, the CAL-catalyzed reaction between ricinoleyl-, undecenoyl structured TAG and ricinoleic acid, yielded approximately 10% of the desired structured triacylglycerols (TAG); however, a significant portion of the ricinoleic acid underwent self-polymerization as a side-reaction. The employment of gel permeation chromatography, normal phase HPLC, NMR, and acid value measurements was effective for characterizing the reaction pathways and products that formed.
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