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Synthesis of octyl dihydrocaffeate and Its transesterification with tricaprylin catalyzed by candida antarctica lipase / Vivian Feddern in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7183-7190 Titre : Synthesis of octyl dihydrocaffeate and Its transesterification with tricaprylin catalyzed by candida antarctica lipase Type de document : texte imprimé Auteurs : Vivian Feddern, Auteur ; Zhiyongh Yang, Auteur ; Xuebing Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 7183-7190 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  reaction  Transesterification Résumé : This work aimed at producing a phenolic ester from dihydrocaffeic acid (DHCA), besides carrying out transesterification reactions of this ester with tricaprylin. The esterification reaction was performed in two ratios (1:1 and 1:3 DHCA:octanol), and the transesterification was done in four ratios (1:1, 1:2, 1:5, and 1:10) between the produced ester and tricaprylin. In the last, a Central Composite Rotatable Design was employed, varying the amount of enzyme (1.6―18.4%), reaction time (9.9―35.1 h), and temperature (43.2―76.8 °C) on reagent consumption percentage. Novozym 435 was the catalyst in all reactions. The highest ester yield (50%) occurred in 8 days. In transesterification reactions, higher consumption of the produced ester was achieved at ratios 1:5 and 1:10, obtaining, respectively, 29.6% and 21.1% of octyl dihydrocaffeate residual, in 24 h. At higher temperatures and time above 26 h, there was less octyl dihydrocaffeate residual (18.7%). Three different phenolic compounds were identified. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239032 [article] Synthesis of octyl dihydrocaffeate and Its transesterification with tricaprylin catalyzed by candida antarctica lipase [texte imprimé] / Vivian Feddern, Auteur ; Zhiyongh Yang, Auteur ; Xuebing Xu, Auteur . - 2011 . - pp. 7183-7190. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7183-7190 Mots-clés : Catalytic  reaction  Transesterification Résumé : This work aimed at producing a phenolic ester from dihydrocaffeic acid (DHCA), besides carrying out transesterification reactions of this ester with tricaprylin. The esterification reaction was performed in two ratios (1:1 and 1:3 DHCA:octanol), and the transesterification was done in four ratios (1:1, 1:2, 1:5, and 1:10) between the produced ester and tricaprylin. In the last, a Central Composite Rotatable Design was employed, varying the amount of enzyme (1.6―18.4%), reaction time (9.9―35.1 h), and temperature (43.2―76.8 °C) on reagent consumption percentage. Novozym 435 was the catalyst in all reactions. The highest ester yield (50%) occurred in 8 days. In transesterification reactions, higher consumption of the produced ester was achieved at ratios 1:5 and 1:10, obtaining, respectively, 29.6% and 21.1% of octyl dihydrocaffeate residual, in 24 h. At higher temperatures and time above 26 h, there was less octyl dihydrocaffeate residual (18.7%). Three different phenolic compounds were identified. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239032