Kinetic and Thermodynamic Study of 2-Ethylhexyl Oleate Synthesis Catalyzed by Candida antarctica Lipase Immobilized on a Magnetic Hybrid Support

Autor(es)

da Silva, Mateus V. C. ^[1] ; Rangel, Amanda B. S. ^[1] ; Dutra, Fellipe P. ^[1] ; de Castro, Heizir F. ^[1] ; de Freitas, Larissa ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Engn Sch Lorena, Dept Chem Engn, BR-12602810 Lorena, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CATALYSIS LETTERS; v. 151, n. 5, p. 1239-1247, MAY 2021.
• Citações Web of Science: 1

Resumo

This study investigated the kinetic and thermodynamic parameters of the synthesis of 2-ethylhexyl oleate catalyzed byCandida antarcticalipase (CALB) immobilized on magnetic poly(styrene-co-divinylbenzene) (STY-DVB-M). The influence of acid/alcohol molar ratio and temperature on oleic acid conversion, ester concentration, and productivity was also assessed. Excess of one of the reagents resulted in high conversions, but the highest productivities were obtained at the stoichiometric ratio. Thus, a 1:1 molar ratio was considered optimal. Thermodynamic parameters calculated from the van't Hoff equation (Delta S = + 850.64 J mol(-1) K-1, Delta H = + 273.78 kJ mol(-1)) revealed that the reaction is endothermic with a positive entropy change. Temperatures below 45 degrees C negatively affected reaction kinetics, explained by the positive Delta Gvalues. CALB-STY-DVB-M showed a hydrolytic activity of 522.97 +/- 19.14 U g(-1)and was about 1.7 times more thermally stable at 60 degrees C than the free enzyme. In an operational stability test, conducted for 7 consecutive cycles of 24 h, the biocatalyst had a half-life of 739 h. CALB-STY-DVB-M showed satisfactory performance in the synthesis of 2-ethylhexyl oleate, providing oleic acid conversions close to 100%, ester concentration of 450 g L-1, and productivity of 0.5 mmol g(-1) h(-1). The biocatalyst holds promise for industrial applications. {[}GRAPHICS] . (AU)

• Processo FAPESP: 16/10636-8 - Da fábrica celular à biorrefinaria integrada Biodiesel-Bioetanol: uma abordagem sistêmica aplicada a problemas complexos em micro e macroescalas
• Beneficiário: Roberto de Campos Giordano
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 16/17833-3 - Síntese de ésteres emolientes catalisada por lipase imobilizada em copolímeros à base de estireno com propriedades magnéticas
• Beneficiário: Larissa de Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Regular