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

Author(s)

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

Affiliation

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

• Document type: Journal article
• Source: CATALYSIS LETTERS; v. 151, n. 5, p. 1239-1247, MAY 2021.
• Web of Science Citations: 1

Abstract

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)

• FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
• Grantee: Roberto de Campos Giordano
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants
• FAPESP's process: 16/17833-3 - Emollient esters synthesis catalyzed by immobilized lipase on styrene-based polymers with magnetic properties
• Grantee: Larissa de Freitas
• Support Opportunities: Regular Research Grants