TY - JOUR AB - This work reports the production of fatty acid ethyl esters (FAEE) by means of Macauba (Acrocomia aculeata) coconut oil (MCO) solvent-free enzymatic transesterification reactions using a commercial immobilized lipase (Novozym 435) under the influence of ultrasound irradiation. An experimental design was used to evaluate the effects of temperature (40-70 degrees C), enzyme (5-20 wt%) concentration, oil to ethanol molar ratio (1:3-1:10) and output irradiation power (40-70% of the maximum supply value) on the reaction yield. Besides, a kinetic study varying the enzyme concentration was also carried out. Results show that ultrasound-assisted lipase-catalyzed transesterification of MCO with ethanol in solvent-free system might be a potential alternative route to conventional alkali-catalyzed and/or traditional enzymatic methods, as reaction yields around 70 wt% were obtained at mild irradiation power supply (similar to 132 W), and temperature (65 degrees C) in a short reaction time, 30 min. Reutilization of enzyme showed that it may be advantageously employed up to 5 reuse cycles. (C) 2014 Elsevier Ltd. All rights reserved. AD - Univ Reg Integrada Alto Uruguai & Missoes, Dept Food Engn, BR-99700000 Erechim, RS, Brazil AN - WOS:000348955400042 AU - Michelin, S. AU - Penha, F. M. AU - Sychoski, M. M. AU - Scherer, R. P. AU - Treichel, H. AU - Valerio, A. AU - Di Luccio, M. AU - de Oliveira, D. AU - Oliveira, J. V. DA - Apr DO - 10.1016/j.renene.2014.11.067 J2 - Renew Energ KW - ultrasound LA - English N1 - Ca5np PY - 2015 SN - 0960-1481 SP - 388-393 ST - Kinetics of ultrasound-assisted enzymatic biodiesel production from Macauba coconut oil T2 - Renewable Energy TI - Kinetics of ultrasound-assisted enzymatic biodiesel production from Macauba coconut oil UR - ://WOS:000348955400042 VL - 76 ID - 11576 ER -