Ultrasound-assisted lipase-catalyzed transesterification of soybean oil in organic solvent system.

Autor: Batistella L; Department of Food Engineering, URI - Campus de Erechim, Av Sete de Setembro, 1621 Erechim 99700-000, RS, Brazil., Lerin LA, Brugnerotto P, Danielli AJ, Trentin CM, Popiolski A, Treichel H, Oliveira JV, de Oliveira D
Jazyk: angličtina
Zdroj: Ultrasonics sonochemistry [Ultrason Sonochem] 2012 May; Vol. 19 (3), pp. 452-8. Date of Electronic Publication: 2011 Dec 03.
DOI: 10.1016/j.ultsonch.2011.11.018
Abstrakt: This work reports the transesterification of soybean oil with ethanol using two commercial immobilized lipases under the influence of ultrasound irradiation. The experiments were performed in an ultrasonic water bath, following a sequence of experimental designs to assess the effects of temperature, enzyme and water concentrations, oil to ethanol molar ratio and output irradiation power on the reaction yield. Results show that ultrasound-assisted lipase-catalyzed transesterification of soybean oil with ethanol might be a potential alternative route to conventional alkali-catalyzed method, as high reaction yields (~90 wt.%) were obtained at mild irradiation power supply (~100 W), and temperature (60 °C) in a relatively short reaction time, 4h, using Lipozyme RM IM as catalyst. The repeated use of the catalyst under the optimum experimental condition resulted in a decay in both enzyme activity and product conversion after two cycles. The use of Novozym 435 led to lower conversions (about 57%) but the enzyme activity was stable after eight cycles of use, showing, however, a reduction in product conversion after the forth cycle.
(Copyright © 2011 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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