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dc.contributor.authorFreitas, Vitória Olave dept_BR
dc.contributor.authorMatte, Carla Robertapt_BR
dc.contributor.authorPoppe, Jakeline Kathielept_BR
dc.contributor.authorRodrigues, Rafael Costapt_BR
dc.contributor.authorAyub, Marco Antônio Záchiapt_BR
dc.date.accessioned2023-05-10T03:27:40Zpt_BR
dc.date.issued2019pt_BR
dc.identifier.issn0104-6632pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/257890pt_BR
dc.description.abstractWe applied ultrasonic technology for the transesterification of soybean oil catalyzed by a mixture of lipases (combi-lipase: 75 % Novozym 435; 10 % Lipozyme TL-IM; and 15 % Lipozyme RM-IM), verifying the effects of ultrasonic amplitude, pulse conditions, the ethanol:oil molar ratio, enzyme concentration, and the influence of solvent (tert-butanol on the reaction. We also compared this system against ultrasound combined with mechanical stirring, and the efficiency of the combi-lipase, compared with the individual use of each lipase. The optimum conditions for the transesterification reaction were determined as enzyme concentration of 15 % (in relation to oil mass); ethanol:oil molar ratio of 3:1; ultrasonic amplitude of 30 %, duty cycle of 50 % and time pulse of 15 sec. The yields of conversion of ethyl esters with and without solvent were similar, indicating that the use of solvents during enzymatic transesterification reactions is not necessary when ultrasonic technology is applied to the system. The combination of mechanical stirring and ultrasound did not improve the yields of conversion compared to ultrasonic technology alone. The proposed combi-lipase produced higher yields of ethyl esters (75 %) than the individual lipases (55 %) in 5 h under ultrasonic-assisted batch reactions.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofBrazilian journal of chemical engineering [recurso eletrônico]. São Paulo. Vol. 36, no. 2 (Apr./June 2019), p. 995-1005pt_BR
dc.rightsOpen Accessen
dc.subjectTransesterificationen
dc.subjectTransesterificaçãopt_BR
dc.subjectCombi-lipaseen
dc.subjectLipasept_BR
dc.subjectUltrassompt_BR
dc.subjectUltrasound-assisted technologyen
dc.subjectBiodieselpt_BR
dc.subjectBiodieselen
dc.titleUltrasound-assisted transesterification of soybean oil using combi-lipase biocatalystspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001167843pt_BR
dc.type.originNacionalpt_BR


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