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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Ultrasound affects the selectivity and activity of immobilized lipases applied to fatty acid ethyl ester synthesis

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Quilles Junior, Jose Carlos [1] ; Ferrarezi, Ana Lucia [2] ; Borges, Janaina Pires [3] ; Rossi, Jessika Souza [1] ; Bocchini, Daniela Alonso [3] ; Gomes, Eleni [2] ; da Silva, Roberto [1] ; Boscolo, Mauricio [1]
Total Authors: 8
[1] Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, Dept Quim & Ciencias Ambientais, Rua Cristovao Colombo 2265, BR-15054000 Sao Paulo, SP - Brazil
[2] Univ Estadual Paulista, Dept Biol, Sao Jose Do Rio Preto, SP - Brazil
[3] Univ Estadual Paulista, Inst Ouim, Dept Bioquim & Tecnol Quim, Araraquara, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 0

Hydrophobic carriers can be used to improve the activity, stability and other properties of enzymes. Physical agents, like ultrasound, may also contribute to improving the dispersion and collision of the reagent molecules, decreasing the reaction time and intensifying the catalytic process. However, its effect on the enzyme activity and reaction selectivity is still not entirely understood. Here, enzyme modulation of immobilized lipases was studied under pulsed ultrasound irradiation in fatty acid ethyl ester (FAEE) synthesis for biodiesel production. Novozym 435 (R) and two commercial lipases from Thermomyces lanuginosus and Rhizomucor miehei, immobilized on Octadecyl-Sepabeads were used as a biocatalyst in the transesterification reaction of vegetable oils and ethanol. The use of ultrasound associated with catalysis by the Novozym 435 increased the production of FAEE by about three times (from 8.9 to 26.4%) using soybean oil and changes were observed in the profile of the products. From the sonicated reaction, ethyl-palmitate production decreased from 23.4 to 11.7%, while the ethyl-linoleate content rose from 47.5 to 59.2%. On the other hand, the T. lanuginosus lipase was less affected by sonication with the overall production of FAEE increasing from 17.2 to 24.1%, with ethyl-palmitate and ethyl-linoleate content changing from 16.2 to 17.5% and 55.0 to 47.8%, respectively. Although the changes in the production yield are not too high, the main idea here was to show that ultrasound modulates the lipase activity as well as its respective selectivity. Thus, ultrasound, is responsible for changing the ethyl ester production, which can be applied to many other biochemical processes to improve or modulate their synthesis yield. (AU)

FAPESP's process: 12/09054-3 - Immobilization of lipases on agarose and chitosan and application in biocatalysis.
Grantee:José Carlos Quilles Junior
Support type: Scholarships in Brazil - Master
FAPESP's process: 14/20504-6 - Influence of rare earth elements in the catalytic properties of hydrotalcites and their oxides for ethyl biodiesel production
Grantee:Jessika de Souza Rossi
Support type: Scholarships in Brazil - Master