Laccase Activation in Deep Eutectic Solvents

Autor(es)

Toledo, Mariah L. ^{[1, 2]} ; Pereira, Matheus M. ^[1] ; Freire, Mara G. ^[1] ; Silva, Joao P. A. ^[2] ; Coutinho, Joao A. P. ^[1] ; Tavares, Ana P. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Aveiro, Dept Chem, CICECO Aveiro Inst Mat, Campus Univ Santiago, P-3810193 Aveiro - Portugal

^[2] Univ Sao Paulo, Dept Chem Engn, Engn Sch Lorena, Estr Municipal Campinho S-N, BR-12602810 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 7, n. 13, p. 11806-11814, JUL 1 2019.
• Citações Web of Science: 1

Resumo

The research on alternative solvents and cosolvents is relevant when envisioning the improvement of biocatalytic reactions. Among these solvents and cosolvents, deep eutectic solvents (DES) may be considered as customizable new reaction media for biocatalysis. Accordingly, in this work, 16 DES aqueous solutions, as well as the individual DES components at the same conditions, have been investigated in laccase-catalyzed reactions. Cholinium- and betaine-based DES formed with polyols at different molar ratios and concentrations were evaluated. The results reported show that in the presence of most DES the laccase activity is preserved and, with a particular DES, enhanced up to 200%. Molecular docking studies demonstrated that while most DES components establish hydrogen bonds with the enzyme amino acids, those that establish stronger interactions with the enzyme (expressed by absolute values of docking affinity energies) lead to an enhanced laccase activity. Finally, the laccase stability was evaluated in additional tests under extreme storage temperatures (60 degrees C and -80 degrees C). Although no significant protection to high temperatures was afforded by DES, an enhanced laccase activity when stored at low temperatures was found, at least up to 20 days. Combining experimental results and molecular docking, this work shows that DES can be designed as cosolvents to improve biocatalytic reactions. (AU)

• Processo FAPESP: 16/06683-0 - Obtenção de óleos microbianos por leveduras a partir de glicerol empregando biorreatores do tipo Coluna de Bolhas e Air-Lift
• Beneficiário: João Paulo Alves Silva
• Linha de fomento: Auxílio à Pesquisa - Regular