Feruloyl esterase immobilization in mesoporous silica particles and characterization in hydrolysis and transesterification
Journal article, 2018
decreased efficiency in industrial applications. A strategy to address this limitation is to immobilize the enzyme.
Mesoporous silica materials offer unique properties as an immobilization support, such as high surface area and
tunable pore size.
Results: The performance of a commercially available feruloyl esterase, E-FAERU, immobilized on mesoporous silica
by physical adsorption was evaluated for its transesterification ability. We optimized the immobilization conditions
by varying the support pore size, the immobilization buffer and its pH. Maximum loading and maximum activity
were achieved at different pHs (4.0 and 6.0 respectively). Selectivity, shown by the transesterification/hydrolysis
products molar ratio, varied more than 3-fold depending on the reaction buffer used and its pH. Under all
conditions studied, hydrolysis was the dominant activity of the enzyme. pH and water content had the greatest
influence on the enzyme selectivity and activity. Determined kinetic parameters of the enzyme were obtained
and showed that Km was not affected by the immobilization but kcat was reduced 10-fold when comparing the free
and immobilized enzymes. Thermal and pH stabilities as well as the reusability were investigated. The immobilized
biocatalyst retained more than 20% of its activity after ten cycles of transesterification reaction.
Conclusions: These results indicate that this enzyme is more suited for hydrolysis reactions than transesterification
despite good reusability. Furthermore, it was found that the immobilization conditions are crucial for optimal
enzyme activity as they can alter the enzyme performance.
Mesoporous silica
E-FAERU
Kinetic parameters
Enzyme stability
Enzyme reusability
Feruloyl esterase selectivity
Author
Cyrielle Bonzom
Chalmers, Biology and Biological Engineering, Industrial Biotechnology
Laura Schild
Student at Chalmers
Hanna Gustafsson
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Lisbeth Olsson
Chalmers, Biology and Biological Engineering, Industrial Biotechnology
BMC Biochemistry
14712091 (eISSN)
Vol. 19 1 1Subject Categories
Biochemistry and Molecular Biology
Biocatalysis and Enzyme Technology
Infrastructure
Chalmers Infrastructure for Mass spectrometry
Areas of Advance
Life Science Engineering (2010-2018)
DOI
10.1186/s12858-018-0091-y