Structure and properties of lipase activated by cellulose-silica polyethersulfone membrane for production of pentyl valerate

Electrospun Magnetic Nanocellulose–Polyethersulfone-Conjugated Aspergillus oryzae Lipase for Synthesis of Ethyl Valerate

“…Peaks 1583 and 1605 cm −1 of PES (Figure 2b) presented benzene units' conjugated C=C stretching vibration, while peaks 1068, 1070, and 1143 cm −1 were symmetric and asymmetric stretching modes of C-O-C. The peak for the asymmetric C-S-C stretching that appeared at 789 cm −1 confirmed the structure of PES in MNC/PES (Figure 2b) [34].…”

“…The latter originated from traces of phosphate buffer [43,44], used during AOL immobilization on the MNC/PES. The formation of new intermolecular hydrogen bonds between O-H molecules on AOL and functional groups on MNC/PES fibers shifted the O-H stretching vibration from 3450 cm −1 to 3318 cm −1 and increased band intensity [34,44]. The electrospun MNC/PES fiber spectrum showed typical MNC peaks (Figure 1b), with the benzene ring's stretching vibrations seen as two peaks at 1576 cm -1 and 1486 cm −1 .…”

“…Deformational modes of the C-C-C ring, symmetric and asymmetric stretching modes of C-O-C of the glycosidic bond emerged at 373, 1111, and 1095 cm −1 . The C-N stretching combined with the symmetric CH 3 bending for the amide produced a peak at 1378 cm −1 [34,49]. Peaks 1583 and 1605 cm −1 of PES (Figure 2b) presented benzene units' conjugated C=C stretching vibration, while peaks 1068, 1070, and 1143 cm −1 were symmetric and asymmetric stretching modes of C-O-C.…”

“…NC is a cellulose fiber derived from a variety of agricultural and municipal biomass sources. In this work, pure cellulose fibers were treated with concentrated H 2 SO 4 , which cleaves the glycosidic linkages in the amorphous domains of the biomass into smaller NC units, physically visible as a white powder [34,35]. The magnetic nanoparticles (MNPs) were subsequently synthesized using a chemical co-precipitation technique.…”

Solvent-free esterifications mediated by immobilized lipases: a review from thermodynamic and kinetic perspectives

“…Aguieiras and co-workers (2019) obtained conversions of 80% in the syntheses of wax esters using agroindustrial wastes as a source of fatty acids and raw material for biocatalysts obtaining (66); babassu residues were also successfully used by Moreira et al (2020) (67) as a source of fatty acids in SFS enzymatic esterification mediated by R. miehei immobilized on magnetic particles for biodiesel production. Flavor esters have also been successfully synthesized (conversions close to 90% or higher) in SFS esterification using different immobilized lipases -pentyl valerate (68), methyl and ethyl butyrate (69), propyl benzoate (70), and n-butyl acetate (71). Mid and long-chain esters, useful as emollients, surfactants, or plasticizers, were also obtained in SFS with high conversions, as showed by Silva et al (2020Silva et al ( , 2021 (72,73) in the synthesis of 2-ethylhexyl oleate and isopropyl palmitate, Musa et al (2019) in the syntheses of different butyl esters (74), and Lee et al (2019) in the synthesis of diisononyl adipate (75).…”