Stable cellulase immobilized on graphene oxide@CMC-g-poly(AMPS-co-AAm) hydrogel for enhanced enzymatic hydrolysis of lignocellulosic biomass

被引:57
作者
Ariaeenejad, Shohreh [1 ]
Motamedi, Elaheh [2 ]
Salekdeh, Ghasem Hosseini [1 ,3 ]
机构
[1] AREEO, ABRII, Dept Syst & Synthet Biol, Karaj, Iran
[2] AREEO, ABRII, Dept Nanotechnol, Karaj, Iran
[3] Macquarie Univ, Dept Mol Sci, Sydney, NSW, Australia
关键词
Bioconversion; Dual cross-linked hydrogel; Graphene oxide; Enzyme immobilization; Cellulase; Sugar beet pulp; SUGAR-BEET PULP; NANOCOMPOSITE HYDROGELS; ENZYMES; PROTEIN; COMPOSITE; WATER; ASSAY; ACID;
D O I
10.1016/j.carbpol.2019.115661
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
This study indicated tailoring efficient polymer-enzyme bioconjugates with superb stability and activity for practical utilization of cellulase enzyme in hydrolyzing lignocellulosic biomass. To this goal, a dual crosslinking (DC) strategy was presented to synthesize novel 3D networks of carboxymethyl cellulose grafted copolymers of 2-acrylamido-2methyl propane sulfonate and acrylamide (CMC-g-poly(AMPS-co-AAm)) hydrogels. Graphene oxide (GO) nano-sheets were utilized as nano-filler and physical cross-linker making H-bondings between polymeric chains to prepare GO@CMC-g-poly(AMPS-co-AAm) networks. The GO content effects on the performance of as-synthesized architectures in conjugation to a model enzyme (PersiCel1) were examined. PersiCel1 immobilization on the GO reinforced hydrogels resulted in noticeable retaining near 60 % of its maximum activity at 90 degrees C, along with the remarkable enhancement of its specific activity and storage stability. Compared with the free PersiCell, the immobilized enzyme on the GO containing hydrogels showed 154.8% increase in conversion of alkalin-treated sugar beet pulp, while the PersiCel1/neat-Hydrogel indicated an increment of 66.7 %, under the same conditions.
引用
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页数:12
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