Enhancing cellulose nanofibrillation of eucalyptus Kraft pulp by combining enzymatic and mechanical pretreatments

Cebreiros, Florencia; Seiler, Santiago; Dalli, Sai Swaroop; Lareo, Claudia; Saddler, Jack N.

doi:10.1007/s10570-020-03531-w

Cited by 19 publications

(7 citation statements)

References 49 publications

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“…The synergism between lipase and xylanase further improved the cellulose accessibility of the pretreated enzyme. The results showed that the combination of these strategies was suitable for improving the strength of the pulp while maintaining the properties of cellulose, without causing further cellulose degradation [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

et al. 2022

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Based on the reduction of environmental pollution, a biological enzyme assisted alkali-oxygen pulping method was explored to improve the delignification efficiency and fiber accessibility of wheat straw and improve the properties of wheat straw pulp. In this paper, lipase and xylanase were used to pretreat wheat straw and the effects of different enzyme types and enzyme dosage on the microstructure and pulp properties of wheat straw were investigated and experimented. The results showed that the lipase can remove fat and wax on the surface of wheat straw, while xylanase degraded the hemicellulose components, such as xylan, of wheat straw fiber, destroyed the structure of the lignin-carbohydrate complex, increasing lignin removal as a result and enhancing the impregnating, diffusion and penetration of alkali. Compared with wheat straw without enzyme pretreatment, the skeleton of wheat straw pretreated by enzyme became looser, the internal cavity appeared and the wall cavity became thin and transparent. The fines decreased obviously and the length of fibers increased. After combined pretreatment with lipase (15 U·g−1) and xylanase (15 U·g−1), the pulping performance of wheat straw was improved and the tensile index (97.37 N·m·g−1), brightness (40.9% ISO) and yield (58.10%) of the pulp increased by 12.9%, 19.9% and 9.9%, respectively. It can be seen that enzyme pretreatment is a green and effective approach to improving the alkali-oxygen pulping performance of wheat straw.

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Section: Resultsmentioning

confidence: 99%

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

et al. 2022

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“…The third stage took place at Tonset=280 °C and remained until 453 °C with a Tmax=338.46°C corresponding to cellulose degradation. It is well outlined that, contrary to hemicelluloses and cellulose and due to its aromatic ring structure, lignin is more heatresistant and initiates to degrade at lower temperatures (≤200°C) until 700-900°C (Maheswari et al 2012;Gabriel et al 2020;Cebreiros et al 2021). At temperatures ≥ 400°C, gaseous molecules with lower molecular weight are produced after oxidation and cleavage of the char part (Morán et al 2008).…”

Section: Thermogravimetry Investigationmentioning

confidence: 99%

“…These phases are related to the major constituents (hemicelluloses, cellulose and lignin) of the lignocellulosic biomass (Maheswari et al 2012). In the first phase [25-135°C], the two studied samples lost 8-10 % of their weight because of the evaporation of water molecules and other volatiles (Gabriel et al 2020;Cebreiros et al 2021). For the untreated sample, the second region started at Tonset=130°C and ended at Tend=270°C with a maximum decomposition temperature (Tmax) at 265°C corresponding to the degradation of hemicelluloses which are more sensitive to temperature than cellulose and lignin mostly owing to the existence of acetyl groups (Cebreiros et al 2021).…”

Section: Thermogravimetry Investigationmentioning

confidence: 99%

“…In the first phase [25-135°C], the two studied samples lost 8-10 % of their weight because of the evaporation of water molecules and other volatiles (Gabriel et al 2020;Cebreiros et al 2021). For the untreated sample, the second region started at Tonset=130°C and ended at Tend=270°C with a maximum decomposition temperature (Tmax) at 265°C corresponding to the degradation of hemicelluloses which are more sensitive to temperature than cellulose and lignin mostly owing to the existence of acetyl groups (Cebreiros et al 2021). The third stage took place at Tonset=280 °C and remained until 453 °C with a Tmax=338.46°C corresponding to cellulose degradation.…”

Section: Thermogravimetry Investigationmentioning

confidence: 99%

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Valorization of pea by-products for the isolation of cellulosic microfibers: extraction and physico-chemical characterization

BHIRI

Abidi

Bouallegue³

et al. 2022

Preprint

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Tremendous by-products are generated from food processes, which cause environmental and economic issues. The valorization of these low-priced wastes will, not only reduce these drawbacks, but also provide attractive raw materials for alternative sustainable technologies. The aim of this study was to explore the utilization of agro-industrial wastes, the pea pods, as renewable bio-sources for the isolation of cellulosic microfibers (CMFs). The CMFs were extracted applying a multi-step process (dewaxing, hot water, alkaline and chlorine-free bleaching treatments). The analysis of the raw material indicated that it contains 27.3 ± 0.700% wt α−cellulose, 17.3 ± 1.201% wt hemicelluloses and 14.94 ± 0.028% wt lignin, amongst other components. The yield, α-cellulose content and average thickness of the extracted CMFs were 26.1 ± 1.430%, 84.38 ± 0.37 % and 11 ± 0.905 µm, respectively. The discard of the majority of lignin and hemicelluloses from the surface of the fibers was checked by color study, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), nuclear magnetic resonance (NMR) and thermogravimetry (ATG). The peaks exhibited by the isolated CMFs in X-ray diffraction patterns refer to the presence of type I cellulose with a crystallinity of 63.61%. Additionally, thermogravimetric analysis demonstrated the thermal stability of CMFs compared to the raw material. Data are promising for getting benefits from these vegetable wastes for cellulose isolation and its potential application in bio-based materials leading to an efficacious waste control.

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“…This increase in the CNF yield is consistent with previous studies that reported improving the enzymatic hydrolysis efficiency in bleached sulfonated thermomechanical pulps. (228,229) Besides, enzymatic low-loading conditions were sufficient to improve the CNF conversion significatively.…”

Section: Declarationsmentioning

confidence: 99%

Lignocellulosic biomass valorization: a study of plant biomass structure, composition, and enzymatic digestibility after being submitted to different pretreatment steps

Kane¹

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Enhancing cellulose nanofibrillation of eucalyptus Kraft pulp by combining enzymatic and mechanical pretreatments

Cited by 19 publications

References 49 publications

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

Valorization of pea by-products for the isolation of cellulosic microfibers: extraction and physico-chemical characterization

Lignocellulosic biomass valorization: a study of plant biomass structure, composition, and enzymatic digestibility after being submitted to different pretreatment steps

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