Enzymatic pretreatment for the improvement of dispersion and film properties of cellulose nanofibrils

Nie, Shuangxi; Zhang, Kun; Lin, Xuejiao; Zhang, Chenyuan; Yan, Depeng; Hang, Lingxia; Wang, Shuangfei

doi:10.1016/j.carbpol.2017.11.020

Cited by 165 publications

(50 citation statements)

References 34 publications

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“…Canada is known to be the leading producer of pulp and they are bleaching more than 10% its pulp via xylanase (Dhiman et al 2008a). In addition to that, several reports also suggest that the xylanase enzyme-mediated pretreatment can help in generation of cellulosic nanofibres (CNF) with improved crystallinity from unbleached bagasse and eucalyptus pulp (Nie et al 2018;Zhang et al 2018;Tao et al 2019). Zhang et al (2018) suggested that application of commercial Novozyme X2753 can simplify the CNF's production and purification process.…”

Section: Bio-bleachingmentioning

confidence: 99%

A detailed overview of xylanases: an emerging biomolecule for current and future prospective

Bhardwaj

Kumar

Verma

2019

Bioresour. Bioprocess.

300

105

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Xylan is the second most abundant naturally occurring renewable polysaccharide available on earth. It is a complex heteropolysaccharide consisting of different monosaccharides such as l-arabinose, d-galactose, d-mannoses and organic acids such as acetic acid, ferulic acid, glucuronic acid interwoven together with help of glycosidic and ester bonds. The breakdown of xylan is restricted due to its heterogeneous nature and it can be overcome by xylanases which are capable of cleaving the heterogeneous β-1,4-glycoside linkage. Xylanases are abundantly present in nature (e.g., molluscs, insects and microorganisms) and several microorganisms such as bacteria, fungi, yeast, and algae are used extensively for its production. Microbial xylanases show varying substrate specificities and biochemical properties which makes it suitable for various applications in industrial and biotechnological sectors. The suitability of xylanases for its application in food and feed, paper and pulp, textile, pharmaceuticals, and lignocellulosic biorefinery has led to an increase in demand of xylanases globally. The present review gives an insight of using microbial xylanases as an "Emerging Green Tool" along with its current status and future prospective.

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Section: Bio-bleachingmentioning

confidence: 99%

A detailed overview of xylanases: an emerging biomolecule for current and future prospective

Bhardwaj

Kumar

Verma

2019

Bioresour. Bioprocess.

300

105

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“…The enzyme pretreatment has a mild condition and a high selectivity and can make fibers produce holes, peeling, and fine fibrosis, which is conducive to the nanofibrillation of cellulose in subsequent mechanical processes and reduces the probability of blocking the homogeneous valve by cellulose slurry. The enzyme system could be multicomponent enzyme mixture [192][193][194] or the monocomponent [157,170,193,[195][196][197][198]. According to the reports, the monocomponent endoglucanase seems to give a better pretreatment effect [170,199,200].…”

Section: Enzyme Hydrolysismentioning

confidence: 99%

Recent Strategies in Preparation of Cellulose Nanocrystals and Cellulose Nanofibrils Derived from Raw Cellulose Materials

Xie

Yang

2018

International Journal of Polymer Science

219

128

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The recent strategies in preparation of cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) were described. CNCs and CNFs are two types of nanocelluloses (NCs), and they possess various superior properties, such as large specific surface area, high tensile strength and stiffness, low density, and low thermal expansion coefficient. Due to various applications in biomedical engineering, food, sensor, packaging, and so on, there are many studies conducted on CNCs and CNFs. In this review, various methods of preparation of CNCs and CNFs are summarized, including mechanical, chemical, and biological methods. The methods of pretreatment of cellulose are described in view of the benefits to fibrillation.

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“…Analysis on the mass loss was carried out between 25-550°C and two decomposition steps were observed for each sample. Initial mass loss that occurred at temperature less than 200°C was attributed to evaporation of adsorbed moisture [20]- [22]. Based on Fig.…”

Section: B Ftir Analysismentioning

confidence: 99%

Atmospheric Soda Pulping of Banana Stem

Mohamad*,

Jai*

2019

IJEAT

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Banana stem is one of the most explored non-wood lignocellulose due to its high cellulose content with small amount of lignin. The conventional pulping processes efficiently remove the lignin, but there is potential to reduce the energy and chemical consumptions due to the low lignin content of banana stem. In this work, soda pulping was carried out for 60-120 minutes using 16-20% w/v alkali charge at boiling temperature of 105°C. The efficiency of lignin removal at low temperature was evaluated using kappa number analysis. The effects of pulping time and alkali charge on pulp properties were investigated using fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Soda pulping using 18% w/v alkali charge at 10 liquid-to-solid ratio for 90 minutes under atmospheric pressure efficiently removed lignin with minimal cellulose degradation. Extended pulping time and concentrated alkali charge would induce cellulose degradation. FTIR analysis verified that alkaline pulping caused depolymerization on both lignin and cellulose. SEM images of banana stem showed ordered structure cellulose fibrils arrangement. Removal of lignin and hemicellulose was observed through smoother surface of the banana pulp. However, TGA analysis suggested that a better thermal stability could be achieved through pulping using 16% w/v alkali charge.

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Enzymatic pretreatment for the improvement of dispersion and film properties of cellulose nanofibrils

Cited by 165 publications

References 34 publications

A detailed overview of xylanases: an emerging biomolecule for current and future prospective

A detailed overview of xylanases: an emerging biomolecule for current and future prospective

Recent Strategies in Preparation of Cellulose Nanocrystals and Cellulose Nanofibrils Derived from Raw Cellulose Materials

Atmospheric Soda Pulping of Banana Stem

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