Chapter 6 Microbial Enzymes for Pulp and Paper Industry

Pathak, Puneet; Kaur, Prabhjot; Bhardwaj, Nishi Kant

doi:10.1201/9781315367880-7

Cited by 10 publications

(4 citation statements)

References 129 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, galactoglucomannan obtained from process waters of thermomechanical pulping process demonstrates an MW between 39,000 and 46,000 g/mol [ 48 ] and can be applied as a replacement for gear or xanthan gums [ 47 ]. However, the relatively low heating values of hemicelluloses and cellulose [ 49 , 50 ] limit their applications as fuel.…”

Section: Introductionmentioning

confidence: 99%

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Tarasov

Leitch

Fatehi

2018

Biotechnol Biofuels

406

177

View full text Add to dashboard Cite

The complexity of lignin and hemicellulose segmentation has been known since the middle of the ninetieth century. Studies confirmed that all lignin units in coniferous species and 47–66% of lignin moieties in deciduous species are bound to hemicelluloses or cellulose molecules in lignin–carbohydrate complexes (LCC). Different types and proportions of lignin and polysaccharides present in biomass lead to the formation of LCC with a great variety of compositions and structures. The nature and amount of LCC linkages and lignin substructures affect the efficiency of pulping, hydrolysis, and digestibility of biomass. This review paper discusses the structures, compositions, and properties of LCC present in biomass and in the products obtained via pretreating biomass. Methods for extracting, fractionating, and analyzing LCC of biomass, pulp, and spent pulping liquors are critically reviewed. The main perspectives and challenges associated with these technologies are extensively discussed. LCC could be extracted from biomass following varied methods, among which dimethyl sulfoxide or dioxane (Björkman’s) and acetic acid (LCC-AcOH) processes are the most widely applied. The oxidation and methylation treatments of LCC materials elucidate the locations and frequency of binding sites of hemicelluloses to lignin. The two-dimensional nuclear magnetic resonance analysis allows the identification of the structure and the quantity of lignin–carbohydrate bonds involved in LCC. LCC application seems promising in medicine due to its high anti-HIV, anti-herpes, and anti-microbial activity. In addition, LCC was successfully employed as a precursor for the preparation of spherical biocarriers.

show abstract

Section: Introductionmentioning

confidence: 99%

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Tarasov

Leitch

Fatehi

2018

Biotechnol Biofuels

406

177

View full text Add to dashboard Cite

show abstract

“…White-rot fungi, with the ability to degrade lignocellulosic material, are valued in the paper, textile, and food industries for their ability to produce various lignocellulosic-degrading enzymes [ 1 , 2 , 3 ]. These fungi differ from brown-rot in that they can degrade all lignocellulose constituents (lignin, cellulose, and hemicellulose) producing CO 2 as a byproduct of this metabolism [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Enzyme Activities of Five White-Rot Fungi in the Presence of Nanocellulose

Reyes

Poulin

Nyström

et al. 2021

JoF

View full text Add to dashboard Cite

White-rot fungi can degrade all lignocellulose components due to their potent lignin and cellulose-degrading enzymes. In this study, five white-rot fungi, Trametes versicolor, Trametes pubescens, Ganoderma adspersum, Ganoderma lipsiense, and Rigidoporus vitreus were tested for endoglucanase, laccase, urease, and glucose-6-phosphate (G6P) production when grown with malt extract and nanocellulose in the form of TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidized cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC). Results show that temperature plays a key role in controlling the growth of all five fungi when cultured with malt extract alone. Endoglucanase activities were highest in cultures of G. adspersum and G. lipsiense and laccase activities were highest in cultures of T. versicolor and R. vitreus. Urease activities were highest in cultures of G. adspersum, G. lipsiense, and R. vitreus. Glucose-6-phosphate levels also indicate that cells were actively metabolizing glucose present in the cultures. These results show that TEMPO-oxidized CNF and CNC do not inhibit the production of specific lignocellulose enzymes by these white-rot fungi. The apparent lack of enzymatic inhibition makes TEMPO-oxidized CNF and CNC excellent candidates for future biotechnological applications in combination with the white-rot fungi studied here.

show abstract

“…Enzyme treatment with cellulases was shown to signi cantly reduce vessel picking 8,9 . Treatment of unbleached hardwood pulp with a mixture of cellulases and xylanases was found to chemically change the hardwood vessel elements, rendering them prone to break under normal mill re ning 10,11 . The in uence of different commercial cellulases and xylanases or their mixtures on the quality of different bleached kraft pulps was also investigated 12 .…”

Section: Introductionmentioning

confidence: 99%

Eucalyptus globulus vessels enzymatic passivation: effect of pore structure on bulk and surface chemistry

Vaz

Coelho

Costa

et al. 2023

Preprint

View full text Add to dashboard Cite

Hardwood vessel elements generate problems in industrial uncoated wood-free printing paper operation, causing vessel picking and ink refusal. These problems are mitigated using mechanical refining at the cost of paper quality. Vessel enzymatic passivation, altering its adhesion to the fiber network and reducing its hydrophobicity is a way of improving paper quality. The object of this paper is to study how the enzymatic treatment by xylanase and by an enzymatic cocktail containing cellulases and laccases affect elemental chlorine free bleached Eucalyptus globulus vessel and fiber porosities, bulk, and surface chemical compositions. Thermoporosimetry revealed the vessel structure to be more porous, surface analysis showed its lower O/C ratio and bulk chemistry analysis its higher hemicellulose content. Enzymes had different effects on porosity, bulk and surface composition of fibers and vessels, affecting vessel adhesion and hydrophobicity. It is proposed that differences in vessel and fiber porosity structures affect the enzymatic attacks, eventually causing vessel passivation.

show abstract

Chapter 6 Microbial Enzymes for Pulp and Paper Industry

Cited by 10 publications

References 129 publications

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Enzyme Activities of Five White-Rot Fungi in the Presence of Nanocellulose

Eucalyptus globulus vessels enzymatic passivation: effect of pore structure on bulk and surface chemistry

Contact Info

Product

Resources

About