An ecofriendly cost effective enzymatic methodology for deinking of school waste paper

Singh, Avtar; Yadav, Ravi Dutt; Kaur, Amanjot; Mahajan, Ritu

doi:10.1016/j.biortech.2012.06.050

Cited by 72 publications

(35 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During deinking, the ink attached to the surface of recycled cellulose fibres was released by the enzymatic hydrolysis of carbohydrates, leading to the peeling of individual fibres or bundles [106]. The waste papers from various fields offer as important raw material for the pulp and paper industries, as the recycling of used papers reduces the solid wastes and also lessens the burden of deforestation for wood fibres [107,108]. Enzymatic deinking of waste papers, especially employing the mixtures of cellulase and hemicellulase, enhance the quality and brightness of the recycled paper [109][110][111].…”

Section: Paper and Pulp Industriesmentioning

confidence: 99%

An Overview on Fungal Cellulases with an Industrial Perspective

Sreedharan¹

2016

J Nutr Food Sci

View full text Add to dashboard Cite

Lignocellulose is the most abundant biopolymer available on earth. Hydrolysis of lignocellulose into fermentable sugars, sugar acids and phenolics is the pre-requisite for its successful exploitation as substrates for the large scale production of industrially significant value added products. Though remarkable collection of lignocellulolytic microorganisms has been brought to limelight, only a few especially fungi have been studied extensively as they secrete copious lignocellulolytic enzymes extracellularly. Enzymatic hydrolysis of lignocelluloses is carried out by a group of enzymes viz., cellulases, hemicellulases, ligninases in unison or individually, and are collectively known as lignocellulolytic enzymes. In this light of this background, followed by a short introduction on lignocellulose, lignocellulolytic enzymes and mainly focused on fungal cellulase, this review discusses recent approaches on the production of cellulase by submerged and solid-state fermentation strategies; current knowledge on the purification, characterisation of cellulase; and finally concluded with detailed industrial applications of fungal cellulase.

show abstract

Section: Paper and Pulp Industriesmentioning

confidence: 99%

An Overview on Fungal Cellulases with an Industrial Perspective

Sreedharan¹

2016

J Nutr Food Sci

View full text Add to dashboard Cite

show abstract

“…In the waste paper recycling process, the printed ink in the paper needs to be removed by a deinking process. Deinking is mainly comprised of two general procedures, including the release of ink particles from the fibre surface using chemical or enzymatic methods, and the removal of released ink from the pulp slurry by washing or flotation (Singh et al 2012). During conventional chemical deinking, large amounts of chemicals, such as sodium hydroxide, sodium carbonate, sodium silicate, hydrogen peroxide, surfactants, and chelating agents, are used by manufacturers, which leads to the generation of hazardous effluents (Heise et al 1996;Zollner and Schroeder 1998).…”

Section: Introductionmentioning

confidence: 99%

The Enzymatic Deinking of Waste Papers by Engineered Bifunctional Chimeric Neutral Lipase – Endoglucanase

Liu¹,

Long²,

Wu³

et al. 2017

BioResources

View full text Add to dashboard Cite

Endoglucanase and lipase showed good deinking efficiency for waste papers. The performances could be greatly improved further by the combined use of the two enzymes. To reduce the enzyme production cost and enhance synergistic action of endoglucanase and lipase on laser-printed paper and newspaper, a chimeric enzyme with endoglucanase and lipase activity was constructed and expressed in Pichia pastoris. The data indicated that the chimera Lip-EG1CD improved the ink removal efficiencies and sheet brightness better than a single enzyme or a mixture of two enzymes. The chimera Lip-EG1CD demonstrated an 89% removal of toner on both papers and 91% ISO and 60% ISO sheet brightness for laser-printed paper and newspaper, respectively. Handsheet strength was also clearly improved. It revealed that the combined deinking of endoglucanase and lipase on waste papers could be strengthened by constructing proper chimera due to intramolecular synergistic action. This would be useful for developing an economical process for waste paper recycling.

show abstract

“…They have been used widely in the conversion of lignocelluloses into fermentable sugars and prebiotic oligosaccharides (Juturu and Wu 2011;Shi et al 2013;Amel et al 2016). They can also be used to improve the quality of breads and beverages, enhance the digestibility of animal feeds, and improve the bleaching and deinking of paper (Huang et al 2006;Dhiman et al 2008;Garg et al 2009;Maity et al 2012;Singh et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Salt-Tolerant and Cold-Adapted Xylanase from Bacillus cellulosilyticus

Sun

Shi

et al. 2016

BioResources

View full text Add to dashboard Cite

A xylanase (Xyn10A) gene from the saline-alkali-tolerant microorganism Bacillus cellulosilyticus DSM 2522 was cloned and expressed in Escherichia coli BL21 (DE3). The open reading frame was composed of 1008 base pairs, and it encoded 335 amino acid residues belonging to glycosyl hydrolase family 10. The optimal temperature and pH of the purified Xyn10A were 40 °C and 8.0, respectively. The Xyn10A was sensitive to heat and showed obvious cold-adapted activity, retaining 38.3%, 55.7%, and 82.9% of the optimal activity at 4, 20, and 30 °C, respectively. Xyn10A also showed a high level of NaCl tolerance. The highest activity was observed with 1.5 M NaCl. The specific enzyme activity of Xyn10A was as much as 163.8 U/mg. Kinetic assays showed that Km, Vmax, and Kcat were 2.56 mg/mL, 202.5 μM/min/mg, and 132.6 /s, respectively. Additionally, the main hydrolysis products using birchwood xylan as substrate were xylobiose, xylotriose, and xylotetraose, as determined by thin layer chromatography analysis. As a cold-adapted and salt-tolerant enzyme, Xyn10A is an ideal candidate for further research and biotechnological applications.

show abstract

An ecofriendly cost effective enzymatic methodology for deinking of school waste paper

Cited by 72 publications

References 12 publications

An Overview on Fungal Cellulases with an Industrial Perspective

An Overview on Fungal Cellulases with an Industrial Perspective

The Enzymatic Deinking of Waste Papers by Engineered Bifunctional Chimeric Neutral Lipase – Endoglucanase

Characterization of a Salt-Tolerant and Cold-Adapted Xylanase from Bacillus cellulosilyticus

Contact Info

Product

Resources

About