Effect of endoglucanases and hemicellulases in magnetic and flotation deinking of xerographic and laser-printed papers

Gübitz, Georg; Mansfield, Shawn D.; Böhm, Dirk; Saddler, John N.

doi:10.1016/s0168-1656(98)00130-8

Cited by 68 publications

(33 citation statements)

References 8 publications

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“…3). By contrast, 24 an increment of 2.5 units was obtained when magazine fibers were used, reaching 53% ISO 25 and 55% ISO brightness with Viscozyme and Ultraflo, respectively (Fig. 2).…”

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confidence: 91%

“…Other authors consider that endoxylanases provide the main activity (Berlin 9 et al 1997), promoting ink detachment due to hemicellulose hydrolysis on the fibers surface. 10 In any case, the combined action of the two activities has shown better deinking efficiencies 11 (Gübitz et al 1998; Lee et al 2007). In this sense, Viscozyme Wheat (containing 17 U/mg 12 endoglucanase activity estimated from glucose release from carboxymethylcellulose and 65 13 U/mg endoxylanase activity estimated from xylose release from birch xylan, Table 1) and 14 Ultraflo L (containing 23 U/mg endoglucanase activity estimated from glucose release from 15 carboxymethylcellulose and 61 U/mg endoxylanase activity estimated from xylose release 16 from birch xylan, Table 1) showed mainly both endoglucanase and endoxylanase activities, 17 explaining their effectiveness deinking secondary fibers from newspapers and magazines.…”

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confidence: 99%

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Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system

Ibarra

Monte

Blanco

et al. 2012

Journal of Industrial Microbiology and Biotechnology

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1The use of enzymes has been suggested as an environmentally-friendly alternative to 2 complement conventional chemical deinking in the recycling of recovered paper. This study 3 compares the use of carbohydrate hydrolases versus laccase-mediator system for deinking 4 printed fibers from newspapers and magazines. For this purpose, two commercial enzyme 5 preparations with endoglucanase and endoxylanase activities (Viscozyme Wheat from 6Aspergillus oryzae and Ultraflo L from Humicola insolens) and a commercial laccase 7 (NS51002 from Trametes villosa), the latter in the presence of synthetic or natural (lignin-8 related) mediators, were evaluated. The enzymatic treatments were studied at laboratory scale, 9 using a standard chemical deinking sequence consisting of pulping, alkaline deinking and 10 peroxide bleaching stages. Then, handsheets were prepared and their brightness, residual ink 11 concentration, and strength properties were measured. Among the different enzymatic 12 treatments assayed, both carbohydrate hydrolases were found to deink the secondary fibers 13 more efficiently. Brightness increased up to 3-4% ISO on newspaper fibers, being Ultraflo 14 20% more efficient in the ink removal. Up to 2.5% ISO brightness increase was obtained 15 when magazine fibers were used, being Viscozyme 9% more efficient in the ink removal. As 16 regards laccase-mediator system, alone or combined with carbohydrate hydrolases, it was 17 ineffective deinking both newspaper and magazine fibers, resulting in pulps with worse 18 brightness and residual ink concentration values. However, pulp deinking by laccase-mediator 19 system was displayed when secondary fibers rich in lignin, i.e. printed cardboard, were used, 20 obtaining up to 3% ISO brightness increase and lower residual ink concentrations. 21 22

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“…3). By contrast, 24 an increment of 2.5 units was obtained when magazine fibers were used, reaching 53% ISO 25 and 55% ISO brightness with Viscozyme and Ultraflo, respectively (Fig. 2).…”

mentioning

confidence: 91%

mentioning

confidence: 99%

Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system

Ibarra

Monte

Blanco

et al. 2012

Journal of Industrial Microbiology and Biotechnology

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show abstract

“…Because endoglucanase and lipase have shown high deinking efficiency (Gübitz et al 1998;Morkbak et al 1999;Marques et al 2003;Pelach et al 2003;Vyas and Lachke 2003), the authors assumed that the combined use of two enzymes could promote better deinking efficiency. With such assumption, a chimeric enzyme with endoglucanase and lipase activities was constructed in this study by an end-to-end fusion technique, in which the Lip catalytic domain at N-terminus was fused with the EG1 catalytic domain at C-terminus (Khandeparker and Numan 2008).…”

Section: Design Of the Chimera Lip-eg1cdmentioning

confidence: 99%

“…Previous reports had demonstrated the successful use of various enzymes for waste paper deinking, like cellulases, xylanases, pectinases, amylases, lipase, and laccases (Bajpai 1999;Zhang et al 2008;Nyman and Hakala 2011;Pathak et al 2011Pathak et al , 2014Zhang et al 2017). Among the different enzymes assayed, endoglucanase has shown the most promising results for the deinking of different waste papers (Gübitz et al 1998; Marques…”

Section: Introductionmentioning

confidence: 99%

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

Liu¹,

Long²,

Wu³

et al. 2017

BioResources

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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.

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“…[8][9][10] It was anticipated that magnetic separation would decrease the incidence of toner specks because it easily separates particles over several hundred micrometers in size. Such particles are not removed easily by flotation.…”

Section: Introductionmentioning

confidence: 99%

Coagulation Using Kerosene for Magnetic Deinking of Waste Office Paper

et al. 2003

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A method for disintegrating waste office paper using kerosene was reported in our previous paper, which achieved almost a 100% liberation of toner from paper fibers. The liberated toner must be completely separated to realize effective deinking. Recently, a new method for deinking waste officer paper by magnetic separation after hetero-coagulation of magnetic and non-magnetic toner by 1-octadecanol was reported by Augusta et al. Under this method, coagulation was carried out at 72 C. The 1-octadecanol liquid was then cooled to produce strong solid coagulates. As reported in our previous paper, kerosene has the ability to soften toner, and strong coagulates for magnetic separation may be produced by their adhesion when used as a flocculant. The present study investigated the size of toner particles liberated by the kerosene disintegration method, and compared the bonding strength between the toner particles coagulated by the addition of kerosene as a flocculant to those coagulated with 1-octadecanol. After these investigations, the coagulating and deinking properties of kerosene and 1-octadecanol were compared by rejecting toner coagulates with a neodymium-boron magnet. The results showed that nearly perfect deinking can be achieved with little paper loss, even in ambient temperature, due to the large and strong coagulates produced by this method. When kerosene was used in the disintegration and coagulation stages, the average coagulate size was 1114 mm, and a deinking percentage of 98.4% was attained through separation with a neodymium-boron magnet.

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Effect of endoglucanases and hemicellulases in magnetic and flotation deinking of xerographic and laser-printed papers

Cited by 68 publications

References 8 publications

Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system

Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system

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

Coagulation Using Kerosene for Magnetic Deinking of Waste Office Paper

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