Deinking of soy bean oil based ink printed paper with lipases and a neutral surfactant

Mørkbak, A. L.; Degn, Peter; Zimmermann, Wolfgang

doi:10.1016/s0168-1656(98)00179-5

Cited by 24 publications

(8 citation statements)

References 5 publications

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“…The lipase activity was determined according to the previously described method with 2 mM p-nitrophenyl octanoate as the substrate in 0.1 M phosphate sodium buffer (pH 7.5) for 10 min at 35 °C (Morkbak et al 1999). One unit of lipase activity (U) was defined as the amount of lipase necessary to liberate 1 mol of p-nitrophenol per min.…”

Section: Enzyme Assaymentioning

confidence: 99%

“…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%

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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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Section: Enzyme Assaymentioning

confidence: 99%

Section: Design Of the Chimera Lip-eg1cdmentioning

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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show abstract

“…For example, a significant detrimental effect on physical properties of deinked paper was observed because of cellulose degradation caused by cellulase treatment in some cases (Lee et al 2017). Lipases prefer to deink the paper printed with soy bean oil based ink because of their ability to hydrolyze the triglycerides in vegetable-oil based inks into di, monoglycerides and glycerol (Morkbak et al 1999;Mohandass and Raghukumar 2005). It was reasonable to assume that cutinases could be used effectively alone or with lipases in deinking processes because of the multiple functions of cutinase and the complementary nature of the substrate specificities and catalysis patterns of both enzymes.…”

Section: Introductionmentioning

confidence: 99%

Engineering a Chimeric Lipase-cutinase (Lip-Cut) for Efficient Enzymatic Deinking of Waste Paper

et al. 2017

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Lipase and cutinase belong to the esterase family and have biological applications in many fields. To develop more efficient biocatalysts that can be used for waste paper deinking, a chimeric lipase-cutinase (LipCut) was constructed and successfully overexpressed in Pichia pastoris. The chimeric Lip-Cut exhibited lipase and cutinase activities that were 127% and 210% higher than their parent enzymes, respectively. Cut was superior to Lip in ink removal and improvement of paper brightness than Lip. The Lip-Cut displayed a better ink removal efficiency and paper brightness than that of the Lip, Cut, and Lip/Cut mixture. When the chimeric Lip-Cut was used, the ink removal efficiencies were 25.8% and 16.2% higher than that of the control-treated laser-printed paper and newspaper, which had sheet brightness values of 88% ISO and 59% ISO, respectively. The results demonstrated that the proper construction of bi-functional Lip-Cut could enhance the catalytic properties through the synergistic action of the two moieties because of the complementary advantages in the substrate specificities and catalysis patterns of both enzymes. This may provide an effective way to engineer more efficient bi-functional lipases and cutinases for deinking waste paper.

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“…It was claimed that the presence of univalent metal ions in a sulphopolyester-based flexographic ink inhibits ageing (cross-linking) of acrylic binders. The effect of different surfactants on the deinking process has also been investigated previously (Gecol et al 2001;Mørbak et al 1999;Rao, Stenius 1998).…”

mentioning

confidence: 96%

“…Ink properties such as pigment size and type of solvent used will strongly influence deinkability (Rangamannar et al 1992;Wasilewski 1987). Paper and fibre surface properties are important since they affect the ease of ink detachment.…”

mentioning

confidence: 99%

Influence of different storage conditions on deinking efficiency of waterbased flexographic ink from model cellulose surfaces and sheets

Forsström

Wågberg

2004

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY:The influence of UV-light, temperature, atmospheric environment and storage time on the ink detachment of water-based flexographic ink printed on model cellulose surfaces was investigated using an impinging jet cell equipment. The printed surfaces were deinked using a NaOH solution (pH = 10) and the deinking process was monitored using a microscope equipped with a CCD camera. Images were collected at different time intervals during the detachment process and image analysis was used to quantify the ink detachment from the surface. Hand sheets, (the same pulp as used for model surface preparation) were also printed and stored under the same conditions, after which they were reslushed and deinked. The deinking efficiency of the recycled sheets was evaluated using brightness and ERIC (Effective Residual Ink Concentration) values. It was shown that UV-light had a negative effect on ink detachment both from the model cellulose surfaces and from the hand sheets. At storage temperatures of 55°C, (dark conditions were used) a large negative effect was observed for the cellulose surfaces while only a small effect on the ink detachment could be seen for the hand sheets. Ink detachment from the hand sheets became more difficult when increasing the storage temperature above 55°C, as detected as a decrease in brightness of the recycled and deinked sheets. A further increase in the storage temperature to 105°C gave poorer ink detachment efficiency than storage under UV-light for the hand sheets. Air had a more negative effect on ink detachment than nitrogen. ADDRESS OF THE AUTHORS:Jennie Forsström (jenfor@kth.se) and Lars Wågberg (wagberg@pmt.kth.se):

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Deinking of soy bean oil based ink printed paper with lipases and a neutral surfactant

Cited by 24 publications

References 5 publications

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

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

Engineering a Chimeric Lipase-cutinase (Lip-Cut) for Efficient Enzymatic Deinking of Waste Paper

Influence of different storage conditions on deinking efficiency of waterbased flexographic ink from model cellulose surfaces and sheets

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