Enzymatic upgrade of old paperboard containers

Pala, Helena; Lemos, Margarida; Мота, М.; Gama, Miguel

doi:10.1016/s0141-0229(01)00380-5

Cited by 51 publications

(46 citation statements)

References 6 publications

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“…Drainage rate of pulp of CBD-modified cellulose decreases compared with that of unmodified cellulose fibres [18]. This is consistent with the reduction of inter-surface repulsion, which results in fibre agglomeration and reduction of the drainability.…”

Section: Interaction Of the Surfaces Of Cellulose Modified By Cbdsupporting

confidence: 77%

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Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Nigmatullin

Lovitt

Wright

et al. 2004

Colloids and Surfaces B: Biointerfaces

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Colloidal probe microscopy has been used to study the interaction between model cellulose surfaces and the role of cellulose binding domain (CBD), peptides specifically binding to cellulose, in interfacial interaction of cellulose surfaces modified with CBDs.The interaction between pure cellulose surfaces in aqueous electrolyte solution is dominated by double layer repulsive forces with the range and magnitude of the net force dependent on electrolyte concentration. AFM imaging reveals agglomeration of CBD adsorbed on cellulose surface. Despite an increase in surface charge owing to CBD binding to cellulose surface, force profiles are less repulsive for interactions involving, at least, one modified surface. Such changes are attributed to irregularity of the topography of protein surface and non-uniform distribution of surface charges on the surface of modified cellulose.Binding double CBD hybrid protein to cellulose surfaces causes adhesive forces at retraction, whereas separation curves obtained with cellulose modified with single CBD show small adhesion only at high ionic strength. This is possibly caused by the formation of the cross-links between cellulose surfaces in the case of double CBD.

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Section: Interaction Of the Surfaces Of Cellulose Modified By Cbdsupporting

confidence: 77%

“…For example, CBD, showing non-hydrolytic disruptive activity on cellulose fibers, causes a release of microfibrils as small particles and prevents the flocculation of microcrystalline bacterial cellulose [15][16][17][18]. These improve processability of the cellulose fibers and paper strength.…”

Section: Introductionmentioning

confidence: 99%

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Nigmatullin

Lovitt

Wright

et al. 2004

Colloids and Surfaces B: Biointerfaces

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“…In previous work (Pala et al, 2001), it was shown that although being very efficient for drainage improvement, enzymatic preparations such as Celluclast could be detrimental to paper strength.…”

Section: Resultsmentioning

confidence: 99%

“…The protein amount (94 mg/ml) was determined by the Bradford method, using serum albumin as standard (Bradford, 1976). Total cellulase (57 FPU/ml), Endoglucanase (26 U/ml) and Xylanase (680 U/ml) activities were measured by the filter paper, carboxymethylcellulase, and the xylan oat-spelt assays, respectively (Pala et al, 2001). Released sugars were measured by the dinitrosalicylic acid method, using glucose as standard (Bernfeld, 1955).…”

Section: Enzymementioning

confidence: 99%

Enzymatic Modification of Paper Fibres

Pala

Мота

Gama

2002

Biocatalysis and Biotransformation

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The enzymatic mode of action in paper fibre upgrading is still uncertain. In an attempt to clarify how enzymes modify pulp and paper properties, several parameters were analysed in the present work: (i) thermal analysis of the water -solid surface interactions; (ii) fibre cake permeability; (iii) particle size analysis. The results obtained suggest that enzymes modify the interfacial properties of fibres, increasing the water affinity, which in turn change the technical properties of pulp and paper, such as drainability and strength. The modification of paper and pulps following a treatment with cellulosebinding domains further supports this hypothesis.

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“…Reducing sugar released during enzymatic hydrolysis was determined using the DNS method at a wavelength of 540 nm (Pala et al 2001). Reducing sugar yield (RSY) was calculated using Eq.…”

Section: Chemical Analysismentioning

confidence: 99%

Wet Oxidation Pretreatment of Wood Pulp Waste for Enhancing Enzymatic Saccharification

Liu

Wang

et al. 2015

BioResources

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Effective pretreatment of wood pulp waste is important for enhancing enzymatic saccharification. For this reason, wet oxidation process conditions were considered with the hypothesis that the alkaline oxygen conditions would favor delignification and hydrolysis of lignocellulose. Enzymatic saccharification was greatly improved to 42.9% in terms of reducing sugar yield under the conditions of pH = 10, oxygen pressure = 1.2 MPa, time = 15 min, and temperature = 195 °C. A total of 39% of lignin and 73% of hemicellulose were removed and dissolved into the hydrolyzate. Furthermore, the chemical structure, crystallinity, and morphology of the treated substrate were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM).

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Enzymatic upgrade of old paperboard containers

Cited by 51 publications

References 6 publications

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Enzymatic Modification of Paper Fibres

Wet Oxidation Pretreatment of Wood Pulp Waste for Enhancing Enzymatic Saccharification

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