Kraft pulp biobleaching using an extracellular enzymatic fluid produced by Pycnoporus sanguineus

Eugenio, María E.; Mc, Sastre Santos; Carbajo, José María; Martín, Juan A.; Martín‐Sampedro, Raquel; González, Aldo; Villar, Juan C.

doi:10.1016/j.biortech.2009.09.084

Cited by 44 publications

(39 citation statements)

References 17 publications

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“…1). These results are consistent with those reported elsewhere (Eugenio et al 2010(Eugenio et al , 2011Valls and Roncero 2009). However, with the two enzymatic treatments carried out in sequence, a slight increase in the kappa number was found after the laccase stage.…”

Section: Pulp Characterizationsupporting

confidence: 83%

“…Thus, all bleached pulps had a DP in the range of 930 to 1010. These results indicate that the biobleaching process causes no significant degradation of the polysaccharide chains, which is consistent with findings reported elsewhere (Eugenio et al 2010;Oudia et al 2008). However, after the stage in which xylanase and laccase were applied jointly, an increase in viscosity was observed.…”

Section: Pulp Characterizationsupporting

confidence: 82%

“…A plausible explanation for this finding could be that these enzymes render lignin easier to remove in the subsequent chemical bleaching, as has been reported also elsewhere (Eugenio et al 2010(Eugenio et al , 2011MartinSampedro et al 2011a;Valls and Roncero 2009). Similar delignification rates were obtained after the three biobleaching sequences (37.5% LEP, 38.8% (X+L) EP, and 37.3% XLEP), but when xylanase and laccase were applied in the same step, the delignification rate was highest.…”

Section: Pulp Characterizationmentioning

confidence: 56%

“…These enzymes could help to address the environmental concerns and the low selectivity inherent to the application of the Elemental Chlorine Free (ECF) and Totally Chlorine Free (TCF) bleaching sequences, respectively. Many researchers have pretreated pulps with enzymes, mainly with laccase, and have reported that enzymatically pretreated pulps require smaller amounts of chemicals in subsequent bleaching, that the quality of the pulps is maintained, if not improved, and that the pollutant load of the process effluents is reduced (Eugenio et al 2010;Moldes et al 2008;Moldes and Vidal 2011;Valls et al 2012;Viikari et al 1986). The interest of the use of laccases lies in the fact that these enzymes oxidize a wide variety of phenolic compounds (Thurston 1994) with only the requirement of molecular oxygen.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of TCF Bleaching of Olive Tree Pruning Residue Pulp by Addition of a Laccase and/or Xylanase Pre-Treatment

Martín‐Sampedro¹,

Rodríguez²,

Requejo³

et al. 2012

BioResources

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aThis study aimed at assessing the biobleachability of soda pulps obtained from olive tree pruning residue. The enzymatic (LMS) pretreatment was applied prior to a simple totally chlorine free (TCF) bleaching sequence, consisting of an alkaline extraction and a hydrogen peroxide stage. Additionally, the effect of adding xylanase jointly with or prior to LMS was evaluated. All of these enzymatic pre-treatments were associated with an enhancement of the bleaching sequence. The best results were found when both enzymes were applied in the same stage: lowest hydrogen peroxide consumption (63 percent); kappa number, 11.6; brightness, 46 percent ISO. The mechanical properties observed were similar to those reported by other authors who have studied pulps from olive tree pruning residue. Finally, bleached pulps were subjected to accelerated ageing in order to assess the evolution of brightness and colorimetric properties. Although biobleached pulps showed lower stability upon ageing, the best optical properties, even after ageing, were observed in pulps treated with both xylanase and laccase.

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Section: Pulp Characterizationsupporting

confidence: 83%

Section: Pulp Characterizationsupporting

confidence: 82%

Section: Pulp Characterizationmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvement of TCF Bleaching of Olive Tree Pruning Residue Pulp by Addition of a Laccase and/or Xylanase Pre-Treatment

Martín‐Sampedro¹,

Rodríguez²,

Requejo³

et al. 2012

BioResources

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show abstract

“…Based on the response surfaces, if excessive cellulose degradation at the end of the LEP sequence is to be minimized, an L stage should be operated at a short reaction time with a medium laccase and mediator dosage level. These observations were consistent with the findings previously reported by Fillat and Roncero (2009) impact on carbohydrate degradation during the biobleaching sequence, and this effect accounts for the high selectivity of biodelignification without lowering pulp viscosity (Oudia et al 2008;Eugenio et al 2010a). Figure 5 shows the response surfaces for hydrogen peroxide consumption during the P stage (Fig.…”

Section: Enzymatic Bleaching Process Optimizationsupporting

confidence: 81%

Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment

García-Fuentevilla¹,

Martín‐Sampedro²,

Carbajo³

et al. 2015

BioResources

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A TCF bleaching sequence consisting of a urea pretreatment stage (U), laccase-mediator system stage (L), alkaline extraction stage (E), and hydrogen peroxide bleaching stage (P) was used to study the effect of five independent variables on the dependent variables pulp properties, hydrogen peroxide consumption, and residual enzyme activity. Results showed that the most influential variable was L stage pulp consistency, followed by mediator and laccase dosages. On the other hand, oxygen pressure did not have a significant effect. The optimal UL partial sequence significantly enhanced the EP bleaching sequence: 49.8% vs. 33.4% delignification, up to 65.6% ISO vs. 56.3% ISO bleached brightness, and 50.3% vs. 89.9% peroxide consumption in the P stage. The ULE partial sequence also improved an ECF bleaching sequence (ULED0E1D1)

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An alkalophilic laccase from Rheinheimera species isolate: Production and biobleaching of kraft pulp

Virk

Capalash

Sharma

2012

Biotechnology Progress

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Medium optimization was carried out to enhance laccase production from a novel Rheinheimera species, isolated from industrial effluent. Out of the 15 variables tested by Placket-Burman design (PBD)-yeast extract, soyabean meal, and peptone were the positively significant ones, enhancing laccase production. Both simple and complex sugars showed a negative effect on laccase production. Central composite design (CCD) of experiments, using the three positively significant variables in combinations, showed that laccase production was not affected by molar carbon, molar nitrogen levels or molar C/N ratio. Maximum laccase yield of 2.5 × 10(5) nkat L(-1) , 31 fold enhancement over the unoptimized medium, was achieved when soyabean meal (0.6%) was used alone as medium showing that laccase production was substrate dependent. Laccase was used, in the presence of 2 mM ABTS, for the biobleaching of eucalyptus kraft pulp resulting in kappa number reduction by 20% and brightness increase by 2.9%. Biobleaching improved further by sequential application of an alkalophilic xylanase (X) and laccase-ABTS system (LAS) that decreased kappa number by 10, 15, and 35%, increased brightness by 2.7, 3.2, and 5.9% as compared to X treated, LAS treated and untreated control, respectively. XLAS treatment resulted in 15, 13, 10.9% increase in burst factor, tear factor, and viscosity with a 20% reduced consumption of elemental chlorine and hypochlorite.

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Kraft pulp biobleaching using an extracellular enzymatic fluid produced by Pycnoporus sanguineus

Cited by 44 publications

References 17 publications

Improvement of TCF Bleaching of Olive Tree Pruning Residue Pulp by Addition of a Laccase and/or Xylanase Pre-Treatment

Improvement of TCF Bleaching of Olive Tree Pruning Residue Pulp by Addition of a Laccase and/or Xylanase Pre-Treatment

Enhancement of TCF and ECF Bleaching Processes by Urea and Enzymatic Pretreatments: Optimization of a Laccase-Mediator Pretreatment

An alkalophilic laccase from Rheinheimera species isolate: Production and biobleaching of kraft pulp

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