Now showing items 1-20 of 79

  • A facile and green method to hydrophobize films of cellulose nanofibrils and silica by laccase-mediated coupling of nonpolar colloidal particles 

    Cusola Aumedes, Oriol; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Rojas, Orlando J. (2014-10-01)
    Article
    Restricted access - publisher's policy
    Hydrophobic particles based on dodecyl 3,4,5-trihydroxybenzoate (LG) were coupled onto the surface of cellulose nanofibrils (CNFs) and silica by treatment with a multicomponent colloidal system (MCS) derived from the ...
  • Alternative chemo-enzymatic treatment for homogeneous and heterogeneous acetylation of wood fibers 

    Quintana, Elisabet; Ago, Mariko; Valls Vidal, Cristina; Roncero Vivero, María Blanca; Rojas, Orlando J. (2018-07-18)
    Article
    Open Access
    A new chemo-enzymatic treatment is proposed to produce cellulosic fibers suitable for heterogeneous- or homogeneous-phase acetylation. The procedure included enzymatic (laccase–violuric acid) lignin removal from the precursor ...
  • An approach to industrial application: influence of black liquor and pH on xylanase efficiency in bleaching of eucalyptus kraft pulp 

    Fillat Latorre, Úrsula; Roncero Vivero, María Blanca; Bassa, Alexandre; Sacón, Vera Maria (American Chemical Society (ACS), 2010-11-17)
    Article
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    To obtain a more realistic appraisal of the potential efficiency of xylanases in the industrial bleaching, the influence of pH and the presence of black liquor (measured as COD) on the bleaching efficiency of two commercial ...
  • An enzyme-catalysed bleaching treatment to meet dissolving pulp characteristics for cellulose derivatives applications 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2013-11)
    Article
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    Bleached cellulose with good end-properties (_90% ISO brightness and 62% cellulose preservation) was obtained by using a totally chlorine-free biobleaching process (TCF). Unbleached sulphite cellulose was treated with ...
  • A new approach to the internal sizing of paper via biotechnological processes 

    García Ubasart, Jordi; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa (2011)
    Conference report
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    This work deals with the study of a new biotechnological procedure, employing laccase in combination with hydrophobic compounds, for the biomodification of fibres and the internal sizing of paper. Cellulose fibres from ...
  • A new procedure for the hydrophobization of cellulose fibre using laccase and a hydrophobic phenolic compound 

    García Ubasart, Jordi; Colom Pastor, José F.; Vila Babarro, Carlos; Hernández, Núria; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa (2012-05)
    Article
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    A new biotechnological procedure using laccase in combination with a hydrophobic phenolic compound (lauryl gallate) for the hydrophobization of cellulose fibres and internal sizing of paper was developed. Cellulose fibres ...
  • A new use for TCF pulp with a high hexenuronic acid content 

    Valls Vidal, Cristina; Roncero Vivero, María Blanca (2013)
    Conference report
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    The importance of HexA groups lies on their influence on the bleaching process and the properties of the resulting pulp. In this work, various aspects of HexA were examined in order to elucidate their role in eucalyptus ...
  • A novel enzymatic approach to nanocrystalline cellulose preparation 

    Beltramino, Facundo; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Valls Vidal, Cristina (2018-06-01)
    Article
    Open Access
    In this work, conditions for an enzymatic pretreatment prior to NCC isolation from cotton linter were assessed. Different cellulase doses and reaction times were studied within an experimental design and NCC were obtained. ...
  • Antioxidant activity of xylooligosaccharides produced from glucuronoxylan by Xyn10A and Xyn30D xylanases and eucalyptus autohydrolysates 

    Valls Vidal, Cristina; Pastor Blasco, Francisco Ignacio Javier; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca; Diaz Lucea, M. Pilar; Martinez, Josefina; Valenzuela Mayorga, Susana Valeria (2018-08-15)
    Article
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    Antioxidant activity of xylooligosaccharides (XOS) released from beechwood and birchwood glucuronoxylans by two different xylanases, one from family GH10 (Xyn10A) and another from family GH30 (Xyn30D) was examined. The ...
  • Application of surface enzyme treatments using laccase and a hydrophobic compound to paper-based media 

    Cusola Aumedes, Oriol; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2013-01-11)
    Article
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    A new approach for the hydrophobization of finished cellulosic substrates based on a previously reported enzymatic technique is proposed. Commercial finished paper was hydrophobized by using laccase from Trametes villosa ...
  • Assessing the environmental impact of biobleaching: effects of the operational conditions 

    Valls Vidal, Cristina; Quintana, Elisabet; Roncero Vivero, María Blanca (2012-01)
    Article
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    The environmental impact of enzyme bleaching stages applied to oxygen-delignified eucalypt kraft pulp was assessed via the chemical oxygen demand (COD), color, absorbance spectrum, residual enzyme activity and Microtox ...
  • Assessing the use of xylanase and laccases in biobleaching stages of a TCF sequence for flax pulp 

    Fillat Latorre, Amanda; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa (2011-12)
    Article
    Restricted access - publisher's policy
  • Assessment of the potential of enzymes to produce dissolving pulps 

    Valls Vidal, Cristina; Quintana, Elisabet; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (Universidade de Aveiro, 2018)
    Conference lecture
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    In this work, a totally chlorine free (TCF) sequence including a laccase-mediator system was developed in a softwood sulfite pulp. Then, purification was carried out employing strong alkaline extractions and hydrolytic ...
  • Bacterial cellulose for increasing barrier properties of paper products 

    Fillat Latorre, Amanda; Martinez, Josefina; Valls Vidal, Cristina; Cusola Aumedes, Oriol; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Valenzuela, Susana V.; Diaz Lucea, M. Pilar; Pastor Blasco, Francisco Ignacio Javier (2018-08-07)
    Article
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    Bacterial cellulose was combined with wood cellulose papers in order to obtain biomaterials with increased barrier properties. For this purpose, different parameters were assessed: two producing bacterial strains ...
  • Biobleaching of high quality pulps with laccase mediator system: influence of treatment time and oxygen supply 

    Fillat Latorre, Úrsula; Roncero Vivero, María Blanca (Elsevier, 2009)
    Article
    Open Access
    In this study we examined the influence of the treatment time and addition of oxygen on the efficiency of a laccase mediator system (L) applied to flax pulp at atmospheric pressure. The redox potential and the dissolved ...
  • Biorefinery: the paper mill of tomorrow 

    Vidal Lluciá, Teresa; Torres López, Antonio Luis; Valls Vidal, Cristina; Cusola Aumedes, Oriol; Quintana, Elisabet; Andreu Terrén, Glòria; Aracri, Elisabetta; Fillat Latorre, Amanda; García Ubasart, Jordi; Beltramino, Facundo; Clemente Escuin, Antonio; Roncero Vivero, María Blanca (Campus de Terrassa de la UPC, 2013-06-13)
    Conference report
    Open Access
  • Bleached dissolving pulps applying laccase treatments 

    Quintana, Elisabet; Valls Vidal, Cristina; Roncero Vivero, María Blanca (2012)
    Conference report
    Restricted access - publisher's policy
    A biobleaching sequence, using a laccase enzyme (Trametes Villosa) in combination with different mediators, was applied to softwood dissolving cellulose in order to study its bleaching efficiency and its potential in terms ...
  • CARACTERITZACIÓ D' AIGÜES (Examen 1r quadrimestre, 2n parcial) 

    Escalas Cañellas, Antoni; Roncero Vivero, María Blanca (Universitat Politècnica de Catalunya, 2011-01-18)
    Exam
    Restricted access to the UPC academic community
  • Cellulose oxidation by Laccase-TEMPO treatments 

    Quintana, Elisabet; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Valls Vidal, Cristina (2017-02-10)
    Article
    Open Access
    In this work, laccase-TEMPO (Lac-T) treatments were applied to bleached commercial dissolving pulp in order to introduce carbonyl and carboxyl groups, which were found to improve dry and wet strength-related properties. ...
  • Coating of laccase-activated phenols for the industrially-feasible functionalization of cellulose-based substrates 

    Cusola Aumedes, Oriol; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2014)
    Conference lecture
    Restricted access - publisher's policy
    The present work describes an innovative method for the hydrophobization of cellulosic material by impregnation with an enzymatically obtained functionalization solution (FS). Application of FS to the surface of previously ...