Now showing items 1-20 of 60

  • 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 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
    Restricted access - publisher's policy
    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 neural fuzzy model applied to hydrogen peroxide bleaching of non-wood soda pulps 

    Rosal, Antonio; Valls Vidal, Cristina; Ferrer, Ana; Rodríguez, Alejandro (2012)
    Article
    Open Access
    A neural fuzzy model was used to examine the influence of pulp bleaching variables of empty fruit bunches from oil palm (EFB) and Hesperaloe funifera, such as soda concentration (0.5-3%), hydrogen peroxide concentration ...
  • A new use for TCF pulp with a high hexenuronic acid content 

    Valls Vidal, Cristina; Roncero Vivero, María Blanca (2013)
    Conference report
    Restricted access - publisher's policy
    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
    Open Access
    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 ...
  • Aplicació de nous sistemes enzimàtics pel blanqueig de pasta kraft d'eucaliptus 

    Valls Vidal, Cristina (Universitat Politècnica de Catalunya, 2008-05-28)
    Doctoral thesis
    Open Access
    La tesi que ens ocupa, parteix de I'interes de blanquejar pasta kraft d'eucaliptus a traves de tecnologies netes, es a dir, utilitzant metodes mes respectuosos pel medi ambient. La motivacio per a la realitzacio d'aquesta ...
  • 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
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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 enzymatic effects of cellulases and LPMO in improving mechanical fibrillation of cotton linters 

    Valls Vidal, Cristina; Pastor Blasco, Francisco Ignacio Javier; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Diaz Lucea, M. Pilar; Martinez Soler, Josefina; Valenzuela, Susana V. (2019-06-26)
    Article
    Open Access
    Background: The increasing interest in replacing petroleum-based products by more sustainable materials in the packaging sector gives relevance to cellulose as a biodegradable natural resource. Moreover, its properties can ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • A straightforward bioprocess for a cleaner paper decolorization 

    Valls Vidal, Cristina; Cusola Aumedes, Oriol; Vidal Lluciá, Teresa; Torres López, Antonio Luis; Roncero Vivero, María Blanca (2019-07-17)
    Article
    Restricted access - publisher's policy
    A new biotechnological sequence for decolorizing red and black colored paper was developed to reduce the environmental impact of the chemicals used in paper recycling processes. Commercially available low-redox potential ...
  • 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
    Open Access
    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 ...
  • 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 ...
  • 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 ...
  • Comparative evaluation of the action of two different endoglucanases. Part II: on a biobleached acid sulphite pulp 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015-04-30)
    Article
    Open Access
    A TCF sulphite pulp, bleached at the laboratory scale with a laccase–violuric acid system and complemented with a pressurized hydrogen peroxide stage, was treated with two endoglucanases, one obtained from Paenibacillus ...
  • Comparative evaluation of the action of two different endoglucanases. Part I: on a fully bleached, commercial acid sulfite dissolving pulp 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015-04-19)
    Article
    Open Access
    A fully bleached commercial acid dissolving pulp was treated with two endoglucanases, one obtained from Paenibacillus barcinonensis (B) and the other one produced from Cerrena unicolor (F) with the intention to improve ...
  • Conferring antioxidant capacity to cellulose based materials by using enzymatically-modified products 

    Cusola Aumedes, Oriol; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015-05-30)
    Article
    Open Access
    A new, industrially feasible method for conferring cellulosic substrates antioxidant properties by using enzymatic products was developed. The method allows cellulose surfaces such as those of paper sheets to be conferred ...