Now showing items 1-18 of 18

  • 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 ...
  • 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 ...
  • 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 ...
  • 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. ...
  • 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 ...
  • Effect of residual lignin and heteropolysaccharides in nanofibrillar cellulose and nanopaper from wood fibers 

    Ferrer Carrera, Ana; Quintana, Elisabet; Filpponen, Ilari; Solala, Iina; Vidal Lluciá, Teresa; Rodríguez Pascual, Alejandro; Laine, Janne; Rojas, Orlando J. (2012-12)
    Article
    Restricted access - publisher's policy
    Unbleached (UN), oxygen-delignified and fully-bleached (FB) birch fibers with a residual lignin content of ca. 3, 2 and\1 %, respectively, were used to produce nanofibrillated cellulose (NFC) and nanopaper by using an ...
  • Endoglucanase treatments for improving pulp reactivity in biobleached and commercial dissolving pulps 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015)
    Conference lecture
    Restricted access - publisher's policy
    In this study, a bleached commercial dissolving pulp and a TCF sulphite pulp, bleached at the laboratory scale with a laccase–violuric acid system and complemented with a pressurized hydrogen peroxide stage (LVAPO), were ...
  • Enzymatically treated sulphite pulp to give dissolving-pulp characteristics 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2013)
    Conference report
    Restricted access - publisher's policy
    Bleached cellulose with good end-properties (~90% ISO brightness, < 0.5 kappa number and substantially preserved cellulose integrity) was obtained by using a totally chlorine-free (TCF) biobleaching sequence. The initial ...
  • Enzymatic and chemical treatments to obtain pulps with high-cellulose content 

    Quintana, Elisabet (Universitat Politècnica de Catalunya, 2016-09-19)
    Doctoral thesis
    Open Access
    La celulosa es el polímero más abundante en la Tierra y en los últimos años ha ganado un amplio interés como fuente de nuevos productos con requisitos de procesamiento y de calidad diferentes a los procesos convencionales ...
  • Evaluating changes on cellulosic biobleached fibers by means of thermogravimetric analysis 

    Quintana, Elisabet; Garcia Barneto, Agustín; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Ariza, J.; Roncero Vivero, María Blanca (2014)
    Conference lecture
    Restricted access - publisher's policy
    The effects on fibre surface produced by the laccase-mediator system on softwood sulphite fibres were analysed in terms of surface crystallinity using thermogravimetric analysis. The starting pulp presented low content of ...
  • Exploring biobleaching possibilities of dissolving pulps by means of enzymatic treatments 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2014)
    Conference lecture
    Restricted access - publisher's policy
    Unbleached sulphite cellulose was subjected to an LQPo biobleaching sequence with the intention to elucidate the potential of LMS as an alternative to conventional bleaching processes. The enzymatic stage (L) was performed ...
  • Material docent en format digital per a assignatures d'experimentació en química 

    Grau Vilalta, Maria Dolors; Almajano Pablos, María Pilar; Alvarez, M. Dolors; Calafell Monfort, Margarita; Calvet Tarragona, Aureli; Cardona, Anna; Farran Marsà, Adriana; Garrido, Núria; Gorchs Altarriba, Roser; Graells Sobré, Moisès; Guaus Guerrero, Ester; Martínez Martínez, María del Rosario; Morillo Cazorla, Margarita; Pardo Tràfach, Patricia; Salán Ballesteros, Maria Núria; Torras, Núria; Quintana, Elisabet; Erdmann, Rocio; Bover, Laura (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2010-02-11)
    Conference lecture / Conference report
    Open Access
    En aquesta comunicació es presenta un projecte elaborat arran de l’interès mostrat per un grup de professorat en disposar de material audiovisual propi i comú per a assignatures experimentals de química de diferents ...
  • New strategies to bleach dissolving pulps using enzymatic treatments 

    Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2014)
    Conference report
    Open Access
    A biobleaching sequence was applied to sulphite pulp in order to explore new bleaching possibilities using enzymatic treatments. Therefore, the well-known laccase-mediator system was used with the aim to achieve dissolving ...
  • Studying the effects of laccase treatment in a softwood dissolving pulp: cellulose reactivity and crystallinity 

    Quintana, Elisabet; Valls Vidal, Cristina; Garcia Barneto, Agustín; Vidal Lluciá, Teresa; Ariza, J.; Roncero Vivero, María Blanca (2014-11-05)
    Article
    Open Access
    An enzymatic biobleaching sequence (LVAQPO) using a laccase from Trametes villosa in combination with violuric acid (VA) and then followed by a pressurized hydrogen peroxide treatment (PO) was developed and found to give ...