Browsing by Author "Valls Vidal, Cristina"Més informacióMés informació

Now showing items 1-20 of 92

    • 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. ...

    • 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
      Open Access
      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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Bacterial cellulose matrices to develop enzymatically active paper 

      Buruaga Ramiro, Carolina; Valenzuela, Susana V.; Valls Vidal, Cristina; Roncero Vivero, María Blanca; Javier Pastor, F.I.; Diaz Lucea, M. Pilar; Martínez Martínez, Josefina (2020-01-31)
      Article
      Open Access
      This work studies the suitability of bacterial cellulose (BC) matrices to prepare enzymatically active nanocomposites, in a framework of more environmentally friendly methodologies. After BC production and purification, ...

    • Bacterial cellulose-chitosan paper with antimicrobial and antioxidant activities 

      Cabañas Romero, L. Verónica; Valls Vidal, Cristina; Valenzuela, Susana V.; Roncero Vivero, María Blanca; Javier Pastor, F.I.; Diaz Lucea, M. Pilar; Martínez Martínez, Josefina (2020-03-12)
      Article
      Open Access
      The production of paper-based bacterial cellulose-chitosan (BC-Ch) nanocomposites was accomplished following two different approaches. In the first, BC paper sheets were produced and then immersed in an aqueous solution ...

    • 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 ...

    • Breve estado del arte de la celulosa bacteriana y sus aplicaciones 

      Durango Giraldo, Geraldine; Valls Vidal, Cristina; Roncero Vivero, María Blanca (OmniaScience, 2024-01)
      Conference lecture
      Open Access
      La celulosa es un biopolímero, el cual constituye la pared celular de las plantas, junto con la lignina y la hemicelulosa. La celulosa también puede ser producida por microorganismo, tales como bacterias. Esta celulosa, ...

    • Cellulose acetate films from chemo-enzymatic dissolving pulps 

      Quintana, Elisabet; Ago, Mariko; Valls Vidal, Cristina; Fernández Santos, Julia; Roncero Vivero, María Blanca; Rojas, Orlando J. (2022)
      Conference lecture
      Open Access
      The purpose of this work is to obtain dissolving cellulose fibers that are suitable for the manufacturing of cellulose derivatives. Therefore, the combination of enzymatic and chemical treatments during the bleaching stage ...

    • 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. ...