Ara es mostren els items 68-87 de 90

    • Obtaining biobleached eucalyptus cellulose fibres by using various enzyme combinations 

      Valls Vidal, Cristina; Cadena Chamorro, Edith Marleny; Roncero Vivero, María Blanca (2013)
      Article
      Accés restringit per política de l'editorial
      Various combinations of laccases, xylanase and cellulase were used to biobleach cellulose fibres from eucalyptus. The Trametes villosa and Myceliophthora thermophila laccases were used in combination with violuric acid ...
    • Obtaining low-HexA-content cellulose from eucalypt fibres: which glycosil hydrolase family is more efficient? 

      Valls Vidal, Cristina; Vidal Lluciá, Teresa; Gallardo Román, Óscar; Díaz, Pilar; Pastor Blasco, Francisco I. Javier; Roncero Vivero, María Blanca (2010-03-25)
      Article
      Accés restringit per política de l'editorial
      Four new bacterial xylanases from different glycosyl hydrolase families (11, 10 and 5) were evaluated for hexenuronic acid (HexA) removal capacity and bleach boosting ability of a eucalypt kraft pulp. The family 11 xylanase ...
    • Obtention of fibers with high cellulose content by means of enzymatic and chemical treatments 

      Quintana, Elisabet; Valls Vidal, Cristina; Roncero Vivero, María Blanca (OmniaScience, 2021-02-01)
      Comunicació de congrés
      Accés obert
      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 ...
    • Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers 

      Beltramino Heffes, Facundo; Roncero Vivero, María Blanca; Torres López, Antonio Luis; Vidal Lluciá, Teresa; Valls Vidal, Cristina (2016-03-22)
      Article
      Accés obert
      NCC preparation using sulfuric acid hydrolysis from cellulase pretreated fibers was optimized in order to obtain the highest possible yield with 62% and 65% wt. sulfuric acid throughout two statistical plans. At optimal ...
    • Ozone: a promising agent to functionalize cellulose 

      Valls Vidal, Cristina; Cusola Aumedes, Oriol; Roncero Vivero, María Blanca (Ca' Foscari University of Venice, 2023)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Ozone is a well-known chemical agent used in pulp bleaching, where its role is to remove lignin although carbohydrates are also affected. Toe objective ofthis work was to modify cellulose with ozone in order to create new ...
    • Paper functionalization by means of enzymatic surface treatments using hydrophobic compounds and lignosulfonates 

      Cusola Aumedes, Oriol; García Ubasart, Jordi; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In the present work an innovative method for achieving enzymatic surface functionalization on finished paper sheets is presented. A commercial filter paper was surface sized with laccase derived from Trametes Villosa, ...
    • Performance of new and commercial xylanases for ECF and TCF bleaching of eucalyptus kraft pulp 

      Valls Vidal, Cristina; Gallardo Román, Óscar; Vidal Lluciá, Teresa; Pastor Blasco, Francisco I. Javier; Díaz Lucea, Pilar; Roncero Vivero, María Blanca (2011-08)
      Article
      Accés restringit per política de l'editorial
      Since xylanases can differ widely in their bleaching efficiency, the performance of one new and two commercial xylanases was evaluated in an eucalyptus kraft pulp following XD (X: xylanase; D: chlorine dioxide) and XP (P: ...
    • Polynomial and neural fuzzy models for the bleaching of soda pulp from oil-palm empty fruit bunches by hydrogen peroxide 

      Ferrer, Ana; Rosal, Antonio; Valls Vidal, Cristina; Roncero Vivero, María Blanca; Rodríguez, Alejandro (2011)
      Article
      Accés obert
    • Potencial de la celulosa en la construcción de nuevos materiales 

      Vidal Lluciá, Teresa; Torres López, Antonio Luis; Valls Vidal, Cristina; Cusola Aumedes, Oriol; López Martínez, Joan Antoni; Fernández Santos, Julia; Clemente Escuin, Antonio; Roncero Vivero, María Blanca (OmniaScience, 2019-01-31)
      Text en actes de congrés
      Accés obert
      Actualmente, más de una tercera parte de los tipos de papeles que hoy empleamos son para nuevos usos que hace diez años no existían. Además, la demanda creciente de productos basados en materias primas renovables y la ...
    • Potencial de la celulosa en la construcción de nuevos materiales 

      Vidal Lluciá, Teresa; Torres López, Antonio Luis; Valls Vidal, Cristina; Cusola Aumedes, Oriol; López Martínez, Joan Antoni; Fernández Santos, Julia; Clemente Escuin, Antonio; Roncero Vivero, María Blanca; Casals Terré, Jasmina; Farré Lladós, Josep (2019)
      Text en actes de congrés
      Accés obert
      Actualmente, más de una tercera parte de los tipos de papeles que hoy empleamos son para nuevos usos que hace diez años no existían. Además, la demanda creciente de productos basados en materias primas renovables y la ...
    • Promising nanocomposites for food packaging based on cellulose-PCL films reinforced by using ZnO nanoparticles in an ionic liquid 

      Amini, Elahe; Valls Vidal, Cristina; Roncero Vivero, María Blanca (Elsevier, 2023-03)
      Article
      Accés obert
      The fact that most composites consist of polluting synthetic materials has prompted a search for biodegradable replacements based on cellulose fibers and polycaprolactone as potential packaging materials. In this work, we ...
    • Rapid functionalisation of cellulose-based materials using a mixture containing laccase activated lauryl gallate and sulfonated lignin 

      Cusola Aumedes, Oriol; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2014-01-11)
      Article
      Accés restringit per política de l'editorial
      An innovative method has been developed for the surface hydrophobisation of cellulose-based materials by coating it with a functionalised solution (FS), in which sonicated lauryl gallate (LG, dodecyl 3,4,5,-trihydroxybenzoate), ...
    • Recerca i tecnologia en enginyeria gràfica i disseny a la Universitat Politècnica de Catalunya 

      García Carrillo, Àgueda; Ramos Cabal, Alba; Datas Medina, Alejandro; Sureda Carbonell, Bàrbara; Faura López de Haro, Bernat; del Cañizo Nadal, Carlos; Valls Vidal, Cristina; Hernández Díaz, David; Mestres Domenech, Francesc; Bermúdez Rodríguez, Francisco; Hernández Abad, Francisco; Peña Andrés, Javier; Ivern Cacho, Jordi; Lapaz Castillo, José Luís; Ibáñez García, José María; Roncero Vivero, María Blanca; López Membrilla, Manuel; Alcaraz Sendra, Olga; Cusola Aumedes, Oriol; Rojas, Orlando J.; Farrerons Vidal, Óscar; Villar Ribera, Ricardo Alberto; Baltà Salvador, Rosó; Castro de Losada, Rubén de; Hernández Abad, Vicente (OmniaScience, 2020-03-02)
      Llibre
      Accés obert
      Els temps canvien cada vegada més ràpidament, i a la universitat això encara es nota més. L’històric departament d‘Expressió Gràfica a l’Enginyeria (EGE) de la Universitat Politècnica de Catalunya, garant d’una docència ...
    • Removal of lignin and hexenuronic acids from sisal fibers with novel xylanases belonging to different GH families 

      Valenzuela, Susana V.; Valls Vidal, Cristina; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Diaz, Pilar; Pastor Blasco, Francisco Ignacio Javier (2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The aim of this study was to evaluate five different preparations of xylanases from Paenibacillus barcinonensis, a highly xylanolytic species, who is able to grow on xylan as a sole carbon source. As raw material to assess, ...
    • Revalorització dels fangs de la indústria paperera per produir films per l’embalatge 

      Quintana, Elisabet; Valls Vidal, Cristina; Roncero Vivero, María Blanca (OmniaScience, 2023-03)
      Comunicació de congrés
      Accés obert
      El 2020 la producció mundial de paper va ser de més de 400 milions de tones (FAO 2022), i es van generar entre 40 i 50 kg de fang sec per tona de paper produït. La composició dels fangs depèn de les matèries primeres ...
    • Simulation of bleaching of soda pulp from Hesperaloe funifera by polynomial and neural fuzzy models 

      Rosal, Antonio; Valls Vidal, Cristina; Roncero Vivero, María Blanca; Rodríguez Pascual, Alejandro (2012)
      Article
      Accés obert
      Influence of variables [soda, (0.5 to 3.0%), hydrogen peroxide (1.0 to 10.0%) and time (1 to 5 h)] in the bleaching of soda pulp of Hesperaloe funifera, on the properties of bleached pulps, was studied. Polynomial and ...
    • 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
      Accés obert
      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 ...
    • The role of xylanases and laccases on hexenuronic acid and lignin removal 

      Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2010-03)
      Article
      Accés restringit per política de l'editorial
    • Using both xylanase and laccase enzymes for pulp bleaching. 

      Valls Vidal, Cristina; Roncero Vivero, María Blanca (2009)
      Article
      Accés restringit per política de l'editorial
      Two enzyme treatments involving xylanase (X) and laccase (L) were used jointly in an XLE sequence (where E denotes alkaline extraction) to bleach oxygen-delignified eucalyptus kraft pulp in the presence of 1-hydroxybenzotriazol ...
    • Using electrochemical methods to study the kinetics of laccase-catalyzed oxidation of phenols 

      Cusola Aumedes, Oriol; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2018-02-01)
      Article
      Accés obert
      In the present work, the laccase kinetics upon the oxidation process of phenolic compounds was studied using cyclic voltammetry (CV). Several hydroxybenzoic and cinnamic acid compounds were analyzed, and the oxidation ...