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Sökning: WFRF:(Engstrand Lars) > Lantbruksvetenskap

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1.
  • Alimohammadzadeh, Rana, et al. (författare)
  • Improving the mechanical properties of CTMP fibers by combining synergistic organocatalytic/polyelectrolyte complex surface engineering with sulfite pretreatment
  • 2022
  • Ingår i: Proceedings of the International Mechanical Pulping Conference. ; , s. 149-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Fabrication of paper-based packaging materials is increasing and the challenge is developing a sustainable process to manufacture the materials that can compete with plastics. Employing stronger fiber in production of fiber-based materials improves the efficiency of fabrication process by using a reduced amount of biomass. Cationic starch is a well-known polysaccharide that has been introduced to paper and paperboard fibers to improve the mechanical properties of lignocellulosic fibers. The polyelectrolyte (PE) multilayer method has been popularized as a new and interesting technique to enhance the adsorption of cationic starch on the fiber for improving the strength properties of chemi-thermomechanical pulp (CTMP), chemical and kraft pulps. We have shown in our previous work that the synergistic combination of organocatalysis and PE complexes improved the mechanical properties of CTMP and TMP. In this work, we chose to expand this concept by integrating it with low-dose sulfite pretreatment of wood chips in preparation of CTMP. Thus, CTMP produced by initial sulfite pre-treatment was next surface engineered by synergistic combination of organocatalysis and PE complexes using organic acids as catalysts. The CTMP pulps, which contains 0.1-0.24 wt.% sulfur, produced by our novel pulp-engineering strategy shows a dramatic strength increase (Z- strength: up to 100 %) as compared to no surface engineering. While only sulfite pre-treatment and PE-complex surface engineering were able to improve the strength properties, it was only when the organic catalysts was present that the highest strength improvements were reached. Thus, a clear synergistic effect of the catalyst was observed.
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2.
  • Strid, Åke, 1960-, et al. (författare)
  • HIV, Chlamydia trachomatis and Helicobacter pylori vaccine antigen and proteinaceous adjuvant production in arabidopsis and carrot
  • 2010
  • Ingår i: Molecular farming. - Bryssel : COST. ; , s. 17-17
  • Konferensbidrag (refereegranskat)abstract
    • In our project, we use plants for synthesis of vaccine antigens and adjuvant proteins. Among targeted diseases are HIV, Chlamydia trachomatis (CT) and Helicobacter pylori (HP) infections. Novel genetic constructs have been designed for production of optimized antigen proteins and several transformation techniques and intracellular protein production sites are being examined for yield optimization. Both Arabidopsis thaliana (HIV, CT, HP) and carrot (HIV, CT) have been successfully used as production hosts and plant-produced antigens against HIV (primarily the p24 protein), CT (own designed chimera of the MOMP protein) and HP (different versions of the TonB protein). For HIV and CT these antigens have been used in immunization trials in laboratory mice, giving rise to systemic immune responses. For this purpose both consumption of plant tissue and distribution of purified antigens have been used. For CT, the administration of the recombinant protein has also been shown to protect against the disease in mice. Moreover, to further increase the effect of vaccine antigens, we also use plants to produce protein-based adjuvants for inclusion in vaccine formulations. These adjuvants are based either on the bacterial flagellin protein or are cholera toxin-derived chimeric proteins.
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