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  • 1.
    Cano, María Emilia
    et al.
    Université de Picardie Jules Verne, France; Universidad de Buenos Aires, Argentina.
    Lindgren, Åsa
    RISE Research Institutes of Sweden, Material och produktion, Metodik för produktframtagning.
    Rosendahl, Jennifer
    RISE Research Institutes of Sweden, Material och produktion, Metodik för produktframtagning.
    Johansson, Jenny
    RISE Research Institutes of Sweden, Samhällsbyggnad, Certifiering.
    Garcia-Martin, Alberto
    Universidad Complutense de Madrid, Spain.
    Galan, Miguel Ladero
    Universidad Complutense de Madrid, Spain.
    Kovensky, José
    Université de Picardie Jules Verne, France.
    Chinga Carrasco, Gary
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Characterization of carboxylated cellulose nanofibrils and oligosaccharides from Kraft pulp fibers and their potential elicitor effect on the gene expression of Capsicum annuum2024Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 267, artikel-id 131229Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Biomass-derived oligo- and polysaccharides may act as elicitors, i.e., bioactive molecules that trigger plant immune responses. This is particularly important to increase the resistance of plants to abiotic and biotic stresses. In this study, cellulose nanofibrils (CNF) gels were obtained by TEMPO-mediated oxidation of unbleached and bleached kraft pulps. The molecular structures were characterized with ESI and MALDI MS. Analysis of the fine sequences was achieved by MS and MS/MS of the water-soluble oligosaccharides obtained by acid hydrolysis of the CNF gels. The analysis revealed the presence of two families: one corresponding to homoglucuronic acid sequences and the other composed by alternating glucose and glucuronic acid units. The CNF gels, alone or with the addition of the water-soluble oligosaccharides, were tested on Chili pepper (Capsicum annuum). Based on the characterization of the gene expression with Next Generation Sequencing (NGS) of the C. annuum’s total messenger RNA, the differences in growth of the C. annuum seeds correlated well with the downregulation of the pathways regulating photosynthesis. A downregulation of the response to abiotic factors was detected, suggesting that these gels would improve the resistance of the C. annuum plants to abiotic stress due to, e.g., water deprivation and cold temperatures. 

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  • 2. Cho, S.-W.
    et al.
    Gällstedt, M.
    RISE., Innventia.
    Johansson, E.
    Hedenqvist, M.S.
    Injection-molded nanocomposites and materials based on wheat gluten2011Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, nr 1, s. 146-152Artikel i tidskrift (Refereegranskat)
  • 3.
    Ehman, N. V.
    et al.
    Universidad Nacional de Misiones, Argentina.
    Lourenço, A. F.
    University of Coimbra, Portugal.
    McDonagh, B. H.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Vallejos, M. E.
    Universidad Nacional de Misiones, Argentina.
    Felissia, F. E.
    Universidad Nacional de Misiones, Argentina.
    Ferreira, P. J. T.
    University of Coimbra, Portugal.
    Chinga-Carrasco, Gary
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Area, M. C.
    Universidad Nacional de Misiones, Argentina.
    Influence of initial chemical composition and characteristics of pulps on the production and properties of lignocellulosic nanofibers2020Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 143, s. 453-461Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work aimed to study the influence of the initial chemical composition (glucans, lignin, xylan, and mannans), intrinsic viscosity, and carboxylate groups of pulps on the production process and final properties of lignocellulosic nanofibers (LCNF). Pulps of pine sawdust, eucalyptus sawdust, and sugarcane bagasse subjected to conventional pulping and highly oxidized processes were the starting materials. The LCNF were obtained by TEMPO mediated oxidation and mechanical fibrillation with a colloidal grinder. The nanofibrillation degree, chemical charge content, rheology, laser profilometry, cristallinity and atomic force microscopy were used to characterize the LCNF. The carboxylate groups, hemicelluloses and lignin of the initial pulps were important factors that affected the production process of LCNF. The results revealed that intrinsic viscosity and carboxylate groups of the initial pulps affected LCNF production process, whereas lignin and hemicelluloses influenced the viscosity of LCNF aqueous suspensions, the roughness of LCNF films, and the carboxylate groups content of LCNF

  • 4.
    El Miri, N.
    et al.
    Mid Sweden University, Sweden.
    Heggset, Ellinor B
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Wallsten, Sara
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Massa, papper och förpackningar.
    Svedberg, Anna
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Massa, papper och förpackningar.
    Syverud, Kristin
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Norgren, Magnus
    Mid Sweden University, Sweden.
    A comprehensive investigation on modified cellulose nanocrystals and their films properties2022Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 219, s. 998-1008Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this work, we aimed to tune cellulose nanocrystals (CNCs) properties by introducing different functional groups (aldehyde, carboxyl, silane, and ammonium groups) on the surface through different chemical modifications. These functional groups were obtained by combining: the periodate oxidation with TEMPO-oxidation, aminosylation or cationization. CNCs produced and their films were characterized to elucidate their performances. The results showed that the properties of obtained CNCs varied depending on the grafted functionalities on the surface. The results reveal that after each modification a colloidal stability is preserved. Interestingly, Periodate oxidation of cellulose nanocrystals results in film components that interact through intra- and intermolecular hemiacetals and lead to films with a tensile strength of 116 MPa compared to the pristine CNCs, in contrast the subsequent modifications led to lower tensile strength. Of note, remarkable thermal stability has been achieved after modifications reaching a maximum of 280 °C. The oxygen barrier properties of the films after modifications varied between 0.48 and 0.54 cm3μm/(m2d*kPa) at 50 % RH. 

  • 5.
    Espinosa, Eduardo
    et al.
    University of Córdoba, Spain.
    Bascón-Villegas, Isabel
    University of Córdoba, Spain.
    Rosal, Antonio
    University Pablo de Olavide, Spain.
    Pérez-Rodríguez, Fernando
    University of Córdoba, Spain.
    Chinga-Carrasco, Gary
    RISE - Research Institutes of Sweden, Bioekonomi, PFI.
    Rodríguez, Alejandro
    University of Córdoba, Spain.
    PVA/(ligno)nanocellulose biocomposite films. Effect of residual lignin content on structural, mechanical, barrier and antioxidant properties2019Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 141, s. 197-206Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nanocelluloses with and without residual lignin were isolated from wheat straw. In addition, the effect of TEMPO-mediated oxidation on the production of lignin-containing nanocellulose was studied. The different nanocelluloses were used as reinforcing agent in Poly(vinyl alcohol) films. The morphology, crystallinity, surface microstructure, barrier properties, light transmittance, mechanical and antioxidant properties were evaluated. The translucency of films was reduced by the addition of nanocellulose, however, the ability to block UV-light increased from 10% for PVA to >50% using lignin-containing nanocellulose, and 30% for lignin-free samples. The mechanical properties increased considerably, however, for loads higher than 5% a negative trend was observed presumptively due to a clustering of nanocellulose components in PVA matrix. The barrier properties of the films were improved with the use of nanocellulose, especially at small amounts (1–3%). The antioxidant capacity of films was increased up to 10% using lignin-containing nanocellulose compared to 4.7% using PVA. © 2019 Elsevier B.V.

  • 6.
    Ferreira, Ana R. V.
    et al.
    NOVA University Lisbon, Portugal.
    Haapanen, Janne
    Tampere University of Technology, Finland.
    Mäkelä, Jyrki M.
    Tampere University of Technology, Finland.
    Bratvold, Jon E.
    University of Oslo, Norway.
    Nilsen, Ola
    University of Oslo, Norway.
    Tuominen, Mikko
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Alves, Vitor D.
    University of Lisbon, Portugal.
    Coelhoso, Isabel M.
    NOVA University Lisbon, Portugal.
    Comparison of different coating techniques on the properties of FucoPol films2017Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 103, s. 268-274Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Plasma deposition, liquid flame spray (LFS) and atomic layer deposition (ALD) were used to form inorganic coatings in new exopolysaccharide (FucoPol) biodegradable films. Coated films were characterised in terms of surface, optical and barrier properties in order to evaluate their potential use in food packaging. FucoPol films presented dense and homogeneous surface with instant water contact angle of 95̊. Plasma deposition of perfluorohexane (PFH) on FucoPol surface has not shown significant improvement in the hydrophobic behaviour over the time. The FucoPol coating of SiO2 nanoparticles deposited by LFS and plasma deposition of PFH have shown higher instant water contact angle (135°) caused by coating surface roughness, but this hydrophobic behaviour was not stable over time. FucoPol films coated only with TiO2 deposited by ALD and combination of that with plasma deposition of PFH have shown stable water contact angle during time (90̊ and 115̊, respectively), transparency in the same order of magnitude and significantly lower permeability to water vapour (3.45 × 10−11 mol/m s Pa and 3.45 × 10−11 mol/m s Pa when compared to uncoated films with 5.32 × 10−11 mol/m s Pa). Moreover, films coated with TiO2-PFH have also shown a permeability to oxygen of 1.70 × 10−16 molm/m2s Pa which is 67% lower than uncoated films.

  • 7.
    Karim, Zohab
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi.
    Svedberg, Anna
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi.
    Ayub, Shahanaz
    Bundelkhand Institute of Engineering and Technology, India.
    Role of functional groups in the production of self-assembled microfibrillated cellulose hybrid frameworks and influence on separation mechanisms of dye from aqueous medium2020Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 155, s. 1541-1552Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this article, the role of surface ζ-potential, surface charge density of functional groups and available surface functional groups (-OH and –COO−) of microfibrillated cellulose (MFC) was explored in the production of self-assembled dimensional frameworks. Furthermore, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) oxidation of MFC and in situ TEMPO functionalization of produced frameworks were performed. The effect of increased charge density of carboxylic groups (-COO−) and decrease in surface ζ-potential on binding of titanium dioxide (TiO2) and horseradish peroxidase (HRP) was investigated further. High binding of TiO2 and HRP was reported due to high density of carboxylic group (-COO-) on produced functional frameworks. Thereafter, a model water of Irgalite Violet NZ dye was targeted to understand the behavior of available functional groups and introduced surface ζ-potential of frameworks towards adsorption of dye. Possible size-exclusion of dye aggregates was also explored using neat-MFC frameworks. Photo-oxidation (TiO2) and enzymatic catalysis (HRP) were studied further and highly effective system towards dye degradation was reported. Lastly, this study has shown a well deliberated quantitative understanding of functional groups/their density responsible for the production of frameworks and separation of dye.

  • 8.
    Kian, L. K.
    et al.
    Universiti Putra Malaysia, Malaysia.
    Jawaid, M.
    Universiti Putra Malaysia, Malaysia.
    Ariffin, H.
    Universiti Putra Malaysia, Malaysia.
    Karim, Zoheb
    RISE - Research Institutes of Sweden (2017-2019).
    Isolation and characterization of nanocrystalline cellulose from roselle-derived microcrystalline cellulose2018Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 114, s. 54-63Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Roselle fiber is a renewable and sustainable agricultural waste enriched with cellulose polysaccharides. The isolation of Nanocrystalline cellulose (NCC) from roselle-derived microcrystalline cellulose (MCC) is an alternative approach to recover the agricultural roselle plant residue. In the present study, acid hydrolysis with different reaction time was carried out to degrade the roselle-derived MCC to form NCC. The characterizations of isolated NCC were conducted through Fourier Transform Infrared Ray (FTIR), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM), Dynamic Light Scattering (DLS), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). As evaluated from the performed morphological investigations, the needle-like shape NCC nanostructures were observed under TEM and AFM microscopy studies, while irregular rod-like shape of NCC was observed under FESEM analysis. With 60 min hydrolysis time, XRD analysis demonstrated the highest NCC crystallinity degree with 79.5%. In thermal analysis by TGA and DSC, the shorter hydrolysis time tended to produce NCC with higher thermal stability. Thus, the isolated NCC from roselle-derived MCC has high potential to be used in application of pharmaceutical and biomedical fields for nanocomposite fabrication. 

  • 9. Koch, K.
    et al.
    Gillgren, Thomas
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Stading, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Andersson, R.
    Mechanical and structural properties of solution-cast high-amylose maize starch films2010Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 46, nr 1, s. 13-19Artikel i tidskrift (Refereegranskat)
  • 10.
    Kostag, Marc
    et al.
    University of São Paulo, Brazil.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Material och produktion, Kemi, biomaterial och textil.
    El Seoud, Omar
    University of São Paulo, Brazil.
    Engineering of sustainable biomaterial composites from cellulose and silk fibroin: Fundamentals and applications2021Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 167, s. 687-718Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This review addresses composites prepared from cellulose (Cel) and silk fibroin (SF) to generate multifunctional, biocompatible, biodegradable materials such as fibers, films and scaffolds for tissue engineering. First, we discuss briefly the molecular structures of Cel and SF. Their structural features explain why certain solvents, e.g., ionic liquids, inorganic electrolyte solutions dissolve both biopolymers. We discuss the mechanisms of Cel dissolution because in many cases they also apply to (much less studied) SF dissolution. Subsequently, we discuss the fabrication and characterization of Cel/SF composite biomaterials. We show how the composition of these materials beneficially affects their mechanical properties, compared to those of the precursor biopolymers. We also show that Cel/SF materials are excellent and versatile candidates for biomedical applications because of the inherent biocompatibility of their components.

  • 11.
    Liu, Jiliang
    et al.
    ESRF European Synchrotron Radiation Facility, France.
    Bengtsson, Jenny
    RISE Research Institutes of Sweden, Material och produktion, Polymera material och kompositer.
    Yu, Shun
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Burghammer, Manfred
    ESRF European Synchrotron Radiation Facility, France.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Material och produktion, Polymera material och kompositer.
    Variation in the hierarchical structure of lignin-blended cellulose precursor fibers2023Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 225, s. 1555-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Regenerated cellulose fibers have been considered as potential precursor fibers for carbon fibers because of their balanced cost and performance. Increased attention has been paid to blending lignin with the regenerated cellulose to generate precursor fibers which render good mechanical properties and higher carbon yield. The mechanical properties of carbon fibers have been found closely correlated to the structure of precursor fibers. However, the effects of lignin blending on molecular- and morphological structure of the precursor are still unclear. This study aims at clarifying the structural information of lignin–cellulose precursor fibers from molecular level to mesoscale by scanning X-ray microdiffraction. We present the existence of a skin–core morphology for all the precursor fibers. Increase of lignin content in precursor fiber could reduce the portion of skin and cause obvious disorder of the meso- and molecular structure. By correlating structural variations with lignin blending, 30% lignin blending has been found as a potential balance point to obtain precursor fibers maintaining structural order together with high yield rate. 

  • 12.
    Liu, Zhe
    et al.
    Shaanxi Normal University, China.
    Lin, Dehui
    Shaanxi Normal University, China.
    Lopez-Sanchez, Patricia
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Jordbruk och livsmedel.
    Yang, Xingbin
    Shaanxi Normal University, China.
    Characterizations of bacterial cellulose nanofibers reinforced edible films based on konjac glucomannan2019Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 145, s. 634-645, artikel-id S0141-8130(19)35537-0Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study was aimed at developing edible films of konjac glucomannan (KGM) with different contents of bacterial cellulose nanofibers (BCNs). The effects of different contents of BCNs (0-4% (w/w)) on the properties of KGM-based edible films were investigated in the present work. The rheological properties showed that the film-forming solutions displayed an entanglement system with G'<G″ at low frequency and gel-like behavior with G'>G″ at high frequencies. SEM indicated that BCNs were well dispersed in the BCNs/KGM films. With the increase of BCNs contents, the surface morphology of the films assessed by AFM displayed an increased trend in the surface roughness. Moreover, the films were formed mainly through hydrogen bonds as indicated by FTIR analysis. XRD, DSC and TGA showed that the crystallinity and the thermal stability of films increased with the increase of BCNs. Meanwhile, barrier properties of films were improved by the addition of BCNs. Additionally, with the increase of BCNs, the tensile strength (TS) of the films increased, while the elongation at break (EAB) was increased and then decreased. Therefore, reinforcement of KGM-based films with BCNs leads to enhance barrier and mechanical properties with promising potential as packaging films for food products.

  • 13.
    Popescu, Carmen-Mihaela
    et al.
    Romanian Academy, Romania; Edinburgh Napier University, UK.
    Jones, Dennis
    DJ Timber Consultancy plc, UK; University of Luleå, Sweden.
    Schalnat, Joanna
    University of Ghent, Belgium.
    Segerholm, Kristoffer
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Biobaserade material.
    Henriksson, Marielle
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Biobaserade material.
    Westin, Mats
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Biobaserade material.
    Structural characterization and mechanical properties of wet-processed fibreboard based on chemo-thermomechanical pulp, furanic resin and cellulose nanocrystals2019Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 145, s. 586-593Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fibreboards are made of lignocellulosic fibres and synthetic adhesive which connect them. These synthetic adhesives, while relatively low-cost, are usually non-biodegradable and may cause health and environmental issues. Therefore, in recent years, there has been an increased demand for replacing these adhesives with bio-derived adhesives. The present study aims to develop fibreboards from chemo-thermomechanical pulp and a furanic resin based on prepolymers of furfuryl alcohol via wet-processing. To improve the bonding properties, maleic acid, aluminium sulphate, and cellulose nanocrystals (CNCs) were added. The resulting fibreboards were evaluated for their structural features and mechanical properties. The bending strength was improved when CNCs were added into the fibre's suspension, and the morphology indicated a more compact structure. The combination of the CTMP with CNC and Biorez resulted in the same mechanical behaviours as those noted for CTMP alone, the best performance being observed for the boards in which Al2(SO4)3 was added. Infrared spectroscopy and X-ray diffraction also proved the presence of cellulose nanocrystals and resin in the boards by increased specific bands intensity and crystallinity index, respectively.

  • 14.
    Rasheed, Faiza
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Newson, William R.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Plivelic, Tomás S.
    Lund University, Sweden.
    Kuktaite, Ramune
    SLU Swedish University of Agricultural Sciences, Sweden.
    Hedenqvist, Mikael S.
    KTH Royal Institute of Technology, Sweden.
    Gällstedt, Mikael
    RISE., Innventia.
    Johansson, Eva
    SLU Swedish University of Agricultural Sciences, Sweden.
    Macromolecular changes and nano-structural arrangements in gliadin and glutenin films upon chemical modification. Relation to functionality2015Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 79, s. 151-159Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Protein macromolecules adopted for biological and bio-based material functions are known to develop a structured protein network upon chemical modification. In this study, we aimed to evaluate the impact of chemical additives such as, NaOH, NH4OH and salicylic acid (SA), on the secondary and nano-structural transitions of wheat proteins. Further, the effect of chemically induced modifications in protein macromolecular structure was anticipated in relation to functional properties. The gliadin-NH4OH-SA film showed a supramolecular protein organization into hexagonal structures with 65Å lattice parameter, and other not previously observed structural entities having a characteristic distance of 50Å. Proteins in gliadin-NH4OH-SA films were highly polymerized, with increased amount of disulfide crosslinks and β-sheets, causing improved strength and stiffness. Glutenin and WG proteins with NH4OH-SA showed extensive aggregation and an increase in β-sheet content together with irreversible crosslinks. Irreversible crosslinks hindered a high order structure formation in glutenins, and this resulted in films with only moderately improved stiffness. Thus, formation of nano-hierarchical structures based on β-sheets and disulfide crosslinks are the major reasons of high strength and stiffness in wheat protein based films.

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