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  • 1.
    Fernandes, Susana C. M.
    et al.
    KTH, School of Biotechnology (BIO), Glycoscience. University of the Basque Country, Spain.
    Alonso-Varona, Ana
    Palomares, Teodoro
    Zubillaga, Veronica
    Labidi, Jalel
    Bulone, Vincent
    KTH, School of Biotechnology (BIO), Glycoscience. University of Adelaide, Australia.
    Exploiting Mycosporines as Natural Molecular Sunscreens for the Fabrication of UV-Absorbing Green Materials2015In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 30, p. 16558-16564Article in journal (Refereed)
    Abstract [en]

    Ultraviolet radiations have many detrimental effects in living organisms that challenge the stability and function of cellular structures. UV exposure also alters the properties and durability of materials and affects their lifetime. It is becoming increasingly important to develop new biocompatible and environmentally friendly materials to address these issues. Inspired by the strategy developed by fish, algae, and microorganisms exposed to UV radiations in confined ecosystems, we have constructed novel UV-protective materials that exclusively consist of natural compounds. Chitosan was chosen as the matrix for grafting mycosporines and mycosporine-like amino acids as the functional components of the active materials. Here, we show that these materials are biocompatible, photoresistant, and thermoresistant, and exhibit a highly efficient absorption of both UV-A and UV-B radiations. Thus, they have the potential to provide an efficient protection against both types of UV radiations and overcome several shortfalls of the current UV-protective products. In practice, the same concept can be applied to other biopolymers than chitosan and used to produce multifunctional materials. Therefore, it has a great potential to be exploited in a broad range of applications in living organisms and nonliving systems.

  • 2.
    Fernandes, Susana C. M.
    et al.
    KTH, School of Biotechnology (BIO), Glycoscience.
    Bulone, Vincent
    KTH, School of Biotechnology (BIO), Glycoscience. Univ Adelaide, ARC Ctr Excellence Plant Cell Walls, Urrbrae, SA, Australia.
    UV-absorbing materials based on natural molecular sunscreens and chitosan2017In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 253Article in journal (Other academic)
  • 3. Robles, E.
    et al.
    Salaberria, A. M.
    Herrera, R.
    Fernandes, Susana C. M.
    KTH, School of Biotechnology (BIO), Glycoscience.
    Labidi, J.
    Self-bonded composite films based on cellulose nanofibers and chitin nanocrystals as antifungal materials2016In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 144, p. 41-49Article in journal (Refereed)
    Abstract [en]

    Cellulose nanofibers and chitin nanocrystals, two main components of agricultural and aquacultural by-products, were obtained from blue agave and yellow squat lobster industrial residues. Cellulose nanofibers were obtained using high pressure homogenization, while chitin nanocrystals were obtained by hydrolysis in acid medium. Cellulose nanofibers and chitin nanocrystals were characterized by X-ray diffraction, Atomic Force Microscopy and Infrared spectroscopy. Self-bonded composite films with different composition were fabricated by hot pressing and their properties were evaluated. Antifungal activity of chitin nanocrystals was studied using a Cellometer®cell count device, mechanical properties at tension were measured with a universal testing machine, water vapor permeability was evaluated with a thermohygrometer and surface tension with sessile drop contact angle method. The addition of chitin nanocrystals reduced slightly the mechanical properties of the composite. Presence of chitin nanocrystals influenced the growth of Aspergillus sp fungus in the surface of the composites as expected.

  • 4. Salaberria, Asier M.
    et al.
    Labidi, Jalel
    Fernandes, Susana C. M.
    KTH, School of Biotechnology (BIO), Glycoscience.
    Different routes to turn chitin into stunning nano-objects2015In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 68, p. 503-515Article in journal (Refereed)
    Abstract [en]

    Due to its intractable structure and inherent insoluble nature, chitin was for a long time an underutilized resource. The increasing interest in the use of chitin as a source of nanostructured materials is quite recent. This review provides the latest advances in different ways to isolate or fabricate chitin nano-objects - chitin nanocrystals (CHNC) and chitin nanofibers (CHNF) - from different chitin sources. It also summarizes the chronology of some important scientific advances on chitin research during its 200 years of history. Additionally, engineered composite materials based on chitin nano-objects are reviewed.

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