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Search Results (49)
  • Open Access

    ARTICLE

    Encapsulation of Bacterial Metabolic Infiltrates Isolated from Different Bacillus Strains in Chitosan Nanoparticles as Potential Green Chemistry-Based Biocontrol Agents against Radopholus similis

    Hilary Ureña-Saborío1*, Sergio Madrigal-Carballo1, Jorge Sandoval2, José R. Vega-Baudrit3, Alejandro Rodríguez-Morales2

    Journal of Renewable Materials, Vol.5, No.3-4, pp. 290-299, 2017, DOI:10.7569/JRM.2017.634119

    Abstract Currently there is a trend towards reducing the use of agrochemicals in developing countries. However, they are still being applied intensively in tropical countries. Thus, there is a trend towards developing new products based on natural chemicals for pest control, leading to second-generation pesticides incorporating nano- and biotechnologies. Costa Rica is one of the largest producers of bananas in the world. One of the most important pests of banana and plantain crops is the burrowing nematode, Radopholus similis (Cobb) Thorne. Highly toxic chemical compounds have traditionally been used to control this specific pest in banana… More >

  • Open Access

    ARTICLE

    Beetosan-Based Hydrogels Modified with Natural Substances

    Bożena Tyliszczak1, Anna Drabczyk2*, Sonia Kudłacik2, Agnieszka Sobczak-Kupiec2

    Journal of Renewable Materials, Vol.5, No.3-4, pp. 174-179, 2017, DOI:10.7569/JRM.2017.634107

    Abstract In this study a series of hydrogels based on Beetosan® and containing natural substances, such as bee pollen and sage (Salvia officinalis), have been prepared. Beetosan is a type of chitosan that is obtained from the external skeletons of naturally occurring dead honeybees. In multistage chemical treatment, dead insect waste is converted into chitosan that is used in research as a hydrogel matrix. Prepared materials were synthesized using photopolymerization. Studies on the obtained hydrogels included determining their swelling ability and behavior in a simulated body fluid environment, as well as determining their chemical structure by More >

  • Open Access

    ARTICLE

    Effects of Cold Plasma on Surface, Thermal and Antimicrobial Release Properties of Chitosan Film

    S.K. Pankaj1, C. Bueno-Ferrer1, N.N. Misra1, L. O’Neill2, Paula Bourke1, P.J. Cullen3*

    Journal of Renewable Materials, Vol.5, No.1, pp. 14-20, 2017, DOI:10.7569/JRM.2016.634105

    Abstract This work aims to analyze the effects of cold atmospheric air plasma treatment of antimicrobial chitosan film with different levels of thymol. Optical characterization of the dielectric barrier discharge showed the generation of reactive nitrogen and oxygen species by the system. A significant increase (p < 0.05) in the surface roughness was observed after cold plasma treatment of the films. No significant difference (p > 0.05) was observed in the thermal profile of the plasma-treated films. A significant increase (p < 0.05) in the thymol diffusion coefficient was observed after the plasma treatment for all More >

  • Open Access

    ARTICLE

    Photoresponsive Multilayer Films of Chitosan and an Azopolymer

    Raquel Fernández*, Connie Ocando, Susana C. M. Fernandes, Arantxa Eceiza, Agnieszka Tercjak

    Journal of Renewable Materials, Vol.3, No.1, pp. 49-55, 2015, DOI:10.7569/JRM.2014.634134

    Abstract The main goal of this work was the development of photoactive multilayer fi lms. Taking into account that chitosan is a biodegradable, biocompatible, nontoxic, and antibacterial biopolymer, the fabrication of chitosanbased multilayer fi lms can be an interesting pathway to obtain biopolymer-based fi lms in which properties can be combined with a light-responsive material, such as an azobenzene-containing polymer. In particular, the layer-by-layer technique was used for the fabrication of the optically active fi lms consisting of alternating layers of chitosan and an azopolymer. The infl uence of the pH and the number of bilayers More >

  • Open Access

    ARTICLE

    Impact of Biodegradable Chitosan-Based Coating on Barrier Properties of Papers

    Nicolas Bordenave1,2,3,*, Diana Kemmer4, Sonja Smolic4, Roland Franz4, Florence Girard5, Veronique Coma1,2,*

    Journal of Renewable Materials, Vol.2, No.2, pp. 123-133, 2014, DOI:10.7569/JRM.2014.634105

    Abstract Aroma and oxygen-barrier properties of chitosan-coated papers were measured in order to evaluate the potential of these materials as biodegradable materials for food packaging. Firstly, two chitosans (Chi- 244 and Chi-652) were studied according to their ultimate biodegradability. Chi-652 showed the best fi nal biodegradation rate and was then used for subsequent tests in association with papers. Then, oxygen-barrier and aroma-barrier properties of papers, Chi-652 fi lms and Chi-652-coated papers were investigated. The Chi-652 fi lms exhibited oxygen-barrier at low relative humidity and aroma-barrier comparable to synthetic materials already used in the packaged food industry. More >

  • Open Access

    ARTICLE

    Cytotoxicity assessment of a gold nanoparticle-chitosan nanocomposite as an effi cient support for cell immobilization: comparison with chitosan hydrogel and chitosan-gelatin

    Mohammad Reza RAMEZANI1, Hossein NADERI-MANESH1, *, Hossain-Ali RAFIEEPOUR2

    BIOCELL, Vol.38, No.1, pp. 11-16, 2014, DOI:10.32604/biocell.2014.38.011

    Abstract Cell-based biosensors have become a research hotspot in the biosensors and bioelectronics fields. The main feature of cell-based biosensors is immobilization of living cells on the surface of transducers. Different types of polymers which are used as scaffolds for cell growth should be biocompatible and should have reactive functional groups for further attachment of biomolecules. In this work, cell attachment and proliferation on chitosan hydrogel, chitosan-gelatin and gold nanoparticle-chitosan nanocomposite membranes was studied. Characterization of the membranes was performed using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Cytotoxicity assessment on HEK293 More >

  • Open Access

    ARTICLE

    AFM and Nanoindentation Studies of Bone Nodules on Chitosan-Polygalacturonic Acid-Hydroxyapatite Nanocomposites

    R. Khanna1,2, D. R. Katti1, K. S. Katti1

    CMES-Computer Modeling in Engineering & Sciences, Vol.87, No.6, pp. 530-556, 2012, DOI:10.3970/cmes.2012.087.530

    Abstract Here we report a new in situ nanoindentation technique developed to evaluate the composite mechanical behavior of cell-biomaterial construct under physiological conditions over the time scale of bone nodule generation. Using this technique, mechanical behavior of osteoblast cell-substrate interfaces on tissue engineered materials (chitosan-polygalacturonic acid-nanohydroxyapatite (CPH) films) is investigated. Mechanical behavior of cells in the elastic regime over the time scale of cell adhesion (1 day), proliferation (4 days), development (8 days) and maturation (22 days) of bone nodules is evaluated. Our results indicate that the elastic properties of flat cells are higher (indicating stiffer… More >

  • Open Access

    ARTICLE

    The Effect of Processing Temperature on Mechanical Properties of Novel Silk Fibroin and Chitosan Blend Scaffolds for Musculoskeletal Regeneration

    C. N. Rios1, J. N. Augustine1, A. B. Mathur1

    Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 173-174, 2006, DOI:10.32604/mcb.2006.003.173

    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    Chitosan-based Semi-permeable Nerve Conduits Support Periphereal Nerve Regeneration in Goats and Nonhuman Primates

    A-J. Wang1, Q. Ao1, 2, K. Gong1, Z-H. Zheng1, G-Y. Lu1, G. Wang1, Q. He1, L-J. Kong1, Y-D. Gong1, N-M. Zhao1, X-F. Zhang1

    Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 143-144, 2006, DOI:10.32604/mcb.2006.003.143

    Abstract This article has no abstract. More >

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