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  • Open Access

    ARTICLE

    Development of Chitosan-based Films Containing Hypericum perforatum L. and Citrus limon L. as Potential Wound Dressing Materials

    DENIZ AKIN SAHBAZ1,*, BETUL TURP KAYA2

    Journal of Polymer Materials, Vol.38, No.3-4, pp. 247-256, 2021, DOI:10.32381/JPM.2021.38.3-4.6

    Abstract The objective of this study is to develop chitosan-based films containing Hypericum perforatum L. and/or Citrus limon L. oils and to investigate their suitability as novel wound dressing materials. The morphology of the chitosan-based films were observed by means of employing the scanning electron microscopy (SEM) and the chemical structure characterization was performed via Fourier Transform Infrared Spectroscopy (FTIR). Hypericum perforatum L. and/or Citrus limon L. were successfully incorporated to the chitosan films. Antibacterial, swelling, and mechanical properties of these films were investigated. The antibacterial property was enhanced by incorporating Hypericum perforatum L. and Citrus More >

  • Open Access

    ARTICLE

    Taguchi Design of the Experimental approach to Increase the Biomass and Cell Wall Chitosan Contents of Zygomycetous Dimorphic Fungus Benjaminiella Poitrasii

    S.R. MANE1,2, E. K. PATHAN3, G. PATIL4, S. G. TUPE5, V. GHORMADE4, B. P. CHAUDHARI1,2, M.V. DESHPANDE5,*

    Journal of Polymer Materials, Vol.38, No.3-4, pp. 219-230, 2021, DOI:10.32381/JPM.2021.38.3-4.4

    Abstract A dimorphic fungus Benjaminiella poitrasii contains high chitin/chitosan (35% of the cell wall) in the mycelial (M) form than its yeast (Y) form (20% of the cell wall). However, the relative proportion of chitosan is more in yeast form cells (chitosan: chitin ratio, 6:1) than mycelial cells (chitosan: chitin ratio, 3:1). Using the Taguchi design of experimental (DOE) approach, interactions among eight different parameters showed that carbon source (starch, 10 g/L), incubation time (48 h), inoculum (M and Y mixed 10%), yeast extract (6 g/L) and peptone (10 g/L), were optimum for maximum biomass production.… More >

  • Open Access

    ARTICLE

    Healing Effect and Underlying Mechanism of Silver Nanoparticles Prepared Using Carboxymethyl Chitosan under Solar Irradiation

    Yi Long1,#,* , Chunling Zhang2,#,*, Lan Chen3,#, Tietao Di2, Lu Chen2, Lisha Tang2, Kaizhong Luo2, Yu Yan1, Pingzhen Tong2, Jie Xiang4

    Journal of Renewable Materials, Vol.9, No.6, pp. 1075-1085, 2021, DOI:10.32604/jrm.2021.014555 - 11 March 2021

    Abstract In our previous study, silver nanoparticles were prepared using AgNO3 and carboxymethyl chitosan (CMCS) which is commercially available with solar irradiation. In this study, the efficacy and safety of silver nanoparticles prepared by this method were evaluated for healing wounds in rats with diabetes. We also attempted to determine the underlying mechanism and influencing factors of the silver nanomaterial preparation method. Compared with growth factors, silver nanoparticles exhibit better healing effects for rats with diabetes. No remnant silver ions were detected in the major organs of these rats after the application of silver nanoparticles. Silver nanoparticles… More >

  • Open Access

    ARTICLE

    Plasticized Polyethylene/Chitosan Blend Films and Study of the Effect of Plasticizers on their various Properties and Biodegradabilty

    HULYA SEMA KOKER1, HÜLYA YAVUZ ERSAN1, AYSE AYTAC2,3,*

    Journal of Polymer Materials, Vol.37, No.3-4, pp. 165-177, 2020, DOI:10.32381/JPM.2020.37.3-4.4

    Abstract Chitosan (CH) and low-density polyethylene (PE) blend films were produced by a twin-screw extruder and heat press with different plasticizers glycerol (GLY), sorbitol (SOR) and polyethylene glycol (PEG). The tensile strength decreased and elongation at break increased with the incorporation of plasticizer for blends with 10 wt% of CH. The thermal stability of the films was slightly higher for films containing GLY and PEG as compared to SOR. Contact angles reduced from CH-PE film to the films containing PEG, SOR and GLY in decreasing order, respectively. Fourier transform infrared spectroscopy revealed no interactions between CH More >

  • Open Access

    ARTICLE

    Chitosan and Carboxymethylchitosan as High Turbidity Water Biocoagulants

    Raimundo N. Lima Júnior1, João L. I. O. Almeida1, Jones de Andrade2, Flávia O. M. S. Abreu1,*

    Journal of Renewable Materials, Vol.8, No.11, pp. 1489-1504, 2020, DOI:10.32604/jrm.2020.011629 - 28 September 2020

    Abstract Biocoagulants emerges as a promising technology in water treatment, in order to exploit renewable and biodegradable materials. The present work aims to study the coagulant action of chitosan and carboxymethylchitosan on water with very high turbidity (above 300 NTU), contrasting the physicochemical results with those obtained for aluminum sulphate. Carboxymethylchitosan was produced by the Williamson’s ethers synthesis and characterized by potentiometric titration, FTIR and 1 H-NMR. The coagulant tests were performed using synthetic water in a Jar-test equipment, through the induction of high and low velocity gradients, followed by sedimentation. The results showed turbidity and color More >

  • Open Access

    ARTICLE

    Improving the Antibacterial Property of Chitosan Hydrogel Wound Dressing with Licorice Polysaccharide

    Haiwei Ren1, Li Wang1, Hui Bao1, Yunya Xia1, Dada Xu1, Weijie Zhang1,*, Zhiye Wang2

    Journal of Renewable Materials, Vol.8, No.10, pp. 1343-1355, 2020, DOI:10.32604/jrm.2020.010903 - 31 August 2020

    Abstract A series of hydrogels with different ratios of chitosan and licorice polysaccharide (LP) were prepared by crosslinking to different concentrations of genipin (gp). They were characterized by FTIR (Fourier transform infrared spectroscopy), SEM (Scanning electron microscope), swelling ratio, rheological measurements, degradation with time, cytotoxicity, and antibacterial efficacy. Results show that the hydrogels have porous structures. With an increase in LP content, the swelling rate grows in the early stage of immersion in buffer and drops later. The swelling ratio ranged from 986% to 1677%, and stiffness varied from 777 Pa to 1792 Pa. The addition… More >

  • Open Access

    ARTICLE

    Two Routes to Produce Chitosan from Agaricus bisporus

    Abdelghani Hassainia1, Hamid Satha1,*, Boufi Sami2

    Journal of Renewable Materials, Vol.8, No.1, pp. 101-111, 2020, DOI:10.32604/jrm.2020.07725 - 01 January 2020

    Abstract Two methods were used to produce chitosan by deacetylation of chitin which was extracted from Agaricus bisporus stipes. The first one gives chitosan 1 with low yield of 2.5%, degree of acetylation (DA) of 4%, molecular weight (MW) of 2.973 × 105 (g/mol). The second route produces chitosan 2 with higher yield of 41%, degree of acetylation (DA) of 17.23%, molecular weight (MW) of 2.939 × 105 (g/mol). Both chitosans were characterized by XRD, FTIR, 1 H-NMR spectroscopy nuclear magnetic resonance of proton. The molecular weight (MW) was determined by size exclusion chromatography (SEC). Thermal analysis shows that More >

  • Open Access

    ARTICLE

    Mechanical and Biological Properties of Chitosan Nanocomposite Films: Effects of POSS nanoparticles

    R. VENKATESAN*, S. R. DARSON IMMANUEL JOHN, N. RAJESWARI

    Journal of Polymer Materials, Vol.36, No.3, pp. 261-273, 2019, DOI:10.32381/JPM.2019.36.03.6

    Abstract Nanocomposite films of chitosan (CH) incorporated with different wt. % of the polyoligomericsilsesquioxane (POSS) were prepared by solution casting. The thermal, mechanical, morphological and antimicrobial properties of the nanocomposites were examined. TGA analyses of the nanocomposites indicate that the filler enables the enhancement of thermal stability of chitosan. The tensile strength of the nanocomposite films is enhanced (10.9 MPa for neat chitosan to 24.0MPa for 5wt. % filled chitosan) by the addition of POSS while the elongation at break is reduced. The nanocomposite films exhibited excellent antimicrobial activity against both gram positive and gram negative More >

  • Open Access

    ARTICLE

    Chitosan Modification by New Chromophore 4-(3-(4- nitrophenyl) thioureido) benzoic acid: Synthesis, Characterization and Evaluation

    KAZIM SHAMIM RIZVI, P. K. DUTTA

    Journal of Polymer Materials, Vol.36, No.3, pp. 217-228, 2019, DOI:10.32381/JPM.2019.36.03.2

    Abstract In this investigation we have shown the preparation of carboxylic acid containing new chromophore : 4-(3-(4-nitrophenyl) thioureido) benzoic acid and its use.The chemical modification of chitosan, e.g., chitosan- acid salt complexes is done under mild conditions. The synthesis of chromophore was carried out by conventional methods and the novel polymer complex was soluble in most of the organic solvents. The modified chitosan was analyzed by various techniques like optical properties by UV and SHG spectroscopy which showed red shift. The antibacterial activity showed obvious effect against food pathogenic bacteria. More >

  • Open Access

    ARTICLE

    Synthesis and Characterization of New Chromophore 4-2-(2-hydroxy-5-(4 nitrophenyl) diazenyl) benzylidene) hydrazinyl) Benzoic Acid and its use in Chitosan Modification

    KAZIM SHAMIM RIZVI, P.K.DUTTA*

    Journal of Polymer Materials, Vol.36, No.1, pp. 75-85, 2019, DOI:10.32381/JPM.2019.36.01.6

    Abstract The present investigation deals with the preparation of carboxylic acid containing new chromophore : 4-2-(2-hydroxy-5-(4-nitrophenyl) diazenyl) benzylidene) hydrazinyl) benzoic acid and its use for chemical modification of chitosan, e.g., chitosan-acid salt complexes under mild conditions. Optical properties of chitosan acid complexes were evaluated by UV and SHG spectroscopy which showed red shift. Antibacterial activity of prepared chitosan acid complexes showed obvious effect against food pathogenic bacteria. The novel polymer complex was soluble in most of the organic solvents. More >

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