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    Antimicrobial and physical properties of chitosan films incorporated with turmeric extract
    (Elsevier Science Bv, 2017) Kalaycioglu, Zeynep; Torlak, Emrah; Akin-Evingur, Gulsen; Ozen, Ilhan; Erim, F. Bedia
    In this study, the effects of turmeric extract incorporation on the antibacterialand physical properties of the chitosan films were evaluated. Turmeric containing chitosan-based film was produced with casting procedure and cross-linked with sodium sulfate. Mechanical, optical, thermal properties, and water vapor permeability of the films were studied. The addition of turmeric to chitosan film significantly increased the tensile strength of the film and improved the ultraviolet-visible light barrier of the film. Infrared spectroscopy analysis suggested an interaction between the phenolic compounds of the extract and amin group of chitosan. Antimicrobial activity of the chitosan films was studied against Salmonella and Staphylococcus aureus by plate count agar technique and a better antimicrobial activity was observed with turmeric incorporation. Turmeric incorporated chitosan films with enhanced antimicrobial activity and film stiffness can be suggested as a promising application for food packaging. (C) 2017 Elsevier B.V. All rights reserved.
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    Antimicrobial cerium ion-chitosan crosslinked alginate biopolymer films: A novel and potential wound dressing
    (Elsevier Science Bv, 2017) Kaygusuz, Hakan; Torlak, Emrah; Akm-Evingur, Gulsen; Ozen, Ilhan; von Klitzing, Regine; Erim, F. Bedia
    Wound dressings require good antiseptic properties, mechanical strength and, more trustably, natural material ingredients. Antimicrobial properties of cerium ions and chitosan are known and alginate based wound dressings are commercially available. In this study, the advantages of these materials were combined and alginate films were crosslinked with cerium(III) solution and chitosan added cerium(III) solution. Films were characterized by Fourier transform infrared spectroscopy (FTIR), light transmittance, scanning electron microscopy (SEM), swelling expefiments, water vapor transmittance tests, and mechanical stretching tests. The antibacterial and physical properties of the films were compared with those of conventional calcium alginate films. Both cerium ion crosslinked and cerium ion-chitosan crosslinked alginate films gained antibacterial activity against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. Cerium alginate-chitosan films showed high resistance to being deformed elastically. Results show that cerium alginate-chitosan films can be flexible, ultraviolet protecting, and antibacterial wound dressings. (C) 2017 Elsevier B.V. All rights reserved.