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Article Citation - WoS: 18Citation - Scopus: 19Effects of Nozzle Type Atmospheric Dry Air Plasma on L929 Fibroblast Cells Hybrid Poly (ε-caprolactone)/Chitosan (ε-Caprolactone) Scaffolds Interactions(Soc Bioscience Bioengineering Japan, 2016) Ozkan, Ozan; Sasmazel, Hilal TurkogluIn the study presented here, in order to improve the surface functionality and topography of poly (epsilon-caprolactone) (PCL)/chitosan/PCL hybrid tissue scaffolds fabricated layer by layer with electrospinning technique, an atmospheric pressure nozzle type plasma surface modification was utilized. The optimization of the plasma process parameters was carried out by monitoring the changes in surface hydrophilicity by using contact angle measurements. SEM, AFM and XPS analyses were utilized to observe the changes in topographical and chemical properties of the modified surfaces. The results showed that applied plasma modification altered the nanotopography and the functionality of the surfaces of the scaffolds. The modification applied for 9 min from a distance of 17 cm was found to provide the possible contact angle value (75.163 +/- 0.083) closest to the target value which is the value of tissue culture polystyrene (TCPS) petri dishes (similar to 49.7 degrees), compared to the unmodified samples (84.46 +/- 3.86). In vitro cell culture was carried out by L929 mouse fibroblast cell line in order to examine the effects of plasma surface modification on cell material interactions. Standard MIT assay showed improved cell viability on/within modified scaffolds confirmed with the observations of the cell attachment and the morphology by means of SEM, fluorescence and confocal imaging. The experiments performed in the study proved the enhanced biocompatibility of the nozzle type dry air plasma modified scaffolds. (C) 2016, The Society for Biotechnology, Japan. All rights reserved.Article Citation - WoS: 57Citation - Scopus: 60Atmospheric Plasma Surface Modifications of Electrospun Pcl/Chitosan Hybrid Scaffolds by Nozzle Type Plasma Jets for Usage of Cell Cultivation(Elsevier Science Bv, 2016) Surucu, Seda; Masur, Kai; Sasmazel, Hilal Turkoglu; Von Woedtke, Thomas; Weltmann, Klaus DieterThis paper reports Ar gas, Ar + O-2, Ar + O-2 + N-2 gas mixtures and dry air plasma modifications by atmospheric pressure argon driven kINPen and air driven Diener (PlasmaBeam) plasma jets to alter surface properties of three dimensional (3D), electrospun PCL/Chitosan/PCL layer by layer hybrid scaffolds to improve human fibroblast (MRC5) cell attachment and growth. The characterizations of the samples were done by contact angle (CA) measurements, scanning electron microscopy (SEM), X-Ray Photoelectron spectroscopy (XPS) analysis. The results showed that the plasma modification carried out under dry air and Ar + O-2 + N-2 gas mixtures were altered effectively the nanotopography and the functionality of the material surfaces. It was found that the samples treated with Ar + O-2 + N-2 gas mixtures for 1 min and dry air for 9 min have better hydrophilicity 78.9 degrees + 1.0 and 75.6 degrees + 0.1, respectively compared to the untreated samples (126.5 degrees). Biocompatibility performance of the scaffolds was determined with alamarBlue (aB) assay and MTT assay methods, Giemsa staining, fluorescence microscope, confocal laser scanning microscope (CLSM) and scanning electron microscope (SEM) analyses. The results showed that plasma treated samples increased the hydrophilicity and oxygen functionality and topography of the surfaces significantly, thus affecting the cell viability and proliferation on/within scaffolds. (C) 2016 Elsevier B.V. All rights reserved.
