Preparation of PVA/Chitosan samples by electrospinning and film casting methods and evaluating the effect of surface morphology on their antibacterial behavior

Abstract

Chitosan due to outstanding properties including biocompatibility, biodegradability, nontoxicity and antibacterial activity has received considerable attention in different fields of biomedical engineering.To study the effect of morphology and topology on antibacterial activity of chitosan, two samples of PVA/Chitosan blend with the same concentration and volume ratio were prepared using electrospinning and film casting methods. To improve the electrospinability of chitosan, it was hydrolyzed by 50% V NaOH solution (95°C for 48 h.) and PVA was used as an auxiliary polymer for electrospinning. The best electrospinning parameters for producing beadless structure were determined at a voltage of 21 kV and distance of 15 cm. Different physical and chemical characterizations of produced samples were performed using scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), viscosimetry, Atomic Force Microscopy (AFM) and antibacterial assay by two different bacterium strains including Escherichia coli (E.coli) as the gramnegative and Staphylococcus aureus (S.aureus) as the gram-positive bacteria. Antibacterial assays revealed higher sensitivity of E.coli in comparison with S.aureus in the two samples. Also, it revealed that nanotopography of surface wielded influence on the antibacterial activity of samples.

Tailored PCL Scaffolds as Skin Substitutes Using Sacrificial PVP Fibers and Collagen/Chitosan Blends

“…According to the results of Table 1 and Figure 12, coated scaffolds (sample B) against E. coli appear to have superior antibacterial effects in comparison with S. aureus after 24h. This is in consistent with the findings of our previous study [36] as well as results reported in other studies [43][44][45]. It seems that the high hydrophilicity of Gram-negative bacteria in comparison with Gram-positive species renders them more susceptible to the membrane damage via chitosan cations.…”

Polymeric Materials with Antibacterial Activity: A Review

“…The parameters frequently used to measure surface roughness are, Rp; maximum height Rz; arithmetic mean height, Ra; and root mean square height, Rq. The surface roughness can influence the type of bacteria and the amount of bacteria that adhere to the surfaces [ 164 ]. Apart from roughness, the wettability of surfaces also can affect the bacterial growth and biofilm development on surfaces.…”

Electrospun Porous Biobased Polymer Mats for Biomedical Applications

“…Chitosan-based nanofibers were utilized for wound dressing, bone scaffold, and ligands for epithelial cells. There are studies in the literature on chitosan-based nanofibers for wound dressing, bone scaffold, ligands for epithelial cells as a mixture of synthetic polymers such as polyethylene oxide (PEO), polyamide (PA6), PCL, and PVA (Alhosseini et al 2012;Charernsriwilaiwat et al 2014;Mendes et al 2016;Kuntzler et al 2018;Nokhasteh et al 2019).…”