A novel nisin-loaded poly (vinyl alcohol)/ wheat gluten/zirconia (Nisin-PVA/WG/ZrO 2 ) nanofibrous membranes was prepared via electrospinning technique. The drug carrier PVA/WG/ZrO 2 nanofibers showed a increase in average diameter with the increase of ZrO 2 content, and the fibers tended to conglutinate when ZrO 2 content reached 12 wt% and above. Hydrogen and Zr-O-C bonds existed among PVA, WG, and ZrO 2 units improved the thermal stability of polymeric matrix. The loading dosage of nisin caused no significant changes in the size and morphology of nanofibers at nisin content below 6 wt%. The antimicrobial activity and release experimental results showed that the nisin-PVA/WG/ZrO 2 nanofibrous membranes displayed well-controlled release and better antimicrobial activity against Staphylococcus aureus, and the nisin release from the nanofibers could be described by Fickian diffusion model. In our opinions, these nisin-PVA/ WG/ZrO 2 nanofibrous membranes may have potential as a new nanofibrous membrane in drug delivery, wound dressing, and active food packaging.
An acrylate-modified tung-oil waterborne insulation varnish was synthesized from tung oil, maleic anhydride, and acrylates via a Diels-Alder reaction and free-radical polymerization, and the varnish could be solidified at a relatively low temperature with blocked hexamethylene diisocyanate as a curing agent. The resulting films were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The insulation properties (electrical insulation strength, volume resistivity, and surface resistivity) of the varnish films were tested, and the resistances of films to salted water were evaluated. With an increase in the maleic anhydride content, the thermal stability of the film was improved, whereas the electrical insulation strength, volume resistivity, and surface resistivity decreased. The electrical insulation strength of the film after it was immersed in the NaCl solution was lower than that in dry state, and it decreased as the immersed time was prolonged. In particular, the electrical insulation strength loss of the film increased significantly at maleic anhydride contents beyond 25 wt %. Furthermore, the hardness of the film increased with increasing methyl methacrylate/N-butyl acrylate ratio, whereas the flexibility and adhesion of film decreased to a certain degree at the same time.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.