Preparation,structural characterization,and performance analysis of polyvinyl alcohol/fish gelatin/solanum nigrum anthocyanin composite film
Objective:Screening of polyvinyl alcohol-fish gelatin-solanum nigrum anthocyanin(PVA/FG-SNA)composite packaging film with optimal structure and properties.Methods:Optimizing the fabrication process of films through orthogonal tests,and using thickness,moisture content,water vapor permeability(WVP),tensile strength(TS),elongation at break(EB),Fourier infrared spectroscopy(FTIR),X-diffraction(XRD),scanning electron microscopy(SEM),and thermogravimetric(TG)analysis to explore the effects of SNAs with different mass fractions on the properties and microstructures of PVA-FG film;In addition,the pH color response and NH3 sensitivity of the PVA/FG-SNA composite film were monitored.Results:When the mass ratio of PVA-to-FG,heating temperature and time were 60∶40,95 ℃,and 1.5 h,respectively.The water solubility and WVP of the PVA-FG film were(36.03±2.63)％,and 2.91×10-4 g·mm/(m2·h·Pa),separately.With the increment of SNA dosage,the thickness,moisture content,WVP,and EB of the PVA-FG film also increased.When the mass fraction of SNA was 0.2％,the thickness,moisture content,WVP,TS,and EB of the composite film were(0.07±0.01)mm,(11.09±0.25)％,5.45×10-4 g·mm/(m2·h·Pa),(21.12±1.07)MPa,and(373.77±8.59)％,respectively.At the same time the composite film had good compatibility among its components.In addition,the PVA/FG-0.2％SNA film showed good color response under NH3 atmosphere conditions,which could be used as a pH-indicating film.Conclusion:This article optimized the water resistance of the PVA-FG composite base film.The hydrophobic and mechanical properties of the PVA-FG composite base film are negatively correlated with the amount of SNA dosage,and SNA can significantly enhance the pH and NH3 sensitivity of the film.
万方数据
维普
