摘要
目的:筛选出结构与性能最优的聚乙烯醇—鱼明胶—龙葵花青素(PVA/FG-SNA)复合包装膜.方法:通过正交试验优化PVA-FG膜的制备工艺,采用厚度、水分含量、水蒸气透过率(WVP)、拉伸强度(TS)、断裂伸长率(EB)、傅立叶红外光谱分析(FTIR)、X衍射分析(XRD)、扫描电镜分析(SEM)、热重分析(TG)探究不同质量分数SNA对PVA-FG膜性能和微观结构的影响,并监测PVA/FG-SNA复合膜的pH颜色响应和NH3灵敏度.结果:当PVA-FG复配质量比为60∶40、加热温度为95 ℃、加热时间为1.5 h时,PVA-FG膜的水溶性为(36.03 士2.63)％,WVP 为 2.91×10-4 g·mm/(m2·h·Pa);随着SNA质量分数的增加,PVA-FG膜的厚度、水分含量、WVP和EB随之增加.当SNA质量分数为0.2％时,复合膜的厚度为(0.07±0.01)mm,水分含量为(11.09 士0.25)％,WVP 为 5.45×10-4 g·mm/(m2·h·Pa),TS为(21.12±1.07)MPa,EB 为(373.77士8.59)％,且复合膜的各组分之间相容性较好.此外,PVA/FG-0.2％SNA膜在NH3气氛条件下的颜色响应良好,可作为pH指示膜.结论:PVA-FG复合基膜的疏水性能和机械性能与SNA质量分数呈负相关,SNA可显著增强膜的pH和NH3敏感性.
Abstract
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.
基金项目
湖南省科技创新领军人才支持计划(2023RC1056)
湖南省杰出青年科学基金(2021JJ10007)
湖南省重点领域研发计划(2021NK2015)
维普
万方数据