College of Food Science and Engineering, Yazhou Bay Innovation Institute, Hainan Tropical Ocean University, Marine Food Engineering Technology Research Center of Hainan Province, Collaborative Innovation Center of Marine Food Deep Processing, Sanya, Hainan 572022, China; Institute of Food Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
Institute of Food Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Hainan Key Laboratory of Herpetological Research, College of Fisheries and Life Science, Hainan Tropical Ocean University, Sanya, Hainan 572022, China.
Food Res Int. 2023 Nov;173(Pt 2):113416. doi: 10.1016/j.foodres.2023.113416. Epub 2023 Aug 29.
A novel stable PVA/HPMC/roselle anthocyanin (RAE) indicator film co-pigmented with oxalic acid (OA) was prepared, its properties, application effects and stability enhancement mechanism were investigated correspondingly. The structural characterization revealed that more stable network was formed due to the co-pigmentation facilitated generation of molecular interactions. Meanwhile, the co-pigmentation improved film mechanical and hydrophobic properties compared to both PVA/HPMC/RAE newly prepared (PHRN) or stored (PHRS) film, expressing as higher tensile strength values (12.25% and 14.44% higher than PHRN and PHRS), lower water solubility (7.22% and 10.09% lower than PHRN and PHRS) and water vapor permeability values (33.20% and 21.05% lower than PHRN and PHRS) of PVA/HPMC/RAE/OA newly prepared (PHON) or stored (PHOS) film. Compared with the PHRS film, the PHOS film still presented more distinguishable color variations when being applied to monitor shrimp freshness, owing to the stabilization behaviors of co-pigmentation in anthocyanin conformation. Hence, the co-pigmentation was an effective strategy to enhance film stability, physical and pH-responsive properties after long term storage, leading to better film monitoring effects when applied in real-time freshness monitoring.
一种新型的稳定的 PVA/HPMC/洛神花花青素（RAE）指示剂薄膜与草酸（OA）共染，研究了其性能、应用效果和稳定性增强机制。结构表征表明，由于共染促进了分子相互作用的产生，形成了更稳定的网络。同时，与新制备的 PVA/HPMC/RAE（PHRN）或储存的 PVA/HPMC/RAE（PHRS）薄膜相比，共染提高了薄膜的机械和疏水性性能，表现为拉伸强度值更高（比 PHRN 和 PHRS 分别高 12.25%和 14.44%）、水溶性更低（比 PHRN 和 PHRS 分别低 7.22%和 10.09%）和水蒸气渗透率值更低（比 PHRN 和 PHRS 分别低 33.20%和 21.05%）。与 PHRS 薄膜相比，当应用于监测虾类新鲜度时，PHOS 薄膜仍然呈现出更明显的颜色变化，这归因于共染对花青素构象的稳定作用。因此，共染是一种有效的策略，可以在长期储存后提高薄膜的稳定性、物理和 pH 响应性能，从而在实时新鲜度监测中获得更好的薄膜监测效果。
