PDF(Pubmed)
Abstract：
The aim of this study was to cover biopolymeric packaging films based on PLA/PHBV blend with a functional composite coating (to retain their ecological character) and to investigate their antimicrobial properties before and after UV irradiation. As an active coating, the carrier hydroxypropyl methyl cellulose (HPMC), as well as its modified form with Achillea millefolium L., Hippophae rhamnoides L., and Hypericum L. extract (E) and a combined system based on the extracts and nano-ZnO (EZ), was used to obtain active formulations. Additionally, film surface morphology (SEM, FTIR-ATR) and color (CIELab scale) analysis of the pre- and post-UV-treatment samples were performed. The results confirmed that the E and EZ-modified films exhibited antibacterial properties, but they were not effective against phage phi6. Q-SUN irradiation led to a decrease in the activity of E coating against Staphylococcus aureus, Pseudomonas syringae, and Candida albicans. In this case, the effectiveness of EZ against C. albicans at 24 h and 72 h UV irradiation decreased. However, the irradiation boosted the antiviral effectiveness of the EZ layer. SEM micrographs of the film surface showed that UV treatment did not significantly influence the native film morphology, but it had an impact on the coated film. FTIR analysis results showed that the coatings based on HPMC altered the IR absorption of the nonpolar groups of the biopolyester material. The applied coatings only marginally affected film color changes and increased their yellowness after UV irradiation, whereas a composite layer of nano-ZnO limited these changes.
摘要：
这项研究的目的是涵盖基于PLA/PHBV与功能性复合涂层共混物的生物聚合物包装膜（以保留其生态特征），并研究其在紫外线照射前后的抗菌性能。作为一种活性涂层，载体羟丙基甲基纤维素（HPMC），以及其与AchilleamillefoliumL.的修饰形式，沙棘，和金丝桃提取物（E）以及基于提取物和纳米ZnO（EZ）的组合系统，用于获得活性制剂。此外,薄膜表面形貌(SEM，进行UV处理前后样品的FTIR-ATR)和颜色(CIELab标度)分析。结果证实，E和EZ改性薄膜具有抗菌性能，但是它们对噬菌体phi6无效。Q-SUN辐照导致E涂层对金黄色葡萄球菌的活性降低，丁香假单胞菌,和白色念珠菌.在这种情况下,在24h和72h紫外线照射下，EZ对白色念珠菌的有效性降低。然而,辐射增强了EZ层的抗病毒效力。薄膜表面的SEM显微照片表明，UV处理没有显着影响天然薄膜的形态，但它对涂膜有影响。FTIR分析结果表明，基于HPMC的涂层改变了生物聚酯材料非极性基团的IR吸收。施加的涂层仅对薄膜颜色变化产生轻微影响，并在紫外线照射后增加其黄度，而纳米ZnO的复合层限制了这些变化。
