Zdanowicz Magdalena
Center of Bioimmobilisation and Innovative Packaging Materials, Faculty of Food Sciences and Fisheries, West Pomeranian University of Technology, Szczecin, Janickiego 35, 71-270 Szczecin, Poland.
Polymers (Basel). 2023 Dec 24;16(1):64. doi: 10.3390/polym16010064.
In this study, for the first time, Schreb. (E, hoary willowherb) aqueous extract was introduced into edible biopolymer films and its influence on physicochemical properties of the final products were investigated. Potato starch was gelatinized in the herbal tea to obtain thermoplastic starch (TPS) films via the casting method. The characterization of the films included mechanical, antioxidative, water (WVTR, contact angle, swelling degree) and UV radiation barrier properties as well as microstructure analysis (SEM). Obtained results indicated that the presence of the extract (rich in phenolic compounds) in the films acted as a co-plasticizer for starch and led to a higher elongation at break, up to 70%, with a parallel increase in tensile strength up to ca. 9 MPa. Moreover, TPS films with E exhibited lower WVTR values and absorption of UV light in comparison with the control TPS film. DPPH scavenging activity of TPS E films immersed in methanol was ca. 92%, and it was related to the release of the extract into liquid media. Novel TPS E films are characterized by multifunctional properties that can be used, e.g., in the active packaging sector.
在本研究中，首次将柳兰（E，灰白柳叶菜）水提取物引入可食用生物聚合物薄膜中，并研究了其对最终产品物理化学性质的影响。将马铃薯淀粉在草药茶中糊化，通过流延法获得热塑性淀粉（TPS）薄膜。薄膜的表征包括机械性能、抗氧化性能、水性能（水蒸气透过率、接触角、溶胀度）和紫外线阻隔性能以及微观结构分析（扫描电子显微镜）。所得结果表明，薄膜中提取物（富含酚类化合物）的存在充当淀粉的共增塑剂，导致断裂伸长率提高，最高可达70%，同时拉伸强度平行增加至约9兆帕。此外，与对照TPS薄膜相比，含柳兰的TPS薄膜具有更低的水蒸气透过率值和紫外线吸收率。浸入甲醇中的TPS柳兰薄膜的DPPH清除活性约为92%，这与提取物释放到液体介质中有关。新型TPS柳兰薄膜具有多功能特性，例如可用于活性包装领域。
