Kozakiewicz Gabriela, Małajowicz Jolanta, Karwacka Magdalena, Ciurzyńska Agnieszka, Szulc Karolina, Żelazko Anna, Janowicz Monika, Galus Sabina
Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland.
Department of Chemistry, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland.
Materials (Basel). 2025 Aug 15;18(16):3831. doi: 10.3390/ma18163831.
This study introduces an innovative strategy for active, biodegradable food packaging through the incorporation of gamma-decalactone (GDL), a natural aromatic compound with antimicrobial properties, into apple-pectin-based edible films. The addition of GDL significantly modified the film structure, resulting in enhanced light barrier properties (the opacity increased from 1.10 to 8.64 a.u./mm), a more porous microstructure (confirmed by SEM), and reduced tensile strength (from 13.84 to 5.68 MPa). The films also exhibited lower water vapour sorption (from 1.45 to 0.80 g/g dry matter (d.m.) and increased gas permeability. FTIR analysis confirmed interactions between GDL and the polymer matrix. The films with GDL added exhibited antimicrobial properties against various microbial species, such as bacteria, yeasts, and moulds. A 5% addition of GDL to the coating completely inhibited the growth of bacteria and , reducing the number of yeast cells by 3 log units (after 48 h of culture, from 7.11 ± 0.09 to 4.09 ± 0.27 log CFU/mL) and limiting mycelium growth by 70%. These results highlight GDL's dual function as a natural aromatic and antimicrobial agent, supporting its potential application in sustainable packaging for perishable foods.
本研究通过将具有抗菌特性的天然芳香化合物γ-癸内酯（GDL）掺入苹果果胶基可食用薄膜中，引入了一种用于活性、可生物降解食品包装的创新策略。GDL的添加显著改变了薄膜结构，导致其阻光性能增强（不透明度从1.10增加到8.64 a.u./mm），微观结构更具多孔性（经扫描电子显微镜证实），拉伸强度降低（从13.84 MPa降至5.68 MPa）。这些薄膜还表现出较低的水蒸气吸附率（从1.45降至0.80 g/g干物质（d.m.））并提高了气体渗透性。傅里叶变换红外光谱分析证实了GDL与聚合物基质之间的相互作用。添加GDL的薄膜对各种微生物物种，如细菌、酵母和霉菌，具有抗菌性能。在涂层中添加5%的GDL可完全抑制细菌生长，并使酵母细胞数量减少3个对数单位（培养48小时后，从7.11±0.09降至4.09±0.27 log CFU/mL），并使霉菌丝生长受限70%。这些结果突出了GDL作为天然芳香剂和抗菌剂的双重功能，支持了其在易腐食品可持续包装中的潜在应用。
