Akachat Belkis, Himed Louiza, Torche Assala, Khelef Yahia, Barkat Malika, Salah Merniz, D'Elia Maria, Rastrelli Luca, Terzioğlu Pınar
Laboratory of Biotechnology and Food Quality (BIOQUAL), Department of Food Biotechnology, Institute of Nutrition, Food and Agro-Food Technologies (INATAA), Freres Mentouri University 1, Constantine 25000, Algeria.
Research Laboratory "Protection of Ecosystems in Arid and Semi-Arid Zones ECOSYS", KASDI University Merbah, Ouargla 30000, Algeria.
Foods. 2025 Apr 30;14(9):1576. doi: 10.3390/foods14091576.
This research explores how varying glycerol concentrations (0-30 wt%) affect the physicochemical and mechanical characteristics of pectin films, derived from waste and enriched with lemon essential oil. The films were produced using the casting method. The findings show that glycerol significantly impacts film thickness, swelling behavior, water solubility, moisture content, water vapor permeability, and structural and mechanical characteristics. FTIR spectroscopy confirmed molecular interactions between glycerol and the film matrix. Notably, films with 20-30 wt% glycerol had reduced transparency. Mechanically, glycerol increased the elongation at break, enhancing flexibility, while a 5 wt% glycerol concentration optimized tensile strength. However, higher glycerol levels led to decreased tensile strength. Principal Component Analysis identified 5 wt% glycerol as optimal for balancing flexibility and structural integrity. Additionally, glycerol-plasticized films were more hydrophilic than the control. These results highlight glycerol's crucial role as a plasticizer and the importance of precise concentration control in biodegradable film formulations.
本研究探讨了不同甘油浓度（0-30重量%）如何影响源自废弃物并富含柠檬精油的果胶膜的物理化学和机械特性。这些膜采用流延法制备。研究结果表明，甘油对膜厚度、溶胀行为、水溶性、水分含量、水蒸气透过率以及结构和机械特性有显著影响。傅里叶变换红外光谱证实了甘油与膜基质之间的分子相互作用。值得注意的是，含有20-30重量%甘油的膜透明度降低。在机械性能方面，甘油增加了断裂伸长率，提高了柔韧性，而5重量%的甘油浓度优化了拉伸强度。然而，较高的甘油含量导致拉伸强度降低。主成分分析确定5重量%的甘油最适合平衡柔韧性和结构完整性。此外，甘油增塑的膜比对照膜更具亲水性。这些结果突出了甘油作为增塑剂的关键作用以及在可生物降解膜配方中精确控制浓度的重要性。
