Monitoring Retrogradation in Starch-Based Films Reinforced with Plasma-Treated Lignin Using FTIR-PCA Analysis
DOI:
https://doi.org/10.55747/bjedis.v4i2.68637Abstract
Biodegradable films based on biomaterials have gained significant attention as sustainable alternatives to conventional plastic packaging, offering reduced environmental impact and potential for functional tailoring. In this study, starch films were reinforced with lignin, both untreated and modified by low-temperature plasma treatment, and analyzed after storage periods of 30 days and 2 years. The effects of lignin concentration, plasma surface modification, and sample aging were investigated through Fourier Transform Infrared Spectroscopy (FTIR) and multivariate Principal Component Analysis (PCA). Spectral data revealed variations in band intensities and shifts, particularly in regions associated with hydroxyl, methylene, and glycosidic linkages, indicating structural reorganization. PCA enabled the discrimination of samples based on lignin content, plasma treatment, and aging status, highlighting specific spectral features responsible for the observed differences. The findings demonstrate that plasma-modified lignin can alter molecular organization and long-term properties of starch films, offering a promising strategy for tuning the physicochemical behavior of biopolymeric materials.
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