Preparation and Characterization of Biocomposite Films with Enhanced Oxygen Barrier and Antioxidant Properties Based on Polylactide and Extracts from Coffee Silverskin.

Publisher: MDPI Country of Publication: Switzerland NLM ID: 100964009 Publication Model: Electronic Cited Medium: Internet ISSN: 1420-3049 (Electronic) Linking ISSN: 14203049 NLM ISO Abbreviation: Molecules Subsets: MEDLINE

Original Publication: Basel, Switzerland : MDPI, c1995-

Polyesters*/chemistry ; Antioxidants*/chemistry ; Antioxidants*/pharmacology ; Oxygen*/chemistry ; Food Packaging*/methods ; Coffee*/chemistry ; Permeability* ; Plant Extracts*/chemistry; Calorimetry, Differential Scanning ; Biocompatible Materials/chemistry ; Spectroscopy, Fourier Transform Infrared ; Solubility

In the food packaging industry, significant efforts have been dedicated to addressing the pressing market demand for environmentally friendly and sustainable products. Biocomposite films based on compostable and biobased polymers represent a sustainable alternative to conventional packaging materials, offering biodegradability and enhanced functional properties. Additionally, there is growing interest in utilizing waste materials from agriculture and the food industry. This study focuses on the development of multifunctional eco-sustainable biocomposite films by combining poly(lactic acid) (PLA) as a biopolymeric matrix and extracts derived from coffee silverskin (CS), a significant agro-industrial waste byproduct of the coffee roasting process. Extracts of coffee silverskin were obtained via extraction with several solvents. Several properties of the prepared biocomposites were measured using techniques such as scanning electron microscopy (SEM), infrared spectroscopy (FTIR, ATR), differential scanning calorimetry (DSC), and oxygen and water vapor permeability, together with mechanical and physico-chemical characterization and measurements of water content, film solubility, and degree of swelling. The results demonstrate that optimized formulations of PLA/CS biocomposite films exhibit enhanced oxygen barrier properties, reduced permeability, and significant antioxidant activity. These findings underscore the potential for agro-waste valorization in creating eco-friendly food packaging solutions.

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Keywords: PLA; antioxidant activity; biocomposites; circular economy; coffee silverskin; food packaging

0 (Polyesters)
459TN2L5F5 (poly(lactide))
0 (Antioxidants)
S88TT14065 (Oxygen)
0 (Coffee)
0 (Plant Extracts)
0 (Biocompatible Materials)

Date Created: 20250327 Date Completed: 20250327 Latest Revision: 20250329

20250329

PMC11944891

10.3390/molecules30061383

40142158