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<p>In recent years, the increasing awareness of the negative environmental impact of plastic materials has led to a growing demand for sustainable alternatives in packaging applications. Biodegradable packaging has emerged as a promising solution, particularly in food packaging. This study focuses on developing thin, biodegradable polymeric films containing carbon char embedded in a polyvinyl alcohol (PVA) and chitosan (CH) composite matrix for use in the food industry. Various physical and chemical properties of synthesized films were analyzed, and their packaging effectiveness was evaluated by assessing food longevity and freshness. To conduct the study, lemons were stored at room temperature (32&#xa0;°C) and a relative humidity (RH) of 60%. The results demonstrated that the moisture retention ability (MRA) of the PVA/CH4/carbon char film improved from 91.7 to 94.3% compared to the base PVA/carbon char film. In addition, the water vapor transmission rate (WVTR) significantly decreased from 85.1 to 65.3&#xa0;g/m<sup>2</sup>·h in the PVA/CH4/carbon char film. Notably, the microbial degradation of the PVA/CH4/carbon char film reached 91%, while its soil degradation rate was 55%, both of which were substantially higher than those of the pristine PVA/carbon char and commercial films. The findings of our work suggest that increasing the chitosan concentration enhances the food preservation properties of the films. At a chitosan concentration of 4% (by wt), the packaging effectively preserved food freshness for over 22&#xa0;days, confirming its potential applicability in food packaging.</p> Graphical Abstract <p></p>

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Evaluation of packaging film properties of carbon char induced chitosan/poly(vinyl alcohol) active composite film to enhance the shelf-life of fresh vegetable

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Paulami Banerjee,
  • Mrinal Kanti Mandal,
  • Rajib Ghosh Chaudhuri

摘要

In recent years, the increasing awareness of the negative environmental impact of plastic materials has led to a growing demand for sustainable alternatives in packaging applications. Biodegradable packaging has emerged as a promising solution, particularly in food packaging. This study focuses on developing thin, biodegradable polymeric films containing carbon char embedded in a polyvinyl alcohol (PVA) and chitosan (CH) composite matrix for use in the food industry. Various physical and chemical properties of synthesized films were analyzed, and their packaging effectiveness was evaluated by assessing food longevity and freshness. To conduct the study, lemons were stored at room temperature (32 °C) and a relative humidity (RH) of 60%. The results demonstrated that the moisture retention ability (MRA) of the PVA/CH4/carbon char film improved from 91.7 to 94.3% compared to the base PVA/carbon char film. In addition, the water vapor transmission rate (WVTR) significantly decreased from 85.1 to 65.3 g/m2·h in the PVA/CH4/carbon char film. Notably, the microbial degradation of the PVA/CH4/carbon char film reached 91%, while its soil degradation rate was 55%, both of which were substantially higher than those of the pristine PVA/carbon char and commercial films. The findings of our work suggest that increasing the chitosan concentration enhances the food preservation properties of the films. At a chitosan concentration of 4% (by wt), the packaging effectively preserved food freshness for over 22 days, confirming its potential applicability in food packaging.

Graphical Abstract