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<p>The current study investigates the potential of a silk sericin/polyvinyl alcohol (PVA) bio-composite as an edible coating to enhance the postharvest quality of banana fruits. The structural and morphological characteristics of the bio-composite were examined using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). FTIR spectra revealed alterations in hydrogen bonding interactions, while XRD and SEM analyses indicated increased crystallinity and reduced surface porosity, respectively. The minimum inhibitory concentration of silk sericin/PVA biocomposite against <i>Staphylococcus aureus</i> and <i>Pseudomonas aeruginosa</i> was 230&#xa0;µg/ml and 225&#xa0;µg/ml, respectively. The silk sericin/PVA biocomposite showed lower cytotoxicity on L929 cells with viability of 88.66 ± 3.5% after 24&#xa0;h. The silk sericin/PVA biocomposite-coated banana fruits (<i>n</i> = 20) exhibited a significant delay in ripening, reflected by lower weight loss of 12.67 ± 0.36%, a 50% reduction of total soluble solids, and slower changes in pH from 5.2 to 6.5 and a minimal 2% decrease in titratable acidity compared to the control during storage at room temperature. These findings demonstrate that the silk sericin/PVA bio-composite forms an effective barrier to moisture and gas exchange, thereby prolonging the shelf life and maintaining the quality of banana fruits for over 9 days.</p> Graphical abstract <p></p>

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Effect of silk sericin/polyvinyl alcohol bio-composite edible coating on the quality of banana fruits

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Shalini Mohan,
  • Lakshmanan Muthulakshmi,
  • Joo Shun Tan,
  • Nellaiah Hariharan,
  • Perumal Thivya

摘要

The current study investigates the potential of a silk sericin/polyvinyl alcohol (PVA) bio-composite as an edible coating to enhance the postharvest quality of banana fruits. The structural and morphological characteristics of the bio-composite were examined using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). FTIR spectra revealed alterations in hydrogen bonding interactions, while XRD and SEM analyses indicated increased crystallinity and reduced surface porosity, respectively. The minimum inhibitory concentration of silk sericin/PVA biocomposite against Staphylococcus aureus and Pseudomonas aeruginosa was 230 µg/ml and 225 µg/ml, respectively. The silk sericin/PVA biocomposite showed lower cytotoxicity on L929 cells with viability of 88.66 ± 3.5% after 24 h. The silk sericin/PVA biocomposite-coated banana fruits (n = 20) exhibited a significant delay in ripening, reflected by lower weight loss of 12.67 ± 0.36%, a 50% reduction of total soluble solids, and slower changes in pH from 5.2 to 6.5 and a minimal 2% decrease in titratable acidity compared to the control during storage at room temperature. These findings demonstrate that the silk sericin/PVA bio-composite forms an effective barrier to moisture and gas exchange, thereby prolonging the shelf life and maintaining the quality of banana fruits for over 9 days.

Graphical abstract