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<p>In this study, <i>Platycodon grandiflorus</i> polysaccharides (PGP)-hyperbranched poly-L-lysine (HBPL) composite film was prepared, and its properties were characterized. Subsequently, blueberries were selected as the model system to evaluate the preservation efficacy of the composite film. By analyzing changes in quality and nutritional characteristics of blueberries, the postharvest preservation effects of the PGP-HBPL film on fruits were assessed. The transmittance and water vapor permeability of the 2%PGP-2%HBPL composite film decreased by 25.82% and 26.86% compared with the control group, while the tensile strength, elongation at break, and water solubility increased by 58.51%, 136.73%, and 33.71% compared with the control group. In addition, the maximum scavenging rates of the composite film against ·ABTS, ·DPPH, and ·OH free radicals reached 70.18%, 63.45%, and 64.63% respectively. The results indicated that the PGP-HBPL composite film exhibited excellent mechanical strength, flexibility, barrier performance, light-blocking capability, antioxidant activity, and antibacterial activity. Application of the PGP-HBPL film effectively retarded weight loss and fruit softening in blueberries, mitigated the degradation of titratable acidity, ascorbic acid, total phenols, and anthocyanins, and suppressed the accumulation of total soluble solids and malondialdehyde. In conclusion, this study demonstrated that the PGP-HBPL composite film could significantly extend the postharvest shelf life of fruits and highlight its promising potential as an advanced fruit packaging material.</p>

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Preparation of Platycodon grandiflorus polysaccharides and hyperbranched poly-L-lysine composite film and its application in blueberry preservation

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Jianrui Sun,
  • Huanyun Ding,
  • Li Tong,
  • Ruirui Ren,
  • Jiaqi Fan,
  • Dahong Wang,
  • Shaobin Gu

摘要

In this study, Platycodon grandiflorus polysaccharides (PGP)-hyperbranched poly-L-lysine (HBPL) composite film was prepared, and its properties were characterized. Subsequently, blueberries were selected as the model system to evaluate the preservation efficacy of the composite film. By analyzing changes in quality and nutritional characteristics of blueberries, the postharvest preservation effects of the PGP-HBPL film on fruits were assessed. The transmittance and water vapor permeability of the 2%PGP-2%HBPL composite film decreased by 25.82% and 26.86% compared with the control group, while the tensile strength, elongation at break, and water solubility increased by 58.51%, 136.73%, and 33.71% compared with the control group. In addition, the maximum scavenging rates of the composite film against ·ABTS, ·DPPH, and ·OH free radicals reached 70.18%, 63.45%, and 64.63% respectively. The results indicated that the PGP-HBPL composite film exhibited excellent mechanical strength, flexibility, barrier performance, light-blocking capability, antioxidant activity, and antibacterial activity. Application of the PGP-HBPL film effectively retarded weight loss and fruit softening in blueberries, mitigated the degradation of titratable acidity, ascorbic acid, total phenols, and anthocyanins, and suppressed the accumulation of total soluble solids and malondialdehyde. In conclusion, this study demonstrated that the PGP-HBPL composite film could significantly extend the postharvest shelf life of fruits and highlight its promising potential as an advanced fruit packaging material.