4.7 Article

Optimization of heat-sealing properties for antimicrobial soybean protein isolate film incorporating diatomite/thymol complex and its application on blueberry packaging

Journal

FOOD PACKAGING AND SHELF LIFE
Volume 29, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.fpsl.2021.100690

Keywords

Active packaging; Protein; Sealing strength; Biodegradability

Funding

  1. Sichuan Science and Technology Pro-gram [2019YFN0174]
  2. National College Students Innovation and Entrepreneurship Training Program [202010626051, 201910626022S]

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The heat-sealing parameters of the S/D/T film were optimized to achieve maximum sealing strength, effectively preserving blueberry quality and outperforming other groups. Additionally, the biodegradability of the S/D/T film in soil was confirmed within 8 days.
Heat-sealing parameters of the as-prepared antimicrobial soybean protein isolate (SPI) film incorporating diatomite/thymol complex (S/D/T film) were optimized using single factor experiment and response surface methodology, and further used to seal the films into packaging bags to preserve blueberries at 25 degrees C and 70% relative humidity. The S/D/T film had a maximum sealing strength of 2.41 N/15 mm at the optimized sealing conditions of 139.5 degrees C, 2.5 s and 0.48 MPa due to the strong physical intermolecular interaction induced upon heat-sealing areas as confirmed by FT-IR and SEM. Moreover, the S/D/T film could effectively delay the deterioration in blueberry quality during 5 days of storage, exhibiting better fresh-keeping effect than other groups. Additionally, all films were completely biodegraded in soil within 8 days. In summary, the developed antimicrobial protein films with improved heat-sealing ability and excellent biodegradability can provide a promising alternative to nondegradable synthetic materials in active packaging.

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