A gas selective film for equilibrium-modified atmosphere packaging: Bio-based γ-PGA coating on plasma-modified LDPE for fresh-cut papaya preservation
Journal
LWT
Series/Report No.
LWT
Journal Volume
223
Start Page
117724
ISSN
0023-6438
Date Issued
2025-05-01
Author(s)
Sheng-Yen Tsai
Pei-Yu Wei
Chao-Kai Chang
Yu-Chi Cheng
Shella Permatasari Santoso
Shi-Ying Huang
Chang-Wei Hsieh
Abstract
This study aims to develop an equilibrium-modified atmosphere packaging (EMAP) system by incorporating poly-gamma-polyglutamic acid (γ-PGA) as a sustainable coating material to enhance gas selectivity in low-density polyethylene (LDPE) films. The objective is to achieve a controlled gas permeability that optimizes the packaging environment for extended food preservation. The γ-PGA coating treatment increases the tensile strength, gas barrier properties, and CO2/O2 selectivity of the composite film, which accelerates the gas composition change to a low-oxygen and high-carbon dioxide concentration environment for fresh-cut papaya (FCP). The prepared EMAP film coated with 5 % γ-PGA maintained a balanced gas content of 7.27 %–10.50 % CO2 and 13.03 %–7.80 % O2 for FCP over 12 days of storage, which reduced the respiration rate by 29.37 % of FCP. Quality was well maintained, with a 31.65 % reduction in weight loss and a 42.98 % reduction in firmness loss compared to the LDPE packaging. γ-PGA coating provides suitable gas transmission rate properties for fresh-cut papaya, extending the quality deterioration period by 6 days compared to pure LDPE. This research explores the potential of utilizing γ-PGA in EMAP, demonstrating its effectiveness as a sustainable coating material. The findings indicate that gas transmission and selectivity properties can be modulated by adjusting the coating concentration, offering flexibility for food preservation technologies.
Subjects
Equilibrium modified atmosphere packaging
Fresh-cut fruit
Gas barrier
Gas permeation selective
Papaya
γ-Polyglutamic acid
Publisher
Elsevier BV
Description
Article number: 117724
Type
journal article