Effect of Spontaneous Atmosphere Modification of Packaging with Different Thicknesses on the Quality of Honey Peaches

To investigate the effects of different thickness packaging on the postharvest quality of honey peaches, a study was conducted using 'Baixue' honey peaches as the experimental material. The honey peaches were packaged in polyethylene fresh-keeping bags of three different thicknesses: 0.040 mm, 0.055 mm, and 0.080 mm, without polyethylene fresh-keeping bags packaging as the control group (CK) and all samples were stored at (4±1 ℃), this study investigated the impact of polyethylene fresh-keeping bags of varying thicknesses on the quality indices, gas content within the fresh-keeping bags, and related enzyme activities of honey peaches. The results indicated that, compared to the control group, the packaging of polyethylene fresh-keeping bags of varying thicknesses effectively prolonged the quality of honey peaches. When the honey peaches were packaged in a 0.080 mm thickness fresh-keeping bag and stored for 42 days, the fruit retention rate reached 100%. This result was significantly better than that of the CK group and the 0.040 mm treatment group (P<0.05), but not significantly different from the 0.055 mm treatment group (P>0.05). The weight loss rate was only 0.44%, and the soluble solids content was 10.27%, both of which were significantly lower than those of the CK group (P<0.05). However, these values were not significantly different from those of the 0.040 mm and 0.055 mm treatment groups (P>0.05). The firmness of the fruit decreased by 30.42% compared to the initial firmness, which was significantly better than that of the CK group, 0.040 mm and 0.055 mm treatment groups (P<0.05). The O₂ and CO₂ concentrations in the fresh-keeping bags were 1.10% and 10%, respectively, and were significantly different from those in the 0.040 mm and 0.055 mm treatment groups (P<0.05). The honey peaches exhibited color parameters of L^*=69.21, a^*=9.95, b^*=15.4 and the titratable acidity was measured at 1.4%. These values were significantly different from those of the CK group and the 0.040 mm and 0.055 mm treatment groups (P<0.05). The polyphenol oxidase activity was 24.12% lower than that of the control group, which was significantly better than the CK group and the 0.055 mm treatment group (P<0.05). However, it was not significantly different from the 0.040 mm treatment group (P>0.05). In conclusion, the 0.080 mm polyethylene fresh-keeping bags significantly extended the storage period of honey peaches, thereby providing a theoretical foundation for honey peach preservation technologies.