Quality Variations in Flat Peaches Wrapped in Different Plastic Wraps during Cold Storage and Shelf Storage at Room Temperature
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Abstract:
Flat peaches were packed with different plastic wraps to study preservation performance in cold storage and shelf storage at room temperature. Beijing Pinggu flat peaches were used in this study and were divided into four groups. For the control group (CK), ordinary plastic wraps were adopted. The peaches in the three experimental groups were wrapped in anti-fog, PE, and PLA films. The peaches were first placed in cold storage and then placed onto shelves at room temperature for 3 days before taking measurements. Measurements were recorded every 10 days to analyze variations in the sensory quality, hardness, physiological indexes, and nutrient levels. The results demonstrate that all the three plastic wraps used in the experimental groups enabled air flow. On the 40th day, the highest oxygen content (20.53%) and the lowest carbon dioxide content (0.21%) were measured for the CK group. The oxygen levels for the groups using the anti-fog, PE, and PLA films were 19.90%, 20.33%, and 20.10%, respectively, and the carbon dioxide levels were 0.93%, 0.63%, and 0.98%, respectively. During both cold storage and shelf storage at room temperature, the rotting and browning indices increased. Rotting and browning were noted first in the CK group, and the indices in this group were the highest. The sensory quality was the highest for the PLA-wrapped peaches. Compared to the peaches in the CK group, those in the other three experimental groups aged relatively slowly and the nutrient losses reduced. SPSS analysis results suggested that the comprehensive scores of the different groups ascended in the following order CK group < anti-fog film group < PE film group < PLA film group. Optimal preservation performance was noted for the PLA-wrapped peaches. In summary, using plastic wraps helps to keep peaches fresh during both cold storage and shelf storage at room temperature. In particular, PLA films outperform other types of wrapping.
