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Quality formation in corn kernels during postharvest ripening: the influence of storage conditions on phenolic
Fuyin Zhao1, Haohai Li1, Rixin Zang1
1College of Food Science and Engineering, Jilin Agricultural University, Changchun, Jilin 130118, China; National Engineering Research Center for Wheat and Corn Deep Processing, Changchun, Jilin 130118, China.
Abstract:
This study investigated the influence of postharvest ripening under different storage conditions on the moisture content, free phenolics and bound phenolics, individual phenolic profiles, and antioxidant activity of corn. The results indicated a time-dependent decline in moisture content, further accelerated by elevated temperatures. The levels of phenolic and flavonoid compounds dynamically fluctuated throughout storage, with peak concentrations occurring at temperature-dependent. Individual phenolic compounds exhibited distinct variation patterns under different storage conditions. Bound phenolics exhibited higher antioxidant activity than free phenolics, with the maximum capacity maintained at 15 °C. Correlation analysis revealed a significant positive correlation between phenolic content and antioxidant activity. Principal component analysis (PCA) identified 30-day storage at 15 °C as the optimal postharvest ripening conditions, achieving the maximum comprehensive score. These findings provide a feasible strategy for optimizing the postharvest ripening of corn.
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