Physicochemical properties, structural analysis and CO2 concentrations of corn grains stored under different conditions

This study aimed to evaluate the effects of storage conditions (hermetic and non-hermetic), initial moisture content (14, 16, and 18 % wb), and storage time (0, 30, 60, 90, and 120 days) on corn grains quality. During the storage period, the concentration of CO₂, temperature, relative humidity, proximal composition, dry matter loss, starch, and insect damage were evaluated. The BRS284 corn grains were harvested and stored with an initial moisture content of 18, 16, and 14 % wb. The [CO₂], temperature, and relative humidity were monitored by sensors in grain mass and ambient air for up to 120 days, at 1-h intervals. The results indicated increases in [CO₂], temperature, and relative humidity in the grain mass, with increased storage time and higher moisture content. The rates of dry matter loss increased for both conditions, more intense for non-hermetic storage, no insect was observed in grains stored hermetically. The ether extract and protein contents decreased with rising moisture content and storage time, while starch granules tended to compact with increasing moisture content.