The bitter taste of corn indicates that it is moldy.

1, moldy metabolites will make corn bitter, and fatty acids in corn will be decomposed, which is one of the reasons why corn flour becomes bitter.

2. The fat content of corn is relatively high, and the fat in corn is easier to hydrolyze and oxidize. Therefore, even in the case of extremely low water content, corn will be decomposed into fatty acids and glycerol if it is stored for too long, and the fat will be further oxidized to produce formaldehyde or ketone. This substance has a strong volatile smell, and this kind of corn tastes bitter. High temperature and high humidity season can accelerate this change.