- Moisture Content: The Codex standard suggests a maximum moisture content of approximately 15.5% (m/m). For storage and transport in warmer climates or over extended periods, a lower moisture content is often recommended to prevent fungal growth and spoilage.
Extraneous Matter: Maize should contain minimal extraneous matter. Its specification typically differentiates between:
Organic Extraneous Matter: Generally allowed up to about 1.5% (m/m), which can include foreign seeds or plant parts.
Inorganic Extraneous Matter: Limited to approximately 0.5% (m/m) such as stones or dust.
Filth and Impurities: The grain must be free from excessive filth (including dead insects or animal matter) that could be a health hazard. It’s crucial that the maize is also free from abnormal flavors, odors, or evidence of microbial contamination such as mold or yeast.