2.2.2. Purification
Immunoaffinity columns were used to purify AFB1, AFB2, AFG1 and AFG2.
2.2. Feed sample analysis using the HPLC method
2.2.1. Extraction
The feed samples were ground into fine particle. Ground feed (25.0 g) was mixed with 125 mL of 70% (v/v) methanol and 5.0 g of NaCl in a 250 mL triangular flask, and then sonicated for 30 min. The mixturewas then filtered with quantitative filter paper, and the filtratewas diluted twice with Milli Qwater. The diluted filtratewas retained for purification.