Aflatoxin B1 is soluble in organic solvent like Chloroform, Benzene, Methanol, Acetonitrile etc. But after time it may loose quantity. Also temperature and light are degrading aflatoxin B1. Stability depends upon exposure time of light.
I agree with the previous answer, light significantly affects aflatoxin stability in solution. According to my experience methanol is a good solvent and aflatoxins (B1, B2, G1 and G2) are stable for months if you dissolve them in methanol and keep in an amber vial at -20°C or, at least at 4°C. If you dissolve aflatoxins in a methanol: water mixture 50:50 v/v, the stability is significantly affected (no more than 1 month even at 4°C).
I agree with the previous answer, light significantly affects aflatoxin stability in solution. According to my experience methanol is a good solvent and aflatoxins (B1, B2, G1 and G2) are stable for months if you dissolve them in methanol and keep in an amber vial at -20°C or, at least at 4°C. If you dissolve aflatoxins in a methanol: water mixture 50:50 v/v, the stability is significantly affected (no more than 1 month even at 4°C).
Actually, I verified what I wrote through my experience, however the study indicated could be useful
Diaz GJ, Cepeda SM, Martos PA. Stability of aflatoxins in solutions J AOAC Int. 2012 Jul-Aug;95(4):1084-8.
This is true, stability of these mycotoxin is an issue. As per my previous experience, I agree with Alessandra Ricelli answer.
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