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Stability of AFB1-Lys over 21 days at −20 °C, 4 °C, and 25 °C. (a) The stability at t = 14 d is showed for PBS, methanol, 50% acetonitrile as well as dried residue and dried residue + PBS salt. The stability from 0–21 d at different temperatures is showed for standards in (b) 50% ACN and (c) methanol.
