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Infrared spectrometry spectrum of AFB1. (A) Spectrum of AFB1 standard. The initial AFB1 concentration was 100 ppb. (B) Spectrum of AFB1 product after 72 h incubation with culture supernatant. AFB1 biotransformation product was extracted by adding 2 mL chloroform to the incubation mixture and vortexing for 30 seconds.
