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(A) HPLC chromatogram of the blank control group. (B) HPLC chromatogram of FS-UV-21 after 36 h of biological fermentation in PDB containing OTA (The retention time of OTA was 5.77 min, and that of peak A was 2.22 min). (C) Mass spectrum and proposed structure of OTA. (D) Mass spectrum and proposed structure of OTα. (E) Prediction of the OTA degradation process.
