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HPLC-DAD analysis of an extract obtained by incubation of YPD medium supplemented with FBP and Z. rouxii cells with o-phenylenediamine overnight (top), of YPD medium supplemented with FBP with o-phenylenediamine overnight (middle), and of YPD medium with o-phenylenediamine overnight (bottom). Column effluent was monitored at 318 nm. Unlabeled peaks did not show absorption maxima at 238 and 318 nm.
