Biocatalytic synthesis of 5-alkyl picolinic acid derivatives. Analytical HPLC chromatograms of each reactions at small scale (200 μL). Assay conditions: 2 mM OAH, 10 μM Fub7, 5 μM Fub9, 0.1 μM catalase, and 8 mM aldehydes mixed in phosphate buffer [50 mM K2HPO4 (pH 7.5), 100 mM NaCl, 3% (v/v) DMSO] and incubated at 20 °C. Five compounds (10, 11, 14–16) were isolated for structural characterization. N.D., not determined.