Fig. 2From: De novo biosynthesis of 2-hydroxyterephthalic acid, the monomer for high-performance hydroxyl modified PBO fiber, by enzymatic Kolbe–Schmitt reaction with CO2 fixationHPLC–MS/MS analysis: a whole-cell reaction mixture of 2,3-DHBD_Ao, b 2-HTA standard, c 3-hydroxyphthalic acid standard, d 4-hydroxyphthalic acid standardBack to article page