... Abstract Using chromatography and spectrophotometry for investigation of reaction of 1,1-dimethylhydrazine (UDMH), methylhydrazine (MH) and 2-hydroxyethylhydrazine (HEH) with excess of glyoxal (Gl) and glyoxylic acid (GlA) in aqueous solutions it was shown that corresponding monohydrazone was produced as the single derivatization product. ... Moscow University Chemistry Bulletin . 2013, Vol. ... Copyright (C) Chemistry Dept., ... Copyright (C) Chemisty Department of Moscow State University . ...