A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

Figure 2

Optical absorption spectrum of a mixture containing oxalic acid, glyoxylic acid, glycolic acid, glyoxal, ethylene glycol, and acetic acid in comparison with pure glyoxylic acid, each at a concentration of 0.028 M after a reaction with tryptophan in presence of ferric chloride and concentrated sulphuric acid.