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

Figure 8

Standard curve for glyoxylic acid and optical absorption in relation to glyoxylic acid concentration at optimized conditions, 0.6 mL tryptophan 0.016 M, 2 mL ferric chloride 0.025 M, and 5 mL concentrated sulphuric acid.