Research Article

Spectrophotometric Determination of N-Acetyl-L-Cysteine and N-(2-Mercaptopropionyl)-Glycine in Pharmaceutical Preparations

Figure 1

Effect of the pH value of the reaction mixture on the absorbance of the F e ( T P T Z ) 2 2 + complex. For each pH value, the absorbance was recorded 30 minutes after beginning of the reaction. Triplicate measurements, practically the same, were done for each pH value. Initial concentrations were 40 μM for MPG, 0.2 mM for Fe(III), and 0.2 mM for TPTZ. Reaction temperature was 25°C.
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