Research Article
Spectrophotometric Determination of N-Acetyl-L-Cysteine and N-(2-Mercaptopropionyl)-Glycine in Pharmaceutical Preparations
Table 4
Comparison of the equilibrium spectrophotometric methods for NAC and MPG determination.
| Analyte | Reagent(s) used | (nm) | Beer's law range (μM) | ε (M−1 cm−1) | Reference |
| NAC, MPG, penicillamine | Fe(III)/1,10-phenanthroline | 515 | 4.0–80.0 | 1.1 × 104 | [24] | NAC | PdCl2 | 375 | 24.5–400.0 | Not reported | [23] | NAC | o-phthalaldehyde/isoleucine | 335 | 3.0–300.0 | 6.3 × 104 | [22] | Cysteine, NAC | Fe(III)/ferrozine | 562 | 0.1–36.8 | 2.3 × 104 | [21] | NAC | /leucoxylenecyanol | 613 | 1.2–9.8 | 9.6 × 104 | [19] | NAC MPG | Fe(III)/TPTZ | 593 | 1.0–100.0 | 2.2 × 104 | Present work |
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