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Abstract
This paper describes the qualitative and quantitative determination of ∊-caprolactam and ∊-aminocaproic acid, which are potential contaminants of polyamid 6, by instrumental thin-layer chromatography (planar chromatography). A validation of the method is proposed. Detection was performed by photodensitometry in UV range at 200 nm for ∊-caprolactam, and at 588 nm after derivatization by ninhydrin reagent for ∊-aminocaproic acid. Correlation coefficients for calibration were found about 0.996–0.999. Repeatability results were included between 2.4% and 5.5%. Derivatization by Overpressured Derivatization (OPD) technique gave similar results as direct UV detection.