(R)-(+)-α-Lipoic acid (CAS 1200-22-2) impurity profile requires tight control of enantiomeric and related substance levels to ensure stereochemical integrity and batch consistency. Common impurities include the (S)-enantiomer, oxidation products, ring-opened thiolic species and trace process-related residuals. Analytical characterization uses chiral HPLC, LC-MS, NMR and GC to quantify impurities, set reporting thresholds and monitor degradation under forced stability conditions. Impurity identification supports specification limits, impurity qualification and risk assessment for downstream formulation. Implementing validated methods and stability-indicating assays minimizes impurity drift and supports regulatory compliance and reproducible quality for synthetic lots.
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