Berberine Impurity 6 (CAS 65615-22-7) is a process-related degradation product encountered in berberine API manufacture and stability studies. This impurity is monitored by HPLC with UV detection and characterized by LC-MS and NMR to confirm molecular weight and structural fragments. Typical analytical concerns include coelution, response factor variation and low-level quantitation at ppm levels. Understanding its formation pathways during extraction, heat or oxidative stress enables targeted control strategies such as optimized purification, antioxidant inclusion and tight pH control. Establishing validated limits, stability-indicating methods and reference standards for Berberine Impurity 6 supports regulatory compliance and consistent product quality.
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