Hima Kalpana and Modern Cold Maceration: A Comparative Review of Extraction Dynamics

Extraction of bioactive constituents from medicinal plants is a fundamental process in both traditional and modern systems of medicine. Ayurveda describes Hima Kalpana, a classical cold aqueous extraction method under Panchavidha Kashaya Kalpana, primarily indicated for heat-sensitive and aromatic drugs. Modern phytochemical science employs cold maceration as a non-thermal extraction technique to preserve thermolabile constituents. Despite originating from different knowledge systems, both methods share comparable extraction dynamics based on prolonged solvent–drug interaction at low temperatures. This review critically compares Hima Kalpana and modern cold maceration with respect to their conceptual basis, methodology, extraction dynamics, phytochemical implications, advantages, and limitations. Emphasis is placed on the Ayurvedic pharmacological rationale of Hima Kalpana and its relevance to contemporary extraction science. The comparative analysis highlights the potential for integrative approaches in herbal drug research and standardization.