Abstract

KWATHA KALPANA AND MODERN HERBAL EXTRACTION TECHNOLOGIES: AN INTEGRATIVE REVIEW OF PHARMACEUTICAL ADVANCES, PHYTOCHEMICAL STANDARDIZATION, AND TRANSLATIONAL THERAPEUTICS

Priyanka Sharma*, P. K. Prajapati, Sunil K. Dubey

Abstract

Kwatha Kalpana, the aqueous decoction anchoring the Panchavidha Kashaya Kalpana of Ayurvedic pharmaceutics remains the most widely dispensed classical dosage form and the foundational extraction step for Arishta, Ghana, and Sneha preparations. Modern manufacturing has progressively substituted selective, marker-maximizing platforms -ultrasound, microwave, pressurized-liquid, and green-solvent (NADES)-based extraction for classical boiling, generally without demonstrating pharmaceutical or clinical equivalence to the decoction replaced. This review integrates classical pharmaceutics, pharmacopeial regulation, phytochemical mechanism, industrial/green-chemistry economics, and clinical-trial methodology to interrogate that substitution. Quantitative thermal-degradation kinetics show that markers such as gallic acid and curcumin are simultaneously generated and destroyed during boiling, while saponins undergo thermally driven conversion to more permeable species; co-decoction of polyherbal mixtures is demonstrably non-additive, shifting individual markers 1.17 to over 30-fold relative to separately prepared extracts; and decoction generates emergent colloidal and supramolecular matter self-assembled nanospheres and heat-stable "decoctosomes"—that selective extraction cannot reproduce. Set against this is a countervailing industrial reading: open-vessel boiling is energy- and time-inefficient relative to subcritical water extraction and other green platforms, which recover markers at a fraction of the energy cost and enable defensible commercial scale-up. India additionally lacks any regulatory analogue to China's "standard decoction" benchmark for demonstrating consistency between a decoction and its industrial derivative, and clinical trials of Kwatha-derived products almost never report the pharmaceutics of the tested article. We enumerate the research gaps and propose a tiered equivalence framework together with a PICO-structured non-inferiority trial design as the field's most urgent methodological priority.

Keywords: Kwatha Kalpana; Bhaishajya Kalpana; subcritical water extraction; phytochemical standardization; pharmacokinetics; Ayurvedic Pharmacopoeia of India.