Pharmaceutical Standardization of Shilasindur: A Comparative Study of Formulation Techniques and Analytical Methods

Background

Shilasindur (SS) is a mercurial Kupipakwa rasayan (sublime product) composed of purified mercury (Parada), sulphur (Gandhaka), and realgar (Manahshila). Traditionally used to treat skin and respiratory disorders, this study aims to evaluate and establish pharmaceutical and analytical standardization for SS by comparing traditional and modern manufacturing techniques.

Materials and Methods

The study involved preparing SS through two distinct methods: the traditional Valuka Yantra (sand bath) and the modern Electric Muffle Furnace (EMF), with three batches prepared for each. The formulations were evaluated based on pharmaceutical observations and standardized using organoleptic tests, physicochemical analysis, and advanced analytical parameters, including AAS, XRD, FTIR, and ICP-OES. Microbial contamination was also monitored to ensure safety.

Results

The EMF method demonstrated a significantly higher average yield of 59.93% compared to 43.46% in the Valuka Yantra method. Pharmaceutical observations revealed that the Valuka Yantra method required more fuel, manual labor, and time than the EMF method. Analytical testing confirmed the absence of microbial load in both samples. Both methods produced chemically stable products, with XRD identifying α-mercury sulphide as the predominant crystalline phase and FTIR confirming stable metal–sulphur and metal–oxygen bonding.

Conclusion

The Electric Muffle Furnace is a superior, more efficient, and reproducible alternative to the traditional Valuka Yantra for the large-scale manufacturing of Shilasindur. Both preparation methods yield formulations that are chemically stable, microbiologically safe, and pharmaceutically potent, aligning with both Ayurvedic principles and modern scientific standards.