Ethanesulfonic acid

Ethanesulfonic acid (CAS 594-45-6) is a strong aliphatic sulfonic acid used across pharmaceutical synthesis and biotechnology as a pH regulator, catalyst, and reaction medium component. Its high aqueous solubility and strong acidity make it a practical alternative to methanesulfonic acid in processes where a slightly longer carbon chain is required for solubility or selectivity.

In pharmaceutical manufacturing, this chemical is used to form stable acid addition salts with active pharmaceutical ingredients, improving crystallinity, bioavailability, and handling characteristics of drug candidates. It functions as a Brønsted acid catalyst in organic synthesis, driving esterification, cyclization, and condensation reactions under controlled conditions to ensure high yields and purity.

Biotechnology applications include its use as a buffering agent in cell culture media and enzyme assay systems where precise pH control is critical to assay reproducibility and stability. It also serves as a solvent modifier or carrier component in chromatographic and extraction processes during API purification, ensuring compliance with USP and Ph.Eur. standards.

Ethanesulfonic acid is supplied as a liquid, typically as an aqueous solution at varying concentrations, available in technical and high-purity grades suited to research and GMP production. Packaging ranges from laboratory-scale quantities to bulk drum supply depending on application requirements, meeting BP, EP, and ACS specifications for industrial use.