Quaternium-73

Quaternium-73 (CAS 15763-48-1, EC 239-852-5) is a quaternary ammonium compound with antimicrobial activity, also known under trade names including Pionin, BIOXYNE, NK 266, and Kankohso 201. It carries no assigned E-code. Its molecular formula is C23H39N2S2.I, incorporating a benzothiazolium-based cationic structure.

In personal care formulations, Quaternium-73 functions as a preservative by disrupting microbial cell membranes, providing activity against bacteria and fungi at low use concentrations. In pharmaceutical and healthcare product manufacturing, it is applied as a biocidal agent where controlled antimicrobial efficacy is required in topical or surface-contact contexts.

Quaternium-73 is subject to REACH registration requirements for EU market supply. Procurement teams should confirm supplier compliance documentation, including Safety Data Sheets aligned with EU GHS standards. Packaging formats and available grades vary by supplier; buyers should request specification sheets confirming purity and identity prior to order.