Kopyrrol Aqua

Overview

Kopyrrol Aqua is the water-soluble salt form of Pyrrolidinyl Diaminopyrimidine Oxide (PDPO) paired with Oxothiazolidinecarboxylic Acid (OTZ). By converting the poorly water-soluble PDPO free base into an OTZ salt, Mironova Labs provides a cosmetically elegant form that dissolves readily into aqueous formulations without co-solvents, simplifying integration into serums, lotions, and scalp treatments.

Mechanism of Action

PDPO shares the 2,4-diaminopyrimidine N-oxide pharmacophore with minoxidil. The compound class is associated with several follicular signaling pathways:

• Potassium channel biology — Human hair follicles express ATP-sensitive K⁺ channels responsive to the minoxidil class (Shorter et al., FASEB J, 2008). PDPO is structurally related to minoxidil, though PDPO-specific K⁺ channel activity has not been characterized in published studies.
• Compound-class precedent — Minoxidil has been shown to activate β-catenin signaling in dermal papilla cells (Kwack et al., 2011) and upregulate VEGF expression (Lachgar et al., 1998). These pathways are documented for minoxidil but have not been independently confirmed for PDPO.
• OTZ contribution — The oxothiazolidinecarboxylate counterion is a well-characterized cysteine prodrug, first described by Williamson & Meister (PNAS, 1981) as a substrate for 5-oxo-L-prolinase that yields intracellular L-cysteine. OTZ supports glutathione synthesis and provides cysteine for keratin biosynthesis. Topical penetration through reconstructed human epidermis has been demonstrated (Jacques et al., Int. J. Cosmetic Science, 2021).

Composition

The salt is formed from approximately 50–60% PDPO and 40–50% OTZ by weight, with the precise stoichiometry confirmed by HPLC and elemental analysis for each batch.

Formulation Notes

• Compatible with most aqueous cosmetic systems (serums, tonics, lotions, shampoos)
• Functional at neutral to mildly acidic pH; formulate at pH 4.0–6.5 for optimal stability
• Recommended use level: 0.2–1.5% w/w for leave-on scalp products
• May be combined with other hair-active ingredients such as caffeine, niacinamide, or biotin

Regulatory Information

Kopyrrol Aqua is identified by its INCI name PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE OXOTHIAZOLIDINECARBOXYLATE. This salt does not have an assigned CAS number; the free base (PDPO) corresponds to CAS 55921-65-8. Formulators are responsible for ensuring compliance with local cosmetic regulations.