Novel polyquaternium compounds as safe and effective preservatives for household cleaners
A family of polycationic (polyammonium) preservative compounds originally developed for ophthalmic applications, now proposed for use in household cleaners. These one-component preservatives combine the antimicrobial efficacy of benzalkonium chloride with an improved safety profile, offering a structurally novel alternative to isothiazolinone-based preservatives with reduced allergy risk.
Overview
This offering presents a family of polycationic (polyammonium) compounds — including both defined low molecular weight substances and oligomers — designed as next-generation preservatives for household and all-purpose cleaners. Originally engineered to meet the demanding safety and efficacy requirements of ophthalmic (eye drop) formulations, these compounds are well suited for less critical applications such as cosmetics and household cleaning products.
The key value proposition is a one-component preservative system that delivers the strong antimicrobial performance of benzalkonium chloride (BAC) while maintaining a significantly improved safety profile comparable to polyquaternium-1. Because these oligomeric cationic compounds are structurally distinct from isothiazolinone-based preservatives, they present a low likelihood of causing allergic reactions or other adverse human health effects — a growing concern in the consumer products market.
Technical specifications
Compound class:
- Polycationic (polyammonium) compounds, including polyquaternium-type molecules
- Available as defined low molecular weight substances and as oligomers
- Structurally distinct from isothiazolinone preservatives
Representative antimicrobial efficacy (Minimum Inhibitory Concentration values):
- E. coli: 6–50 mg/L
- P. aeruginosa: 6–25 mg/L
- C. albicans: 1–50 mg/L
- A. brasiliensis: 3–50 mg/L
Safety and biocompatibility data:
- MTT cytotoxicity test (HCE-T cell lines): 70–94% cell viability at 0.01% concentration, 10-minute exposure
- Transepithelial Electrical Resistance (TEER): >40 to 100% at 0.01% concentration, 45-minute exposure
- Designed to combine BAC-level efficacy with polyquaternium-1-level safety
Synthesis and supply:
- Synthesis routes already developed and established
- Sample quantities readily accessible for further testing
- Scalable from milligrams to kilograms through established contract synthesis capabilities
Technology readiness level
One of the compounds in this family is already in use in an ophthalmic application, demonstrating real-world validation in a highly regulated environment. Additional efficacy testing is recommended in media and against microbial strains that better reflect the conditions of all-purpose cleaner formulations. Given that synthesis is established and samples are accessible, the compounds are positioned for rapid progression into application-specific validation studies for household cleaning products.
About ChiroBlock GmbH
ChiroBlock GmbH is a specialized chemical contract research organization (cCRO) based in Wolfen, Germany, founded in 1999. The company focuses exclusively on the synthesis of complex, non-commercial, and highly sophisticated molecules for research and development teams in industries including pharmaceuticals, biotechnology, and materials science. Its services range from the first-time synthesis of novel compounds and reference standards to route scouting, process optimization, and custom synthesis at scales from milligrams to kilograms. ChiroBlock utilizes a variety of advanced chemical technologies and operates under strict quality management, maintaining ISO 9001 certification and emphasizing full intellectual property protection and confidentiality.
By serving as a dedicated synthesis partner, ChiroBlock allows R&D organizations to outsource highly technical chemical development tasks, enabling them to reduce development timelines and minimize technical risks. The company operates on a service-based business model that excludes catalog sales or commercial production, ensuring a neutral position focused solely on solving complex synthetic challenges. Their expertise is supported by a highly qualified team, with a majority holding PhDs in chemistry, and a track record of over 100,000 successful synthesis projects. This approach provides customers with robust, reproducible synthetic routes and specialized chemicals essential for early-stage innovation and sensitive development phases.
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