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Didecyl Dimethyl Ammonium Chloride (DDAC)-Broad-Spectrum Disinfectant

Didecyl Dimethyl Ammonium Chloride (DDAC, CAS 7173-51-5): Overview

1. Introduction

DDAC (Didecyl dimethyl ammonium chloride, CAS 7173-51-5) is a quaternary ammonium compound widely used as a cationic surfactant and disinfectant. Its molecular structure includes two decyl (C10) alkyl chains, providing strong cationic activity and pronounced antimicrobial effects against a broad spectrum of microorganisms, including bacteria, fungi, molds, and enveloped viruses. DDAC is commonly used in household cleaners, institutional disinfectants, food processing sanitizers, and water treatment applications.

2. Chemical Structure and Physicochemical Properties

Molecular formula: C₂₂H₄₈ClN

Molecular weight: 362.08 g/mol

CAS number: 7173-51-5

EC number: 230-525-2

Appearance: Clear to pale yellow liquid (typically 50–80% aqueous solution)

Solubility: Soluble in water and polar organic solvents; forms micelles in aqueous solution, exhibiting surfactant properties

Stability: Stable under normal temperatures and pH; decomposes under extreme conditions (strong alkalis, high temperatures)

Compatibility: Compatible with non-ionic surfactants; loses activity when mixed with anionic components

3. Mechanism of Antimicrobial Action

DDAC acts through a dual mechanism:

Membrane disruption: The positively charged quaternary ammonium head group binds to negatively charged components of microbial cell membranes, causing membrane destabilization, leakage of cytoplasmic contents, and cell death.

Surfactant action: As a cationic surfactant, DDAC reduces surface tension, enhancing wetting and penetration of surfaces.

DDAC is effective against Gram-positive and Gram-negative bacteria, fungi, yeasts, molds, and enveloped viruses (including coronaviruses, HIV, and herpes simplex virus). It is less effective against non-enveloped viruses and bacterial spores.

4. Applications

Household and institutional cleaning: Used in surface disinfectants, multi-purpose cleaners, floor cleaners, bathroom cleaners, and sanitizing wipes.

Food processing: Applied for sanitation of conveyor belts, food contact surfaces, and processing equipment, with strict adherence to regulatory limits.

Water treatment: Used as a biocide and algaecide in swimming pools, cooling towers, and industrial water systems.

Animal husbandry: Used for disinfection of livestock facilities, equipment, and transport vehicles to prevent disease transmission.

Healthcare: Used in disinfectant solutions for surfaces, instruments, and medical equipment.

5. Safety and Toxicology

Skin and eye irritation: May cause skin dryness, itching, and irritation upon direct contact; causes serious eye irritation (H318).

Inhalation: May cause respiratory tract irritation; use with adequate ventilation.

Ingestion: Harmful if swallowed (H302); may cause nausea, vomiting, and CNS depression at high doses.

Regulatory status: Subject to concentration limits in various countries. Requires appropriate labeling and Safety Data Sheets (SDS).

Environmental: Moderately biodegradable; toxic to aquatic organisms at high concentrations. Avoid discharge into waterways.

6. Advantages and Limitations

Advantages:

  • Broad-spectrum antimicrobial activity.

  • Effective at low concentrations (typically 0.01–0.5%).

  • Good water solubility and surfactant properties.

  • Stable under normal storage conditions.

  • Compatible with non-ionic surfactants.

Limitations:

  • Incompatible with anionic surfactants (precipitates).

  • May cause skin and eye irritation.

  • Reduced efficacy in the presence of organic matter.

  • Environmental persistence at high concentrations.

7. Conclusion

Didecyl dimethyl ammonium chloride (DDAC, CAS 7173-51-5) is a versatile and effective cationic quaternary ammonium disinfectant with broad-spectrum antimicrobial activity. Its applications span household cleaning, food processing, water treatment, and animal husbandry. When used within recommended concentrations and safety guidelines, DDAC provides reliable microbial control with an acceptable safety profile. Ongoing research continues to explore improved formulations and environmentally sustainable alternatives to enhance its safety and efficacy.

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