CAS Number:
18472-51-0
Chem/ INCI Name:
Chlorhexidine Digluconate (Chlorhexidine Gluconate, CHG)
Common Form:
Typically supplied as an aqueous solution (e.g., 20% w/v)
Molecular Formula:
C22H30Cl2N10 · 2C6H12O7 or C34H54Cl2N10O14
Molecular Weight:
897.76 g/mol
Uses:
Chlorhexidine Digluconate is a cationic broad-spectrum antimicrobial agent from the bis(biguanide) family. It is the most common water-soluble salt form of chlorhexidine, widely used as a topical antiseptic and disinfectant.
· Healthcare Antisepsis: The gold-standard antiseptic for skin disinfection before surgeries, injections, and catheter insertions to prevent infections.
· Oral Care: Used in prescription mouthwashes and chips to treat gingivitis and periodontal disease.
· General Disinfection & Preservation: Found in surgical scrubs, hand soaps, wound cleansers, and as a preservative in some cosmetics and pharmaceutical products.
What does Chlorhexidine Digluconate do in a formulation?
· Antimicrobial Agent / Preservative: Its primary function. It acts by binding to and destabilizing microbial cell membranes, causing cell content leakage and death.
· Substantivity: Binds to skin and mucous membranes (like in the mouth), providing prolonged residual antimicrobial activity even after rinsing.
Safety Profile:
· General Toxicity: Considered safe for topical use with low systemic absorption. However, concentrated solutions are for dilution only and can cause severe eye damage.
· Allergic Reactions: Can cause rare but serious allergic reactions, including anaphylaxis. The FDA mandates warnings on labels.
· Specific Warnings:
· Aquatic Toxicity: Very toxic to aquatic life with long-lasting effects.
· Use in Infants: Safety not fully established for infants under 2 months; use in preterm infants requires caution.
· Oral Ingestion: Toxic if swallowed; small amounts can cause gastric distress in children.
Technical profile:
| Property | Values |
| Appearance | Colorless to pale yellow clear liquid |
| Assay/Concentration | 18.0 - 21.0% w/w |
| Density | ~1.06 - 1.07 g/mL at 20-25°C |
| pH | Stable in neutral aqueous solutions |
| Solubility | Miscible with water, ethanol, and acetone |
| Storage & Handling | · Storage Temperature: Refrigerated (2-8°C). · Sensitivity: Sensitive to light and heat. · Incompatibilities: Strong oxidizing agents. |