|ATC code||D08, D09 (dressing), R02|
|Appearance||100% is white or yellow powder; gelatinous lumps; Solutions BC50 (50%) & BC80 (80%) are colorless to pale yellow solutions|
|Solubility in water||very soluble|
|EU classification||C, N |
|R-phrases||R21/22, R34, R50 |
|S-phrases||(S2), S36/37/39, S45, S61 |
|Flash point||250 °C (482 °F; 523 K) (if solvent based)|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Benzalkonium chloride, also known as BZK, BKC, BAC, alkyldimethylbenzylammonium chloride and ADBAC, is a cationic surface-acting agent belonging to the quaternary ammonium group. It has three main categories of use: as a biocide, a cationic surfactant, and phase transfer agent in the chemical industry. The chemical is a heterogeneous mixture of alkylbenzyldimethylammonium chlorides of various even-numbered alkyl chain lengths.
Benzalkonium chloride is used as an active ingredient in many consumer products:
- Pharmaceutical products such as eye, ear and nasal drops or sprays, as a preservative
- Personal care products such as hand sanitizers, hygienic towelettes and wet wipes
- Aftershave, deodorants, hair products and cosmetics
- Skin antiseptics, such as Bactine and Dettol
- Throat lozenges and mouthwashes, as a biocide
- Spermicidal creams
- Over-the-counter single-application treatments for herpes, cold-sores, and fever blisters, such as RELEEV and Viroxyn
- Burn and ulcer treatment
- Laundry detergents and treatments
- Softeners for textiles
- Cleaners for floor and hard surfaces as a disinfectant, such as Lysol
- Spray disinfectants for hard surface sanitization
- Algaecides for clearing of algae, moss, lichens from paths, roof tiles, swimming pools, masonry, etc.
An advantage of benzalkonium chloride not shared by ethanol-based antiseptics or hydrogen peroxide antiseptic is that benzalkonium chloride-based antiseptics do not cause a burning sensation when applied to broken skin.
Benzalkonium chloride is also used in many non-consumer processes and products, including as an active ingredient in surgical disinfection. A comprehensive list of uses includes industrial applications.
Benzalkonium chloride is a frequently used preservative in eye drops; typical concentrations range from 0.004% to 0.01%. Stronger concentrations can be caustic and cause irreversible damage to the corneal endothelium.
Benzalkonium chloride also possesses surfactant properties, dissolving the lipid phase of the tear film and increasing drug penetration, making it a useful excipient.
Although historically benzalkonium chloride has been ubiquitous as a preservative in ophthalmic preparations, its ocular toxicity and irritant properties, in conjunction with consumer demand, have led pharmaceutical companies to increase production of preservative-free preparations, or to replace benzalkonium chloride with preservatives which are less harmful.
Many mass-marketed inhaler and nasal spray formulations contain benzalkonium chloride as a preservative, despite substantial evidence that it can adversely affect ciliary motion, mucociliary transport, nasal mucosal histology, human neutrophil function, and leukocyte response to local inflammation.
Although some studies have found no correlation between use of benzalkonium chloride in concentrations at or below 0.1% in nasal sprays and drug-induced rhinitis, others have recommended that benzalkonium chloride in nasal sprays is avoided.
Benzalkonium chloride is irritant to middle ear tissues at typically used concentrations. Inner ear toxicity has been demonstrated.
Occupational exposure to benzalkonium chloride has been linked to the development of asthma.
In 2011, a large clinical trial designed to evaluate the efficacy of hand sanitizers based on different active ingredients in preventing virus transmission amongst schoolchildren was re-designed to exclude sanitizers based on benzalkonium chloride due to safety concerns.
Benzalkonium chloride has been in common use as a pharmaceutical preservative and antimicrobial since the 1940s. While early studies confirmed the corrosive and irritant properties of benzalkonium chloride, investigations into the adverse effects of, and disease states linked to, benzalkonium chloride have only surfaced during the past 30 years.
Benzalkonium chloride is classed as a Category III antiseptic active ingredient by the United States Food and Drug Administration. Ingredients are categorised as Category III when "available data are insufficient to classify as safe and effective, and further testing is required”. Benzalkonium chloride is excluded from the current United States Food and Drug Administration review of the safety and effectiveness of consumer antiseptics and topical antimicrobial over-the-counter drug products, meaning it will remain a Category III ingredient. There is acknowledgement that more data are required on its safety, efficacy and effectiveness, especially with relation to:
- Human pharmacokinetic studies, including information on its metabolites
- Studies on animal absorption, distribution, metabolism, and excretion
- Data to help define the effect of formulation on dermal absorption
- Studies on developmental and reproductive toxicology
- Potential hormonal effects
- Assessment of the potential for development of bacterial resistance
RTECS lists the following acute toxicity data:
|Organism||Route of Exposure||Dose (LD50)|
Benzalkonium chloride formulations for consumer use are dilute solutions. Concentrated solutions are toxic to humans, causing corrosion/irritation to the skin and mucosa, and death if taken internally in sufficient volumes. 0.1% is the maximum concentration of benzalkonium chloride that does not produce primary irritation on intact skin or act as a sensitizer.
Benzalkonium chloride should not be used in pediatric products.
Poisoning by benzalkonium chloride is recognised in the literature. A 2014 case study detailing the fatal ingestion of up to 240ml of 10% benzalkonium chloride in a 78 year-old male also includes a summary of the currently published case reports of benzalkonium chloride ingestion. While the majority of cases were caused by confusion about the contents of containers, one case cites incorrect pharmacy dilution of benzalkonium chloride as the cause of poisoning of two infants.
Benzalkonium chloride poisoning of domestic pets has been recognised as a result of direct contact with surfaces cleaned with disinfectants utilising benzalkonium chloride as an active ingredient.
The greatest biocidal activity is associated with the C12 dodecyl & C14 myristyl alkyl derivatives. The mechanism of bactericidal/microbicidal action is thought to be due to disruption of intermolecular interactions. This can cause dissociation of cellular membrane lipid bilayers, which compromises cellular permeability controls and induces leakage of cellular contents. Other biomolecular complexes within the bacterial cell can also undergo dissociation. Enzymes, which finely control a wide range of respiratory and metabolic cellular activities, are particularly susceptible to deactivation. Critical intermolecular interactions and tertiary structures in such highly specific biochemical systems can be readily disrupted by cationic surfactants.
Benzalkonium chloride solutions are fast-acting biocidal agents with a moderately long duration of action. They are active against bacteria and some viruses, fungi, and protozoa. Bacterial spores are considered to be resistant. Solutions are bacteriostatic or bactericidal according to their concentration. Gram-positive bacteria are generally more susceptible than gram-negative bacteria. Activity is not greatly affected by pH, but increases substantially at higher temperatures and prolonged exposure times.
In a 1998 study utilizing the FDA protocol, a non-alcohol sanitizer with benzalkonium chloride as the active ingredient met the FDA performance standards, while Purell, a popular alcohol-based sanitizer, did not. The study, which was undertaken and reported by a leading US developer, manufacturer and marketer of topical antimicrobial pharmaceuticals based on quaternary ammonium compounds, found that their own benzalkonium chloride-based sanitizer performed better than alcohol-based hand sanitizer after repeated use.
Advancements in the quality and efficacy of benzalkonium chloride in current non-alcohol hand sanitizers has addressed the CDC concerns regarding gram negative bacteria, with the leading products being equal if not more effective against gram negative, particularly New Delhi metallo-beta-lactamase 1 and other antibiotic resistant bacteria.
Newer formulations using benzalkonium blended with various quaternary ammonium derivatives can be used to extend the biocidal spectrum and enhance the efficacy of benzalkonium based disinfection products. Formulation techniques have been used to great effect in enhancing the virucidal activity of quaternary ammonium-based disinfectants such as Virucide 100 to typical healthcare infection hazards such as hepatitis and HIV. The use of appropriate excipients can also greatly enhance the spectrum, performance and detergency, and prevent deactivation under use conditions. Formulation can also help minimise deactivation of benzalkonium solutions in the presence of organic and inorganic contamination.
Benzalkonium chloride is readily soluble in ethanol and acetone. Although dissolution in water is slow, aqueous solutions are easier to handle and are preferred. Solutions should be neutral to slightly alkaline, with colour ranging from colourless to a pale yellow. Solutions foam profusely when shaken, have a bitter taste and a faint almond-like odour which is only detectable in concentrated solutions.
Standard concentrates are manufactured as 50% and 80% w/w solutions, and sold under trade names such as BC50, BC80, BAC50, BAC80, etc. The 50% solution is purely aqueous, while more concentrated solutions require incorporation of rheology modifiers (alcohols, polyethylene glycols, etc.) to prevent increases in viscosity or gel formation under low temperature conditions.
- Stearalkonium chloride
- Polyaminopropyl biguanide, an alternative preservative for contact lens solutions
- Ethylenediaminetetraacetic acid
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