Science
Mechanism of Action
This compound exerts its broad-spectrum antimicrobial action by rapidly entering microbial cells. This uptake is largely facilitated by the lipophilic nature of the phenylmercuric cation. Once inside the cell, it broadly binds to vital cellular proteins, particularly those found in the cytoplasmic membrane and associated with ribosomes, thereby disrupting essential microbial functions.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Historically, concentrations ranging from 0.002% to 0.004% have been documented for its role as an antimicrobial preservative in ophthalmic pharmaceutical preparations, and at 0.002% in parenterals. Of note, a concentration of 0.04% in a hand disinfectant soap was associated with reported systemic mercury absorption following regular use.
Transparency
Dusting Analysis
Phenyl Mercuric Borate is largely banned or highly restricted for cosmetic use due to its significant mercury content and severe health and environmental risks. Consequently, the concept of 'dusting' to achieve an effect at low cosmetic concentrations is not applicable. The detection of any concentration in a cosmetic formulation should be considered a critical red flag, as systemic mercury absorption was reported at 0.04% in a hand disinfectant soap, indicating substantial hazard.
The Formula
Formulation
Stability
The compound demonstrates optimal stability within an acidic to neutral pH range of 5.0 to 7.0 at 20°C. It is susceptible to hydrolysis in aqueous environments. Solutions may be sterilized by autoclaving. Proper storage dictates a well-closed, light-protected container in a cool, dry place.
Conflicts
- halides
- anionic emulsifying agents
- suspending agents
- tragacanth
- starch
- talc
- sodium metabisulfite
- sodium thiosulfate
- disodium edetate (EDTA)
- silicates
- aluminum and other metals
- amino acids
- ammonia and ammonium salts
- sulfur compounds
- rubber
- some plastics
Safety
Safety Profile
Phenyl Mercuric Borate, an organomercury compound, is largely banned or highly restricted for use in cosmetics globally (e.g., in the UK) due to its high mercury content and the substantial health and environmental risks it poses. Safety data sheets classify it as fatal if inhaled, capable of causing organ damage through prolonged or repeated exposure, and very toxic to aquatic life with long-lasting effects. There is also a documented potential for cross-sensitization with other mercurial preservatives.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Due to its classification as an organomercury compound with significant toxicity, documented systemic absorption risks, and its status as largely banned or highly restricted for cosmetic applications, Phenyl Mercuric Borate should be strictly avoided in skincare formulations.
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References
Sources