- Phenylbenzimidazole sulfonic acid
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ImageFile=Phenylbenzimidazole sulfonic acid.png
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IUPACName=2-phenyl-3H-benzimidazole-5-sulfonic acid
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Section1=Chembox Identifiers
CASNo=
PubChem= 33919
SMILES=C1=CC=C(C=C1)C2=NC3=C(N2)C=C(C=C3)S(=O)(=O)O
Section2=Chembox Properties
Formula=C13H10N2O3S
MolarMass=274.2951
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Section3=Chembox Hazards
ExternalMSDS = [http://www.coleparmer.com/catalog/Msds/28108.htm Cole Parmer Material Safety Data Sheet]
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Autoignition=Phenylbenzimidazole sulfonic acid (C13H10N2O3S) is a common
sunscreen agent. In 1999, theUnited States Food and Drug Administration regulated that the name ensulizole be used on sunscreen labels in theUnited States . Phenylbenzimidazole sulfonic acid is primarily aUVB protecting agent providing only minimalUVA protection. Its scope is 290 to 340 nanometers whereas the UVA range is 320 to 400 nanometers. [http://www.uspdqi.org/pubs/monographs/sunscreen_agents.pdf] For complete UVA protection, it must be paired withavobenzone ,titanium dioxide , orzinc oxide ; outside of the United States it can also be paired withTinosorb andMexoryl . Because phenylbenzimidazole sulfonic acid is water-soluble, it has the characteristic of feeling lighter on skin. As such, it is often used in sunscreen lotions or moisturizers whose aesthetic goal is a non-greasy finish. [ [http://www.emedicine.com/derm/topic510.htm eMedicine - Sunscreens and Photoprotection : Article by Stanley B Levy ] ] The free acid is poorly soluble in water, so it is only used as its soluble salts. [http://www.merck.de/servlet/PB/menu/1254590/index.html]References
External links
* [http://www.uspdqi.org/pubs/monographs/sunscreen_agents.pdf Thomson MICROMEDEX - Sunscreen Agents (Topical)]
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