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October 1970

Aminobenzoic Acid and Its EstersThe Quest for More Effective Sunscreens

Author Affiliations


From the Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia. Dr. Willis is currently with the Letterman Army Institute of Research, San Francisco.

Arch Dermatol. 1970;102(4):405-417. doi:10.1001/archderm.1970.04000100053012

The sunscreening efficacy of aminobenzoic acid and two of its best known esters was appraised on human subjects using solar-simulating radiation from the xenon lamp. Protection was measured in terms of the protective index, the ratio of the highest nonerythemogenic dose on the treated area to the minimal erythemal dose determined on a nearby untreated site.