THE SUNBURN-PROTECTING EFFECT OF PARA-AMINOBENZOIC ACID

[摘要] p-Aminobenzoic acid protects against the sunburn range of u.-v. light It is non-irritating, non-soiling and relatively stable under solar radiation. The expts. were made with 15% p-aminobenzoic in Ruggles'' cream. When symmetrical areas on the surface of the skin of the same person were covered in 0.03 mm. layer thickness with Ruggles'' cream and with 15% p-aminobenzoic acid in Ruggles'' cream respectively, the areas protected with the p-aminobenzoic acid ointment required 50 to 100 times longer irradiations to produce a threshold erythema than areas protected with the plain vehicle.