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Measurements of the photodegradation of PABA and some PABA derivatives
H Flindt-Hansen1, C J Nielsen, P Thune
1Department of Dermatology, Ullevaal Hospital, Oslo, Norway.
Abstract:
The photodegradation of 4-aminobenzoic acid, 2-ethylhexyl N,N-dimethyl 4-aminobenzoate (Escalol 507) and 1-glyceryl 4-aminobenzoate (Escalol 106), resulting from irradiation by sun lamps, was examined by UV spectroscopy. 2-ethylhexyl N,N-dimethyl 4-aminobenzoate showed the longest half-life, indicating the highest photostability.
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