For melanin this mechanism has developed later in the course of evolution. Melanin is such an efficient photoprotective substance, because it dissipates more than 99.9% of the absorbed UV radiation as heat. This means that less than 0.1% of the excited melanin molecules will undergo harmful chemical reactions or produce free radicals.
|UV-absorber||other names||percentage of molecules that dissipate the photon energy (quantum yield: Φ )||molecules not dissipating the energy quickly|
|DNA||> 99.9 %||< 0.1 %|
|natural melanin||> 99.9 %||< 0.1 %|
|2-phenylbenzimidazole-5-sulfonic acid||PBSA, Eusolex 232, Parsol HS,|
|2-ethylhexyl 4-dimethylaminobenzoate||Padimate-O, oxtyldimethyl PABA, OD-PABA||0.1 = 10%||90%|
|4-Methylbenzylidene camphor||(4-MBC), (MBC), Parsol 5000, Eusolex 6300||0.3 = 30%||70%|
|4-tert-butyl-4-methoxydibenzoyl-methane||(BM-DBM), Avobenzone, Parsol 1789, Eusolex 9020|
|Menthyl Anthranilate||(MA), Methyl-2-aminobenzoate, meradimate||0.6 = 60%||40%|
|Ethylhexyl methoxycinnamate||(2-EHMC), (EHMC), EMC, Octyl methoxycinnamate, OMC, Eusolex 2292, Parsol||0.81 = 81%||19%|
Long-Term Ingestion of High Flavanol Cocoa Provides Photoprotection against UV-Induced Erythema and Improves Skin Condition in Women1
Jun 01, 2006; ABSTRACT Dietary antioxidants contribute to endogenous Photoprotection and are important for the maintenance of skin...
WIPO ASSIGNS PATENT TO YBIOS FOR "PHOTOPROTECTION COMPOSITIONS COMPRISING CYNARA SCOLYMUS AND ECHINACEA PURPUREA EXTRACTS" (BRAZILIAN INVENTORS)
Nov 29, 2010; GENEVA, Nov. 29 -- Publication No. WO/2010/132969 was published on Nov. 25. Title of the invention: "Photoprotection...