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Hair colouring systems delivering colour with reduced fibre damage
Author(s) -
Marsh Jennifer M.,
Flood Janine,
Domaschko Dirk,
Ramji Niranjan
Publication year - 2008
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/j.1468-2494.2008.00421_2.x
Subject(s) - chemistry , ethylenediamine , hydrogen peroxide , hydroxyl radical , copper , metal , redox , photochemistry , polymer chemistry , inorganic chemistry , antioxidant , organic chemistry
The possible metal‐induced formation of free radical species such as the hydroxyl radical (HO*) during the use of permanent hair colouring products has been demonstrated. These highly reactive species are formed from the reaction of hydrogen peroxide with redox metals such as copper, which are thought to be absorbed by the hair from the tap wash water. Formation of such radical species has been shown to lead to measurable keratin fibre damage. The incorporation of chelants such as N , N ′ ‐ethylenediamine disuccinic acid has been demonstrated to prevent this metal‐induced radical formation and thus significantly reduce the fibre damage. This chelant is highly effective because of its ability to specifically bind low levels of copper in the presence of relatively high levels of calcium, as is found in hair.