Elevated formaldehyde concentration in “Brazilian keratin type” hair-straightening products: A cross-sectional study - 16/01/14
Abstract |
Background |
Brazilian keratin treatment (BKT) and similar straightening products fix and retain a straight shape even when the hair is wet. Unacceptably high concentrations of formaldehyde have been reported in such products.
Objective |
We sought to measure the formaldehyde concentration in all BKT brands marketed in South Africa in 2012.
Methods |
We quantified formaldehyde by high-performance liquid chromatography with ultraviolet light detection after derivatization with dinitrophenylhydrazine. All components of 7 identified commercial brands were each tested 3 times.
Results |
The maximum safe concentration of formaldehyde set by the US Cosmetic Ingredient Review Expert Panel is less than 0.2%. Of the 7 commercial BKT brands, 6 had formaldehyde levels that ranged from 0.96% to 1.4%, ie, 5 times higher than the recommended level; these included 5 brands labeled formaldehyde-free.
Limitations |
The study is limited by not including all internationally available BKT products.
Conclusions |
Formaldehyde concentrations in BKT products may exceed recommended levels and serve as a health hazard. Industry monitoring is needed to improve compliance and protection of hairdressers and consumers.
Le texte complet de cet article est disponible en PDF.Key words : Brazilian keratin treatments, formaldehyde, hair, hairdressing, public health
Abbreviations used : BKT, DNPH, DNPHF, HPLC
Plan
| Supported by the National Research Foundation (South Africa). |
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| Conflicts of interest: None declared. |
Vol 70 - N° 2
P. 276-280 - février 2014 Retour au numéro
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