Quality of Permanent Hair Dye Products in Thailand between 2012 – 2013

Abstract

       Between 2012 – 2013, the quality of totally 237 samples of 74 brands of permanent hair dyes products were surveyed. The samples could be divided into two groups following different objectives. The first group is 113 samples of 56 brands which comprised 71 samples 37 brands of locally manufactured and 42 samples of 19 brands of products from abroad. The first group is for identification of 3 prohibited hair dyes i.e. m-Phenylenediamine (mPDA), o-Phenylenediamine (oPDA) and o-Aminophenol (oAP). The second group is 124 samples of 59 brands which comprised 77 samples of 31 brands of locally manufactured and 47 samples of 28 brands of products from abroad. The second group is for quantification of 3 hair dye of restricted use i.e. p-phenylenediamine (pPDA), resorcinol (RES) and toluene-2,5-diamine (pTDA). Thin layer chromatography (TLC) and High performance liquid chromatography (HPLC) were used to identify, confirm and quantitative analysis of hair dye. The results showed that prohibited hair dye i.e. mPDA and oAP were detected in 4 imported permanent hair dyes from China and Korea (3.5%). It was found that 52 samples (41.9%) were not conformed to the Notification of the Ministry of public health. It is due to the found amount of restricted used - hair dyes are lower, higher, higher and/or lower than the acceptable criteria for the deviation from the labeling and the found hair dye is not a kind of the list on the label for 28, 15, 3 and 6 samples or 22.6%, 12.1%, 2.4% and 4.8 %, respectively. The concentration of hair dyes were found in the range of 0.02 - 12.98% w/w. Therefore, the laboratory’s capacity should be developed to support the law’s requirements in order to support in monitoring the safety of consumer products, accordingly.