Figure 3: Identification <strong>of</strong> Lawson <strong>in</strong> sample 2-0345. HPLC chromatogram (A) and spectrum match (B) 19
Table 2: The contents <strong>of</strong> target precursors <strong>of</strong> <strong>oxidative</strong> <strong>hair</strong> <strong>dyes</strong> <strong>in</strong> the <strong>in</strong>vestigated products DMU No. MST No. Labell<strong>in</strong>g Identified Concentration %(m/m) 20 2-326 636 None <strong>of</strong> the target substances None <strong>of</strong> the target substances - 2-327 637 None <strong>of</strong> the target substances None <strong>of</strong> the target substances - 2-328 638 Toluene-2,5-diam<strong>in</strong>e Toluene-2,5-diam<strong>in</strong>e 1,1742 Resorc<strong>in</strong>ol Resorc<strong>in</strong>ol 0,1433 2-methylresorc<strong>in</strong>ol 2-methylresorc<strong>in</strong>ol 0,4330 2,7-naphthalenediol 3-am<strong>in</strong>ophenol* 2-am<strong>in</strong>o-3-hydroxypyrid<strong>in</strong>e* 2,7-naphthalenediol 0,0249 2-329 639 May conta<strong>in</strong> Toluene-2,5-diam<strong>in</strong>e Resorc<strong>in</strong>ol 4-chlororesorc<strong>in</strong>ol 2- naphthalenediol 2-methylresorc<strong>in</strong>ol 3-am<strong>in</strong>ophenol* 2-am<strong>in</strong>o-3-hydroxypyrid<strong>in</strong>e* 2-330 640 Toluene-2,5-diam<strong>in</strong>e Resorc<strong>in</strong>ol 2-methylresorc<strong>in</strong>ol 2-7-naphthaenediol 2-331 641 Toluene-2,5-diam<strong>in</strong>e Resorc<strong>in</strong>ol 2-methylresorc<strong>in</strong>ol 2,7-naphthalenediol Toluene-2,5-diam<strong>in</strong>e Resorc<strong>in</strong>ol 4-chlororesorc<strong>in</strong>ol Toluene-2,5-diam<strong>in</strong>e Resorc<strong>in</strong>ol 2-methylresorc<strong>in</strong>ol 2,7-naphthaenediol Toluene-2,5-diam<strong>in</strong>e Resorc<strong>in</strong>ol 2-methylresorc<strong>in</strong>ol 2,7-naphthalenediol 0,1286 0,0216 0,2241 Trace 0,2420 0,6923 0,833 2,0166 0,4625 0,1063 0,4645 Remarks * * 2,5-TDA could not be determ<strong>in</strong>ed due to <strong>in</strong>terference *HPLC peaks <strong>of</strong> and 3-am<strong>in</strong>ophenol and 2-am<strong>in</strong>o-3-hydroxypyrid<strong>in</strong>e overlap. Therefore, these substances can not be identified when both <strong>of</strong> these are present <strong>in</strong> a product