[Examination of identification test of certain aromatic amines originating from azo colorants in textile and leather products using high performance liquid chromatography].

Azo colorants that generate primary aromatic amines (PAAs) have been recently deliberated as a controlled harmful substance by the "Act on the Control of Household Products Containing Harmful Substances" in Japan. Therefore, we examined an identification test for 22 kinds of PAAs originating from the azo colorants in commercial textile products and leather products using high performance liquid chromatography (HPLC). When a PAAs standard solution containing 2,4-xylidine and 2,6-xylidine was analyzed using the condition according to EN14362-1:2012 at 240 nm as a basic condition, we observed enough separation for all the PAAs to identify. However, in the some sample solutions, the peaks of several PAAs were overlapped with the interference peaks, and their identifications were difficult. In these cases, some PAAs were able to identify by alteration to suitable wavelength. Furthermore, the retention time of almost PAAs and interference peaks were changed by using acetonitrile as the organic solvent in eluent or phenyl type column. These modifications were helpful for identification of PAA which was overlapped to interference substances by the basic condition. Thus, we suggest the HPLC condition for an identification test is in accordance to that described in EN14362-1:2013. And we propose that the HPLC condition can be modified as necessary.