JOURNAL OF COSMETIC SCIENCE 330 during the extraction process effectively prevented the deterioration of dye intermediates and increased the recovery. Good separation of 13 dye intermediates was achieved within 25 min using acetonitrile–citric acid mobile phase system (pH 2.6) with sodium 1-octanesulfonate as an ion-pair reagent. The good linearity, high recovery, excellent sen- sitivity, and precision recommended the use of the proposed methodology for the quanti- fi cation of dye intermediates in all commercially availab le hair dye products. ACKNOWLEDGMENT This work was fi nancially supported by Sci-tech Foundation of Xiamen Entry-Exit In- spection and Quarantine Bureau (NO. 2007XK03). REFERENCES (1) L. S. Cook, K. E. Malone, J. R. Daling, L. F. Voigt, and N. S. Weiss, Hair product use and the risk of breast cancer in young women, Cancer Causes Control, 10, 551–559 (1999). (2) M. Gago-Dominguez, J. E. Castelao, J. M. Yuan, M. C. Yu, and R. K. Ross, Use of permanent hair dyes and bladder-cancer Risk, Int. J. Cancer, 91, 575–579 (2001). (3) A. Perdith, Analytik kosmetischer Farbstoffe, Fresenius Z. Anal. Chem., 260, 278–283 (1972). (4) A. M. Söberg and C. Olkkonen, Determinat ion of synthetic organic colours in lipsticks by thin-layer and high-performance liquid chromatography, J. Chromatogr. A, 318, 149–154 (1985). (5) B. Schultz, Determination of 4-aminophenol in water by high-performance liquid chromatography with fl uorescence detection, J. Chromatogr. A, 299, 484–486 (1984). (6) S. C. Rastogi, A method for the analysis of intermediates of oxidative hair dyes in cosmetic products, J. Sep. Sci., 24, 173–178 (2001). (7) U. Vincent, G. Bordin, and A. R. Rodri’guez, Validation of an analytical procedure for the determina- tion of oxidative hair dyes in cosmetic formulations, J. Cosmet. Sci., 53, 43–58 (2002). (8) A. P. Natalia and N. N. Pavel, Simultaneous determination of dihydroxybenzenes, aminophenols and phenylenediamines in hair dyes by high-performance liquid chromatography on hypercross-linked polystyrene, Analyst, 125, 1249–1254 (2000). (9) V. Andrisano, R. Gotti, P. Roveri, and V. Cavrini, Analysis of semipermanent hair dyes by HPLC with on-line post-column photochemical derivatisation, Chromatographia, 44, 431–437 (1997). (10) B. H. Shao, X. Z. Xu, J. W. Yan, and X. Y. Fu, Quantitative determination of commercial oxidation hair dyes by reversed-phase HPLC, J. Liq. Chromatogr. R. T., 24, 241–249 (2001). (11) H. J. Zhu, Y. W. Yang, W. Q. Zhang, and Y. Zhu, Determination of 22 components in hair dyes by high performance liquid chromatography, Chin. J. Chromatogr. A, 26, 554–558 (2008). (12) P. Dobberstein, E. Korte, G. Meyerhoff, and R. Pesch, Investigation of an LC/MS interface for EI-, CI- and FAB-ionization, Int. J. Mass Spectrom. Ion Process., 46, 185–188 (1983). (13) E. J. Nanni, M. E. Lovette, R. D. Hicks, K. W. Fowler, and M. F. Borgerding, Separation and quantita- tion of phenolic compounds in mainstream cigarette smoke by capillary gas chromatography with mass spectrometry in the selected-ion mode, J. Chromatogr. A, 505, 365–374 (1990). (14) M. L. Di Gioia, A. Leggio, A. Le Pera, A. Liguori, A. Napoli, F. Perri, and C. Siciliano, Determina- tion by gas chromatography/mass spectrometry of p-phenylenediamine in hair dyes after conver- sion to an imine derivative, J. Chromatogr. A, 1066, 143–148 (2005). (15) N. Tanada, S. Kashimura, M. Kageura, and K. Hara, Practical GC/MS analysis of oxidation dye components in hair fi ber as a forensic investigative procedure, J. Forensic Sci., 44, 292–296 (1999). (16) R. M. Facino, M. Carini, G. Aldini, C. Marinello, P. Traldi, and R. Seraglia, Analysis of cosmetic prod- ucts by gas chromatography mass spectrometry and fast-atom bombardment mass spectrometry: When a combined approach is successful, Rapid Commun. Mass Spectrom., 11, 1329–1334 (1997). (17) S. Fanali, Host-guest complexation in capillary isotachophoresis: II. Determination of aminophe- nol and diaminobenzene isomers in permanent hair colorants by using capillary isotachophoresis, J. Chromatogr. A, 470, 123–129 (1989).

DETERMINATION OF 13 COMPONENTS IN OXIDATIVE HAIR DYES 331 (18) C. Sainthorant, Ph. Morin, M. Dreux, A. Baudry, and N. Goetz, Separation of phenylenediamine, phenol and aminophenol derivatives by micellar electrokinetic chromatography comparison of the role of anionic and cationic surfactants, J. Chromatogr. A, 717, 167–179 (1995). (19) C. E. Lin, Y. T. Chen, and T. Z. Wang, Separation of benzenediamines, benzenediols and aminophenols in oxidative hair dyes by micellar electrokinetic chromatography using cationic surfactants, J. Chro- matogr. A, 837, 241–252 (1999). (20) ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results – Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method.