306 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS LIJ ! I I 6 12 18 TIME (minutes) Figure 11. HPLC-TEA chromatogram of N-nitrosomethyldodecylamine (NDOMA) and N-nitrosometh- yltetradecylamine (NMTDA) in a hair-care product on Lichrosorb Si-60 with 700:300:1 (v/v/v) chloro- form-cyclohexane-ethanol. Flow rate: 1 ml/min. (Reprinted with permission from reference 25. Copyright 1982 Pergamon Press.)
ANALYSIS OF NITROSAMINES 307 A B z 4 ATT.64 • ATT.32---• LU • ATT.64 • -ATT.32 0 3 6 9 0 3 6 9 TIME (minutes) TIME (minutes) Figure 12. HPLC-TEA chromatograms of N-nitrosodiethanolamine (NDELA) and N-nitrosodiisopro- pylamine (NDIPA) on IxPorasil with 35:65 (v/v) acetone-isooctane. Flow rate: 1.5 ml/min. A: in a shampoo product. B: standard NDELA (32.5 ppb) and NDIPA (45 ppb). (Reprinted with permission from reference 57. Copyright 1981 Pergamon Press.)
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