304 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 4 8 'lIME {minutes} Figure 9. HPLC-TEA chromatogram of N-nitrosodiethanolamine (NDELA) and N-nitrosodiisopropa- nolamine (NDIPA) on NH2-bonded phase with 3:97 (v/v) methanol-methylene chloride. Flow rate: 1 ml/min. (Reprinted with permission from reference 27. Copyright 1979 International Scientific Communi- cations, Inc.)
ANALYSIS OF NITROSAMINES 305 A , I I ! I 5 lO 5 10 TIME (minutes) 5 10 TIME (minutes) TIME (minutes) Figure 10. HPLC-TEA chromatograms of (i) standard N-nitrosodiethanolamine (NDELA) (ii) NDELA isolated from a cosmetic sample (NDELA peak arrowed) (A) on I-tBondapak-CN with 85:10:5 (v/v/v) hexane-methylene chloride-methanol. Flow rate: 2 ml/min (B) on I-tStyragel 50 nm with tetrahydrofuran. Flow rate: 1.5 ml/min (C) on •Porasil with 60:40 (v/v) hexane-acetone. Flow rate: 2 ml/min. (Reprinted with permission from reference 1. Copyright 1977 Pergamon Press.)
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