JOURNAL OF COSMETIC SCIENCE 274 Figure 8. 1 HNMR spectra of DMAE at 25°C (A), 40°C (B), and 60°C (C). INFRARED SPECTROSCOPY We used IR spectroscopy to look for possible structural changes in DMAE and DMAE bitartrate after storage at different temperatures. Figures 6 and 7 show the positions of

DMAE AND DMAE BITARTRATE IN COSMETICS 275 Figure 9. 1 HNMR spectra of DMAE bitartrate at 25°C (A), 40°C (B), and 60°C (C). the main vibrational modes determined by analysis of the bands recorded from the samples. The IR spectrum for DMAE (Figure 6) was characterized by a large, intense band at 3368.31 cm−1 (O–H stretch) and by a series of absorbance bands between 2947

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