276 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS •400.0 •00.0 Z:i•00.0 1•00.0 1•=00.0 11•00.0 1000.O I•iO. O0 '700. O0 •0.00 400.00 Figure 2. USP dimethicone standard spectrum, 0.001 g ß ml- •' ß •oo.o :mm.o i,,m.o iem.o inm.o I m'v• o ß Figure 3. Solvent-subtracted USP dimethicone standard spectrum, 0.001 g ß ml -•

DIMETHICONE QUANTITATION USING FTIR 277 .•r,•).o • o •.mo.o zeoo.o z2zm.o •oo.o •oo.o 1soo o •nnn.o •em.nn 'too nn ,•,.nn .mo.nn Figure 4. Blank formulation spectrum. 4F:•O. O 4000. O •4OD.O Z•(]O. O 2•0. O 1•]O.O IGOO.O 1•1)O,O 1000 .O I}SD .nn •I ]O. nn 5•). nn 4oo.nn • (l•rl.-I 1 Figure 5. Solvent-subtracted blank formulation spectrum.

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