$18 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table I Methyl Ricinoleate Content of Some Commercial Lipsticks as Determined by Glc Methyl Ricinoleate Found Lipstick No. Lipstick (mg) mg I 239.7 82.6 34.5 241.2 84.6 35.1 Av 35 II 265.1 151.2 57.0 229.4 129.2 56.3 Av 57 III 219.9 86.3 39.2 255.1 97.1 38.1 Av 39 IV 221.5 141.5 63.9 297.9 191.0 64.1 Av 64 V 173.6 101.3 58.4 215.9 122.9 56.9 Av 58 VI 237.2 105.8 44.6 246.2 110.0 44.7 Av 45 Table II Recoveries of Methyl Ricinoleate Added as Castor Oil (117.8 mg) to Commercial Lipsticks Methyl Ricinoleate Recovered" Lipstick No. Lipstick (mg) mg I 338.9 225.6 100 245.9 190.1 98 II 212.2 223.2 96 196.4 211.9 94 III 237.9 196.3 97 274.1 212.1 99 IV 206.5 238.1 99 199.4 233.6 99 V 232.0 237.6 97 204.9 223.7 98 VI 260.0 222.8 99 229.2 206.9 97 • Average recovery of methyl ricinoleate for two castor oil aliquots (117.8 rag) was 106.7 rag. The methyl ricinoleate content for each lipstick sample was calculated by using the data from Table I. This figure was subtracted from the methyl ricinoleate recovered (mg). A remainder of 106.7 mg was considered equivalent to 100.0 % recovery.

CHROMATOGRAPHY OF CASTOR OIL IN LIPSTICK 319 The difference between the molecular weight o[ ricinoleic acid tri- glyceride and the sum of the weights o[ 3 moles of methyl ricinoleate is only 0.4%. Thus, the amount o[ methyl ricinoleate recovered can be considered equivalent to the ricinoleic acid glyceride content of castor oil calculated as a triglyceride. A good estimate of ,the castor oil con- tent of a lipstick can be obtained by dividing the methyl ricinoleate con- tent by a [actor of 0.9. Based on such c,alculations, the amount o[ castor oil in the six lipsticks analyzed ranges f•om 39 to 71%. (Received November 29, 1971) REFERENCES (1) The Merck Index, 7th Ed, Merck & Co., Inc., Rahway, N.J., 1960, p. 219. (2) The Merck Index, 8th Ed., Merck & Co., Inc., R. ahway, N.J., 1968, p. 217. (3) Kirk-Othmer Encyclopedia o/ Chemical Technology, 2nd Ed., Vol. 4, John Wiley ge Sons, Inc., New York, N.Y., 1964, pp. 524•5. (4) Official Methods o/ Analysis, 10th Ed., 1965, Association of Official Amtlytical Chemists, Washington, D.C., Section 26.052.