ESSENTIAL OILS AND THEIR CONSTITUENTS. XXV. 165 Figure 5. Thin layer chromatogram of essential oils of: a. Palmarosa b. Gingergrass. Sample volume: IX. Develop- ing solvent: Benzene-methanol (10:1). Chromatoplate heated for • minutes at 10•øC after spraying
166 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS METHYLISOEUGENOL •' ':•':"':' "'" ?:'""•':' PUERTO RICO • . '..• _•' :. :•-. ,' '37:• • •.. '" Figure G. Thin layer chromatogram of Citronella oils: a. Ceylon' b. Java c. Taiwan d. Honduras e. Dominican Republic f. Guatemala g. Mexico h. Puerto Rico. Sample volume: 0.•X. Developing solvent: Benzene genuine products from Java. Chromatograms of genuine oils of citronella Ceylon, however, all exhibited a characteristic pink spot (R• 0.61 reference: citronellal). It was found to be generated by methyl isoeugenol, whose presence in these preparations has been reported (5). The addition of 10% of the oil to oil of citronella Java can thus easily be detected.
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