Abstract (1) The properties and composition of the nigaki oil (a mixture of the shell and kernel oils) obtained from the whole fruit of “nigaki,” Picrasma quassioides Benn., have been examined. (2) As the chief constituent of the fatty acids of the oil, the occurrence of petroselinic acid, C18H34O2 (Δ6:7 octadecenoic acid), has been ascertained. (3) As the other constituent, palmitic acid has been identified from the saturated acids; lauric acid appears also to be present. Of the unsaturated acids, oleic, linolic, and linolenic acids are likely to be present. (4) The shell and kernel oils have also been examined separately. The former contains an appreciable proportion of saturated acids, while the latter has been found to contain petroselinic acid as the chief constituent.
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Tsujimoto et al. (1933) studied this question.