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J Integr Plant Biol, 1975, 17 (1): -, Research Article
Study on the Key-Fruit Oils of Six Species of Ulmus
Fat and Oils Research Group, 4th Laboratory, Peking Institute of Botany, Academia Sinica
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Abstract
The oil contents, the oil characteristics and the compositions of the mixed fatty acids of the oils in the key-fruits of the six species belonging to Ulmus have been examined . Among these six species, four species (U. parvifolia Jacq., U. macrocarpa Hance, U. propinqua Koidz. and U. laciniata (Trautv.) Mayr.) are not recorded before. The present paper deals with the analytical results on key-fruit oils of the six species of Ulmus. The key-fruit samples of U. propinqua Koidz. and U. laciniata are obtained from Kirin. The key-fruit samples of U. pumila L., U. laevis Pall., U. parvifolia Jacq. and U. macrocarpa Itance are obtained respectively from Shantung, Sinkiang, Chekiang and Peking. U. pumila L., U. macrocarpa Hance, U. propinqua Koidz. and U. laciniata (Trautv.) Mayr. belong to Sect. Ulmus. U. parvifolia Jacq. and U. laevis Pall. belong respectively to Sect. Microptelea and Sect. Blepharocarpus. Although these elm trees belong to different sections in taxonomy and the analytical samples are obtained from various regions, their key-fruit oils have a relatively consistent character, that. is, the key-fruit oils are low in the iodine value and are high in the saponification value, the saturated fatty acids of the short chains occupy a large proportion, and the capric acid is a major fatty acid component which constitutes 44.8–66.5 per cent of the total fatty acids. It is made clear that this character appears to show the chemical character of the key-fruit oils of the various species of ulmus.
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