A drop of acetic anhydride is placed on a leaf, heated from below by a small flame, and this liquid, in which the substance contained in the cuticle of a leaf has dissolved, is sucked into a capillary tube of ca. 1mm. diameter. Over this is placed a very small quantity of conc. H
2SO
4, by which a red coloration of Liebermann's reaction occurs if triterpenes exist in the leaf. By such a microchemicl method, the authors found the existence of a large amount of triterpenes in the cuticle of leaves in 120 species of plants. By these tests, following families were found to contain triterpenes in the leaf cuticle: Caprifoliaceae, Scrophulariaceae, Apocynaceae, Gentianaceae, Oleaceae, Pirolaceae, Ericaceae, Araliaceae, Cornaceae, Myrtaceae, Elaeagnaceae, Thymelaeaceae, Theaceae, Ulmae, Aquifoliaceae, Rosaceae, Trochodendraceae, Betulaceae.
抄録全体を表示