PHYTOCHEMICAL STUDY OF TYPHA-DOMINGENESIS PERS (TYPHACEAE)

A general screening for secondary metabolites was performed on leaves of Typha domingensis Pers. Three coumarins, one flavanone and one flavone were isolated. The glycosidic sugars of the compounds were identified by thin layer chromatography

INFLUENCE OF TIME AND TEMPERATURE ON OIL FROM THE SEEDS OF 5 WOOD TREE SPECIES

In seeds of Alnus firmifolia Ferm. (Betulaceae), Abies religiosa (HBK) Schl. et Cham. (Pinaceae), Cedrela odorala L. (Meliaceae), Swietenia macrophylla King (Meliaceae) and Cordia eleagnoides DC (Boraginaceae) oil was analyzed, in order to observe the influence of 3-month storage of the seeds at room temperature and at 5 degrees C. During this period the amount of oil in the seeds (except in A. religiosa) decreased, slightly more in the samples stored at room temperature. The fatty acid composition of the oil was not altered by storage, except in Alnus firmifolia, where a decrease of linoleic acid and an increase of oleic acid was observed

THEVETOSIDE AND DIGITOXIGENIN, CARDENOLIDES FROM 2 SPECIES OF THEVETIA (APOCYNACEAE)

In a comparative analysis of the cardenolides of two Thevetia species, T. ovata Cav. and T thevetioides HBK, the amount of thevetoside in the seeds, and its acetate, was determined, as well as the yield of digitoxigenin obtained from these monoglycosides. T. thevetioides showed a higher concentration of thevetosides (2.81%) than T. ovata (1.06%), which resulted also in a higher yield of digitoxigenin (0.34 and 0.13%, respectively)

LOCALIZATION AND QUANTITY OF TANNINS AND PROTEINS IN THE TESTA OF IPOMOEA-PURPUREA (L) ROTH RELATIVE TO WATER PERMEABILITY

Localization and amount of condensed (not found) and hydrolyzable tannins and proteins in the testa of L purpurea were related to permeability to water in the testa. During dehydration of the seed, hydrolyzable tannins and prolamins decreased, albumins and globulins also decrease

chemical study on latex from euphorbia-tanquahuete sesse et moc (euphorbiaceae)

Latex samples of Euphorbia tanquahuete Sesse et Moc. (Euphorbiaceae), collected in the four moon phases, were analyzed to determine the composition of the secondary metabolites and to identify the main components. In the four samples studied only terpenes and steroids were found. The concentration of these compounds varies according to the collection time (moon phase). The major components of the acetonic extracts are lupeol and b-sitosterol