New triterpene isolated from Eschweilera longipes (Lecythidaceae).
نویسندگان
چکیده
The phytochemical studies of Eschweilera longipes Miers (Lecythidaceae) have led to the identification of a new triterpene 3beta, 24-dihydroxyfriedelane, the known 1beta, 2beta, 3beta, 19beta-tetrahydroxyurs-12-en-28-oic acid (1beta-hydroxyeucaphic acid) besides the saponin sitosterol 3betaO-betaD-glucopyranoside. The structures were established from the IR, NMR and mass spectra data including 2D NMR experiments of natural substances and of the acetyl derivative of the new triterpene.
منابع مشابه
Observations on the Phytogeography of the Lecythidaceae Clade (brazil Nut Family)
The Lecythidaceae clade of the order Ericales is distributed in Africa (including Madagascar), Asia in the broadest sense, and South and Central America. Distribution maps are included for the Lecythidaceae clade as follows: family maps for Napoleonaeaceae and Scytopetalaceae; subfamily maps for the Barringtonioideae, Foetidioideae, and Lecythidoideae, and maps for the subclades of Lecythidacea...
متن کاملTerrestrial foraging by Cacajao melanocephalus ouakary (primates) in Amazonian Brazil: is choice of seed patch size and position related to predation risk?
We analyse the behaviour of Cacajao melanocephalus ouakary feeding at patches of germinating seedlings in dried-out flooded forest. Seedlings of Eschweilera tenuifolia (Lecythidaceae) were the most commonly eaten (88.9%). Some seed patches were revisited over several days, while others were consistently ignored. We tested 3 predictions relating uacari terrestrial foraging behaviour to: (1) arbo...
متن کاملThe status of conservation of urban forests in eastern Amazonia.
This study aims to identify the remnant tree flora in six forest fragments in the metropolitan area of Belém and to analyze these fragments in terms of biological conservation, species richness and diversity in the local urban landscape. The fragments and their respective sampling areas were as follows: Amafrutas reserve (15 ha), Trambioca Is. reserve (2 ha), Bosque Rodrigues Alves city park (1...
متن کاملReport on a short study of the dry season feeding ecology and habitat preferences of the golden-backed uacari or bicó, Cacajao melanocephalus ouakary (Cebidae: Pitheciinae), on the lower Rio Jaú, Amazonas, Brazil
Golden-backed uacaris Cacajao melanocephalus ouakary were studied in the forests of Jaú National Park, Amazônas, Brazil, for 17 days in late October/early November 2000, the mid-dry season. Studies complimented our previous studies in the wet season of 1999 (Barnett et al., 2000). Eight uacari groups were seen and seven more were heard. Group sizes ranged from 1-100+. Uacaris were recorded in i...
متن کاملA New Taraxastane Triterpene from Euphorbia Denticulata with Cytotoxic Activity Against Prostate Cancer Cells
In this research, aerial parts of Euphorbia denticulata Lam were collected from Sanandaj city in Kurdistan province at the West of Iran. It was extracted by maceration using acetone as solvent. Isolation of compounds were carried out with repeated column chromatography using silica gel and normal preparative HPLC using YMC-Pack-Sil column and hexane: ethyl acetate as mobile phase. The structure...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Anais da Academia Brasileira de Ciencias
دوره 75 1 شماره
صفحات -
تاریخ انتشار 2003