Related Experiment Video
Updated: May 12, 2026

Preparation of Hard Palm Seeds for Matrix-Assisted Laser Desorption/Ionization-Imaging Mass Spectrometry Analysis
Published on: June 30, 2023
Chemical constituents derived from Drimys brasiliensis Miers (Winteraceae)
Murillo C Mecchi1, João Henrique G Lago
1a Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo , Diadema, SP , Brazil.
Abstract:
Phytochemical investigation on Drimys brasiliensis afforded the isolation and characterisation of four drimane sesquiterpenes: polygodial (1), warburganal (2), 1-β-(p-coumaroyloxy)polygodial (3) and 1-β-(p-methoxycinnamoyl)polygodial (4), as well as four flavonoids: quercitrin (5), astilbin (6), isoastilbin (7) and neoastilbin (8). The structures were elucidated on the basis of their spectral data and compared with those reported in the literature. Compounds 2, 5-8 have been reported to occur for the first time in D. brasiliensis, while compounds 5, 7 and 8 have been reported to occur for the first time in the genus Drimys. The chemotaxonomic significance of these compounds, mainly flavonoids 5-8 in D. brasiliensis, was summarised.
Related Concept Videos
Seed Structure and Early Development of the Sporophyte
The Bronchial Tree
The trachea, commonly known as the windpipe, is a tube that connects the larynx (voice box) to the bronchi. At a point called the carina, it bifurcates into two primary bronchi. The right primary bronchus is wider, shorter, and more vertical than the left primary...
Diels–Alder Reaction: Characteristics of Dienes
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Structure of Conjugated Dienes
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Plant Hormones
Adaptations that Reduce Water Loss
