Related Experiment Video
Updated: Jul 17, 2026

Screening and Isolation of C-Glycoside-Cleaving Intestinal Bacteria
Published on: February 28, 2025
Novel Galloylhamameloses from Hamamelis virginiana1
1Institüt für Pharmazeutische Biologie, Freie Universität Berlin, D-14195 Berlin, Federal Republic of Germany.
Abstract:
The range of natural galloylhamameloses is extended by the recognition of the highly unstable novel analogues, the 1- O-(4-hydroxybenzoyl)-2',5-di- O-galloyl-alpha- D-hamamelofuranose and its 1- O-beta-anomer. The observed facile elimination of the C-1 acyl moiety is discussed and a mechanism proposed. These compounds are accompanied in the bark of HAMAMELIS VIRGINIANA by the "conventional" hamamelitannin, the related new 1,2',5-tri- O-galloyl-alpha- D-hamamelofuranose, and a tentatively characterized di- O-galloyl- D-hamamelopyranose, the first pyranose analogue, shown to be also present in commercially available hamamelitannin. The structures of these compounds were established from spectroscopic evidence of their acetate derivatives.
Related Concept Videos
Hyperosmolar Hyperglycemic State
Aldehydes and Ketones with Alcohols: Hemiacetal Formation
Outcomes of Glycolysis
Cellular respiration can occur aerobically (with oxygen) or anaerobically (without oxygen). In the presence of oxygen, cellular respiration starts with glycolysis and continues with pyruvate oxidation, the...
What is Glycolysis?
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors
Acarbose and miglitol are typically...
Membrane Carbohydrates
Membrane carbohydrates do not have any hydrophobic region and are exclusively located on the cell's outer surface. The addition of sugar molecules or glycosylation of proteins happens in...

