Related Experiment Video
Updated: Aug 19, 2026

Extraction and Analysis of Taiwanese Green Propolis
Published on: January 7, 2019
Some chemical composition and biological activity of northern Argentine propolis
Maria I Isla1, Julio F Paredes-Guzman, M I Nieva-Moreno
1Department of Food Science, College of Food Engineering, State University of Campinas, P.O. Box 6177, 13083-970, Campinas, São Paulo, Brazil.
Abstract:
Twenty-five samples of propolis were collected from seven different regions in northern Argentina; ethanolic extracts of propolis were prepared from all samples, and the respective samples were examined for UV absorption spectra, RPHPTLC, RPHPLC, antimicrobial activity, antiradical activity, and total phenolic content. It was found that 16 of the 25 samples showed a phenolic profile similar to that found in samples from southern Brazil and corresponding to poplar-based propolis and that the rest of the samples showed a different profile and higher antimicrobial and antiradical activities.
Related Concept Videos
Local Anesthetics: Chemistry and Structure-Activity Relationship
Adrenergic Agonists: Chemistry and Structure-Activity Relationship
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
Local Anesthetics: Mechanism of Action
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship
