Antioxidant phenylpropanoid glycosides from Buddleja davidii

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacology

Background:

• Buddleja davidii is a plant species known for its diverse phytochemical constituents.
• Phenylpropanoid glycosides are a class of natural compounds with potential biological activities.

Purpose of the Study:

• To isolate and characterize phenylpropanoid glycosides from Buddleja davidii.
• To evaluate the antioxidant activities of the isolated compounds.

Main Methods:

• Phytochemical investigation of the n-BuOH-soluble fraction of Buddleja davidii whole plant.
• Structure elucidation using 1D and 2D NMR spectroscopic techniques.
• In vitro antioxidant assays including hydroxyl radical, total reactive oxygen species (ROS), and peroxynitrite scavenging activity tests.

Main Results:

• Ten phenylpropanoid glycosides (1-10) were isolated and identified.
• All isolated compounds demonstrated potent antioxidant activity.
• Calceolarioside A (1) exhibited the strongest scavenging potential against hydroxyl radical (IC50: 4.15 µM), total ROS (IC50: 40.32 µM), and peroxynitrite (IC50: 2.26 µM).

Conclusions:

• Buddleja davidii is a valuable source of phenylpropanoid glycosides with significant antioxidant properties.
• The isolated compounds, particularly Calceolarioside A, show promise as natural antioxidants.
• Further research into the therapeutic potential of these compounds is warranted.