Withanolides from hyoscyamus niger seeds

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Organic Chemistry

Background:

• Hyoscyamus niger (henbane) is a plant species known for its medicinal properties.
• The seeds of H. niger are a potential source of bioactive secondary metabolites.
• Withanolides are a class of C21 steroidal lactones with diverse biological activities.

Purpose of the Study:

• To isolate and characterize withanolide class steroids from the seeds of Hyoscyamus niger.
• To identify known and discover new compounds within this class.

Main Methods:

• Phytochemical investigation of Hyoscyamus niger seeds.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation using spectroscopic methods (NMR, MS) and X-ray crystallography.

Main Results:

• Three withanolide steroids were successfully isolated from the seeds.
• Two known compounds were identified: daturalactone-4 (1) and hyoscyamilactol (2).
• A novel compound, 16alpha-acetoxyhyoscyamilactol (3), was elucidated and characterized.

Conclusions:

• The seeds of Hyoscyamus niger contain a rich source of withanolide steroids.
• The discovery of 16alpha-acetoxyhyoscyamilactol expands the known diversity of withanolides.
• This study contributes to the understanding of the chemical constituents of Hyoscyamus niger.