Methods of Betulin Extraction from Birch Bark

Area of Science:

• Natural Products Chemistry
• Pharmacognosy
• Biotechnology

Background:

• Betulin, a lupan series triterpenoid, possesses significant pharmacological properties including antibacterial, antiviral, and antitumor activities.
• The demand for betulin in medicine, pharmacology, and veterinary fields necessitates efficient extraction methods from industrial byproducts like birch bark.

Purpose of the Study:

• To review and compare various methods for the isolation and purification of betulin from birch bark.
• To assess the feasibility of large-scale betulin production from woodworking industry waste.

Main Methods:

• Vacuum sublimation following alkaline pretreatment.
• Vacuum pyrolysis.
• Supercritical fluid extraction using carbon dioxide or CO2-solvent mixtures.
• Organic solvent extraction.
• Microwave-assisted extraction, including novel application to Kyrgyz birch (Betula kirghisorum).

Main Results:

• The review details multiple betulin isolation techniques, outlining their respective advantages and disadvantages.
• The study highlights the potential of utilizing waste streams from the woodworking industry for betulin sourcing.
• The application of microwave-assisted extraction to the understudied Kyrgyz birch species is presented.

Conclusions:

• Effective and scalable methods for betulin isolation are essential for its broader application in various industries.
• Further research into novel extraction techniques, such as microwave-assisted methods, can optimize betulin yield and purity.
• Exploring underutilized botanical resources like Kyrgyz birch offers new avenues for betulin production.