Nobiletin: efficient and large quantity isolation from orange peel extract

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Pharmacognosy

Background:

• Nobiletin exhibits significant anticancer, antiviral, and anti-inflammatory properties.
• Increased demand for high-purity, large-scale nobiletin necessitates improved isolation techniques.
• Conventional chromatography methods are insufficient for timely, gram-scale nobiletin purification.

Purpose of the Study:

• To develop an efficient and scalable method for isolating nobiletin from sweet orange peel.
• To address the limitations of existing purification techniques for nobiletin.

Main Methods:

• Silica gel flash column chromatography using an ethyl acetate and hexanes solvent system.
• Chiral chromatography on a Regis chiral column with ethanol and hexanes as eluents.
• Exploration of polymethoxyflavones from Citrus sinensis peel.

Main Results:

• A novel, efficient isolation method for nobiletin was successfully developed.
• Pure nobiletin was obtained in gram quantities within a single purification cycle.
• The method also allowed for the isolation of 5,6,7,4'-tetramethoxyflavone.

Conclusions:

• The developed method provides a scalable and efficient approach for obtaining high-purity nobiletin.
• This advancement facilitates the availability of nobiletin for research and potential therapeutic applications.
• The study highlights the potential of Citrus sinensis peel as a source for valuable polymethoxyflavones.