Khellin and Related Compound
Commercial and botanical isolates of khellin are assessed by validated chromatographic methods with typical finished material specifications targeting greater than 95 percent assay by HPLC. The principal related substances seen in extracts and isolates are the structurally related furanochromone visnagin, plus minor khellol-type reduction products and trace chromone derivatives; typical observed ranges when originating from botanical extraction are visnagin 0.5 to 3.0 percent relative to khellin, combined khellol and other reduced furanochromones 0.1 to 1.0 percent, and miscellaneous minor chromone-related impurities up to 1.0 percent, giving a usual total related substances window below 5.0 percent. Residual solvents and moisture are controlled to standard limits, commonly below 0.5 percent each, and identity and purity are confirmed by retention time matching, MS fragmentation pattern, and 1H and 13C NMR spectral data.
FAQ
Khellin has traditional uses as an antispasmodic, bronchodilator, and vasodilator and has been applied topically and systemically in folk medicine for conditions such as renal colic, kidney stones, coronary complaints, bronchial asthma, vitiligo, and psoriasis. In modern technical contexts it is used as a pharmacognostic marker, an investigational smooth muscle relaxant and photosensitizing agent for dermatologic research, and as a reference standard in analytical laboratories.
Khellin is a furanochromone consisting of a fused furan ring attached to a chromone core, with methoxy substituents on the aromatic portion and a carbonyl characteristic of the chromone nucleus. The molecule is a rigid, largely planar polycyclic system that is identifiable by its UV absorption profile and by diagnostic NMR signals for the methoxy groups, aromatic protons, and the carbonyl carbon.