Abstract
Supercritical fluid extraction was used to extract naphthoquinone pigments from Lithospermum erythrorhizon Sieb. et Zucc. The crude extracts were separated and purified by high-speed counter-current chromatography with light petroleum–ethyl acetate–methanol–water (5:5:8:2, v/v) as the two-phase solvent system. Three kinds of naphthoquinone pigments including 17.6 mg of β-hydroxyisovalerylshikonin (I), 17.6 mg of acetylshikonin (II), and 19.7 mg of isobutyrylshikonin (III) were obtained from 150 mg crude sample. The purity of these compounds was 96.7, 99.3 and 95.5%, respectively, as determined by liquid chromatograph. Their structures were identified by 1H NMR and 13C NMR.
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Feng, L., Ji, H., Gu, H. et al. An Efficient Method for Extraction, Separation and Purification of Naphthoquinone Pigments from Lithospermum erythrorhizon Sieb. et Zucc. by SFE and HSCCC. Chroma 70, 1197–1200 (2009). https://doi.org/10.1365/s10337-009-1283-9
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DOI: https://doi.org/10.1365/s10337-009-1283-9