Riboflavin and its degradation product from Carthamus tinctorius / 中草药

ABSTRACT

Object To carry out a systematic study on the chemical constituents of Carthamus tinctorius L. In order to reveal pharmacological active compounds for their further development. Methods Three constituents were separated by macroporous resin, silica gel, polyamide, Sephadex LH-20 and spectral analysis. Results The structures were elucidated by spectroscopic means including 1D, 2D NMR and ESI-MS; they are 1-ribityl-2, 3-diketo-1, 2, 3, 4-tetrahydro-6, 7-dimethyl-quinoxaline (Ⅰ), riboflavin (Ⅱ), and uracil-ribofuranose (Ⅲ). Conclusion Compounds Ⅰ-Ⅲ are isolated from C. tinctorius for the first time. Compound Ⅱ is a very important coenzyme for our bodies. It has been found that compound Ⅰ has the property of lowering the blood pressure of anesthetized dogs when administered in travenously.