DEVELOPMENT OF METHODS OF STANDARDIZATION OF FLOWERS OF SPREADING MARIGOLD (TAGETES PATULA L.)

Abstract

The spreading marigold (Tagetes patula L.), the family Aster (Asteraceae), or Composite (Compositae), is a prospective source of flavonoids. The aim of the study is to develop methods of standardization of marigold flowers rejected, consisting in determining the identity of this raw material and the quantitative determination of biologically active compounds. As a result of a comparative chromatographic study, the presence of flavonoids was detected upon detection at a wavelength of 254 and 366 nm and before and after reaction with an alcohol solution of aluminum chloride. The presence of patuletin and patulitrin was confirmed in extracts of different varietal forms of Tagetes patula L.. Using column chromatography on silica gel L 40/100, two flavonoid substances were isolated patuletin (3,5,7,3′,4′-pentahydroxy-6-methoxyflavone) and patulitrin (7-O-β-D-glucopyranoside of 3,5,7,3',4′-pentahydroxy-6-methoxyflavone), which have been identified by UV-, 1H-NMR -, 13C-NMR-spectroscopy and mass spectrometry, as well as acid hydrolysis. In the solvent system chloroform- ethanol-water (26 : 16 : 3) Rf values of patuletin and patulitrin are about 0.7 and 0.4, respectively. It was found that patulitrin is the main flavonoid in the flowers of spreading marigold and determines the character of the absorption curve of the electronic spectra of water-alcohol extraction from this raw material. During the quantitative analysis of the total flavonoids in the flowers of spreading marigold, it is necessary to recalculate the content of active substances to the dominant and diagnostically significant flavonoid patulitrin. It was determined that the content of the total flavonoids in the studied samples of flowers of different varieties of the spreading marigold varies from 4.36±0.02% to 11.71±0.05% (calculated on patulitrin).