Structural Groups of Natural Phospholipids Taking Part in Complexation with Flavonoids

The parameters of the UV spectra of quercetin, dihydroquercetin, genistein, preparations of natural phospholipids (PLs), and mixtures of flavonoids with PLs in chloroform are determined by mathematical processing of these spectra using the Gauss method. It is shown that the position of the maximum of band II in the UV spectra of the studied flavonoids does not depend on the nature of the solvent, and the dependence of the optical density of bands II and I in solutions of these flavonoids on their concentration obeys the Bouguer–Lambert–Beer law. It is found that the parameters of the UV spectra of natural lipids significantly depend on the polarity of the solvent and the composition of PLs. Using genistein as an example, it is shown that the flavonoid interacts with the conjugated double bonds of fatty acids of PLs and nitrogen- and phosphorus-containing groups of PLs also participate in the formation of complexes.