Qualitative and quantitative chromatographic investigation of hydroquinone derivatives in Pyrus communis L. flowers.

The qualitative analysis and quantitative determination of hydroquinone derivatives (arbutin, pyroside) in the flowers of naturally growing pear tree and of its four cultivated varieties (Pomarańczówka, Lukasówka, Klapsa, Salisbury) were carried out. The comparative qualitative analysis of hydroquinone derivatives was investigated chromatographically (TLC). Arbutin and pyroside were found in all the studied plant materials and free hydroquinone was found in buds of naturally growing pear. The content of arbutin and pyroside was determined by the HPLC method.