The aim of this examination was optimization of flavonols’ detection method in plant’s extracts. In the first stage of the research the analysis of standard aglycones mixture stability in different hydrolysis conditions was performed. It was shown, among others, that most of the flavonols aglycones presented high durability during heating with acid. Moreover, the significant impact of acidity of environment of the reaction (acid’s kind and concentration) on the height and surface area of analyzed compounds was observed. These facts indicate the necessity of using in quantitative analysis solutions of standards of pH similar to pH of analyzed hydrolyzates. Also the possibility of obtaining incorrect results while using sulfuric acid as hydrolytic medium of the examined extracts was shown.
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