CHEMICAL ANALYSIS OF DENSE-GAS EXTRACTS FROM LIME FLOWERS

Demyanenko DV, Demyanenko VG, Dmitriyevsky DI
2015 Anali Mečnikìvsʹkogo Institutu  
The purpose of this work was to make qualitative and quantitative analysis of phenolic biologically active substances (BAS) in the extracts produced from lime flowers with condensed gases, using method of high-performance liquid chromatography (HPLC). Materials and methods: materials for this study were the extracts obtained by consequent processing of the herbal drug and marcs thereof with various condensed gases: difluorochloromethane (Freon R22), difluoromethane (Freon R32), azeotropic
more » ... ), azeotropic mixture of difluoromethane with pentafluoroethane (Freon 410A) and freon-ammonium mixture. Extracts obtained with the latter were subjected to further fractionation by liquidliquid separation into hexane, chloroform, ethyl acetate and aqueous-alcohol phases. Besides, the supercritical СО2 extract, obtained from the herbal drug under rather strong conditions (at temperature 60°С and pressure 400 bar), was studied in our previous research. Presence of phenolic BAS and their quantity in the researched samples were determined by method of HPLC with UVspectrometric detection. Results and discussion: It has been found that Freon R22 extracted trace amounts of rutin from lime flowers – its content was only 0.08% of the total extract weight. On the other hand, Freons R32 and R410А showed good selectivity to moderately polar BAS of lime flowers (derivatives of flavonoids and hydroxycinnamic acids): in particular, the extract obtained with freon R32 contained about 1.3% of the total phenolic substances, and it was the only one of the investigated condensed gases used by us which took the basic flavonoid of lime flowers tiliroside – its content was 0.42% of extract weight. Also Freons R32 and R410А were able to withdraw another compound dominating among phenolic substances in the yielded extracts. Its quantity was rather noticeable – up to 0.87% of extract weight. This substance was not identified by existing database, but its UV-spectrum was similar to those of apigenin glucoside. Total quantities of phenolic compounds in extracts obtaine [...]
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