A STUDY OF SUBCRITICAL WATER AND ETHANOLIC EXTRACTS OF ROSEMARY LEAVES (ROSMARINUS OFFICINALIS L.) BY GC-MS
UDK 543.612.3
Abstract
Extraction of biologically active substances from the leaves of rosemary (Rosmarinus officinalis L.) is carried out by solutions of ethanol in water with 95, 70, 50, 10% ethanol concentration by maceration, as well as by boiling under reflux using hot water and subcritical water at the temperature 130, 150 °С and a pressure of 5±0.1 MPa in dynamic mode.
The extracts were analyzed by gas chromatography with mass spectrometric detection by direct injection, as well as after derivatization with N,O-bistrimethylsilyltrifluoroacetamide. About 100 components have been identified in rosemary leaf extracts, phenolic compounds and carboxylic acids are dominant. The main volatile organic compounds (VOCs) are terpenoids: α-terpineol, borneol, camphor, α-pinene, β-pinene, myrcene, aromatic compounds: p-vinyl guaiacol, cymene. The dominant non-volatile components of all extracts include phenolcarboxylic acids: rosmarinic acid, caffeic acid, benzoic acid, carboxylic acids: malonic acid, caproic acid, glutaric acid, palmitic acid, and carbohydrates: raffinose, D-mannopyranose, D-fructose. As the temperature of the dynamic water extraction process increases, the extraction efficiency of non-volatile components increases. In terms of the number of extracted compounds, the efficiency of extraction with subcritical water is comparable to extraction with 95% ethanol concentration by the maceration method.
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Rosmarinic acid, GC-MS. URL: https://pubchem.ncbi.nlm.nih.gov/compound/Rosmarinic-acid#section=GC-MS.
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