Optimization of the sonication extraction method of Hibiscus tiliaceus L. flowers |
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| Authors: | Melecchi Maria Inês Soares Péres Valéria Flores Dariva Cláudio Zini Claudia Alcaraz Abad Fernanda Contieri Martinez Migdália Miranda Caramão Elina Bastos |
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| Institution: | Chemistry Institute, UFRGS, Porto Alegre, RS, av. Bento Gon?alves, 9500, CEP 91501-960, RS, Brazil. |
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| Abstract: | The influence of several experimental parameters on the ultrasonic extraction of Hibiscus tiliaceus L. flowers were investigated: extraction time, solvent polarity, sample amount, solvent volume and sample particle size. It was concluded that the most influential variables were extraction time and solvent polarity. The optimized procedure employed 5 g of ground flowers, 150 mL of methanol and 140 min of extraction. The extracts were fractionated using preparative silica columns and the resulting fractions were analyzed by GC/MS. Some saturated hydrocarbons, fatty acids, fatty acid methyl esters, phytosterols, and vitamin E were identified in the plant extracts. |
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