the extraction of a secondary metabolite of type phenolic compound is traditionally by a solvent. however, the transfer material is affected by the cell wall of plants.to overcome this difficulty, several solutions have been proposed: pretreatment, such as the reduction of the size of the particles by grinding or by improvements in the conventional method of solvent extraction, such as the use of ultrasound, we have... in the present work udiu00e9e.our method is to deal with the plant material by sonication followed by maceration in a water bath shaker in order to maximize the extraction of monomeric anthocyanins from leaves of grenache noir (vitis vinifera l.) in two solvents ethanol and acid sulfureu x. we have opted for the approach of plant experience.technical parameters of us and us which have been studied (the concentration of solvent, time of sonication and the ph of the solvent. the comparison of the two techniques revealed an improvement in the response to our method.indeed, we found that our method gives consistently extracted concentrations of monomeric anthocyanins in excess of what has been achieved with the integration of the two solvents ethanol maceration and sulfur dioxide. this is variable in the operating conditions.
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