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Microwave-assisted extraction was optimised by the response surface methodology in order to enhance the extraction of polyphenols from Equisetum arvense (horsetail). Under the optimal conditions the total polyphenol content in extract reached a concentration of 161.57mg of gallic acid equivalents per g of extract dry matter. The optimal conditions were reached with 54.5% of ethanol, 45.1mL/g liquid/solid...
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