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A group of green solvent named polyols-based deep eutectic solvents (PDES) combined with microwave assisted extraction (MAE) was first successfully applied in extracting phenolic compounds from pyrola. A series of PDES with mixing different ratios choline chloride (ChCl) to different polyols were investigated for extraction, and ChCl/1,4-Butanediol (1/4) was found to be the suitable extraction solvent...
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