Optimization of efficiently extracting procyanidins from Camellia oleifera shells by microwave-assisted deep eutectic solvent.

The procyanidins of Camellia oleifera shells were efficiently separated by using deep eutectic solvent and microwave-assisted extraction. The eutectic solvent made of choline chloride and oxalic acid system was selected as the extraction solvent. The effects of microwave power, raw material particle size, microwave temperature, microwave time, solvent water content and solid-liquid ratio on the extraction amount of procyanidins from Camellia oleifera shells were extensively studied, and the optimal extraction process parameters were further evaluated through orthogonal optimization experiments. When using the raw material with an average particle size of 53 µm and 5% water content of solvent, the optimum technological parameters could be as follow; the material liquid ratio of 1:20 (g/mL), microwave power of 600 W and microwave irradiation at 35 °C for 60 min. Under these optimized conditions, the extraction amount of procyanidins from Camellia oleifera shells can achieve to 66. 89 mg/g. [ABSTRACT FROM AUTHOR]