Recent Technologies for the Extraction and Separation of Polyphenols in Different Plants: A Review

Polyphenol is an important secondary metabolite with unique physiological functions and biological activity. The polyphenols in different plants and biomass have different chemical structures, which needs various extraction methods to obtain them. Recently, plant polyphenols and their application research in food and medicine have become a research hotspot, which is mainly focused on preparation, purification, structural identification, and biological activity assays. Among these researches, extraction and separation are the key sections to investigate the structure and activity of polyphenol. Hence, this review summarized the recent extraction and separation techniques of polyphenol, including solvent extraction, supercritical fluid extraction, ultrasonic extraction, enzymatic extraction, resin adsorption extraction, and electric field method, etc. In addition, this review also reveals the current problems and proposes future extraction research of polyphenol. It is hoped that this review will provide a guide for the researchers who are actively committed to promoting progress in the field of polyphenolics.