Pressurized hot water extraction of bioactives

Abstract

In the last years, the fact that water is a "green" solvent capable of tunable their properties by changing temperature has tended to increase publications using pressurized hot water extraction (PHWE) as a "green" extraction technique. PHWE has been established as a special extraction technique employed in obtaining bioactive compounds such as polyphenols, diterpenes and polysaccharides, among others from natural sources. Therefore, the main goal of this review is to provide the reader with a brief description of PHWE fundamentals, an up-to-date overview on the use of PHWE to recover bioactive compounds (2015-present), following our previous work by Plaza and Turner (Trends in Analytical Chemistry 71 (2015) 39-57). The last and future trends in PHWE are presented such as its combination with ionic liquids or deep eutectic solvents as well as its coupling with drying steps in order to get higher extraction yields and dried particle formation from extracts, respectively. (C) 2019 Published by Elsevier B.V.