“…Several papers focused on DESs-based extraction of polyphenols, especially flavonoids and phenolic acids from plants, such as Dictamnus albus, Foeniculum vulgare, Origanum majorana, mint, Salvia officinalis [20], Platycladi Cacumen [15], Sophora japonica [21], and others [4,5]. Duan et al [22] [23] investigated the extraction of protocatechuic acid, catechins, epicatechin and caffeic acid from Trachycarpus fortune using DESs as the extraction medium. In order to prepare the DESs, ChCl was mixed with ethylene glycol, glycerol, xylitol, phenol, formic acid, citric acid, oxalic acid and malonic acid.…”