HYDROTHERMAL EXTRACTION OF PHYTOCHEMICAL COMPOUNDS FROM Polygonum cuspidatum ROOTS IN A SEMI- BATCH REACTOR SYSTEM

Hydrothermal extraction is known as a natural and green way for antioxidant compounds extraction. Antioxidant compounds from the roots of traditional Chinese medicinal herb Polygonum cuspidatum (P. cuspidatum) has been extracted at hydrothermal conditions. The antioxidant compounds were identified as polyphenolic compounds of resveratrol, rutin and quercetin. The effect of temperatures on the extraction yield of antioxidant compounds was studied. Based on the result, extraction yields of resveratrol, quercetin, and rutin significantly increased with increasing temperature at 10 MPa. After 180 min of extraction time, the yields of resveratrol, quercetin, and rutin were 0.95, 0.26, and 6.73 mg/g of feed loaded at 473 K, respectively. These results revealed that hydrothermal extraction is applicable method for the isolation of polyphenolic compounds from other types of biomass and may lead to an advanced plant biomass components extraction technology.