Naslov
Pressurized hot water extraction (PHWE) for the green recovery of bioactive compounds and steviol glycosides from Stevia rebaudiana Bertoni leaves

Autori
Bursać Kovačević, Danijela ; Barba, Francisco J. ; Granato, Daniel ; Galanakis, Charis M. ; Herceg, Zoran ; Dragović-Uzelac, Verica ; Putnik, Predrag

Izvornik
Food chemistry (0308-8146) 254 (2018), 2018; 150-157

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Green extraction ; Total phenolics ; Condensed tannins ; Chlorophylls/carotenoids ; Stevioside/rebaudioside A

Sažetak
Stevia rebaudiana Bertoni leaves are a natural source of diterpenic glycosides, and various bioactive compounds. The objectives were to haracterize antioxidants and steviol glycosides in the extracts obtained from Stevia after “green” pressurized hot water extraction (PHWE). PHWE extracts were obtained at different temperatures (100, 130, 160 °C) ; static extraction times (5 and 10 min), and cycle numbers (1, 2, 3) using a constant pressure of 10.34 MPa. Temperature was the most important parameter for extraction, where the highest recoveries of all bioactive compounds (except for carotenoids) were at 160 °C. Extracts obtained at longer static times had more steviol glycosides, condensed tannins, and chlorophyll A. Higher amounts of total phenols, condensed tannins, and steviol glycosides were obtained under higher cycle numbers. This study indicated that PHWE is useful for recovering polar and nonpolar antioxidants and steviol glycosides. PHWE may be a suitable technique for scaleup to industrial applications.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA