Naslov
Electrotechnologies, microwaves, and ultrasounds combined with binary mixtures of ethanol and water to extract steviol glycosides and antioxidant compounds from Stevia rebaudiana leaves

Autori
Carbonell-Capella, Juana M. ; Šic Žlabur, Jana ; Rimac Brnčić, Suzana ; Barba, Francisco J. ; Grimi, Nabil ; Koubaa, Mohamed ; Brnčić, Mladen ; Vorobiev, Eugene

Izvornik
Journal of food processing and preservation (0145-8892) 41 (2017), 5; E13179, 8

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

Ključne riječi
high voltage electrical discharges ; microwaves ; pulsed electric fields ; stevia rebaudiana Bertoni ; ultrasounds

Sažetak
The aim of this work was to investigate the potential use of non-conventional technologies (microwaves, ultrasounds, pulsed electric fields, and high voltage electrical discharges) to enhance the extraction of high-added value compounds (mainly stevioside and rebaudioside A), and antioxidants(total phenolic compounds, flavonoids, chlorophylls, and carotenoids), from Stevia rebaudiana leaves. After treatment at equivalent energy, a supplementary diffusion was performed until 1 h. Results demonstrated that when water (100%) was used as solvent, the maximum recovery of stevioside (50.8±0.1 mg/g) was obtained after ultrasound-assisted extraction, while microwave allowed the highest yields of rebaudioside A (22.7±0.1 mg/g). However, pulsed electric field technology was the most efficient to recover stevioside (44.2±0.1 mg/g) and rebaudioside A (22.4±0.3 mg/g) when using 50% ethanol-water. Results obtained through this work pave the way toward the possible scaling-up of some of these non- conventional technologies for a multistep selective extraction of valuable compounds from Stevia leaves.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA