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Extraction of steviol glycosides from dried Stevia rebaudiana by pressurized hot water extraction
- Németh, Á., Jánosi, Sz.
- Acta alimentaria 2019 v.48 no.2 pp. 241-252
- Stevia rebaudiana, color, glycosides, leaf extracts, leaves, pressing, response surface methodology, solvents, spray drying, steviol, stevioside
- In existing processes, the extraction of steviol glycosides from stevia leaves involves many process steps often including extraction by organic solvents. The purpose of the present study was to develop a process for the effective extraction of steviol glycosides, which can provide a concentrated juice exhibiting a high level of recovery with regard to the target compounds, rebaudioside A and stevioside. Pressurized Hot Water Extraction (PHWE) was first optimized with Response Surface Methodology in terms of maximized rebaudioside-A yield and minimized colour components. PHWE was then combined with pressing in a wine-press, resulting higher efficiency for extracting both steviol glycosides in comparison to the reported methods in the literature. Finally, spray drying was applied for both product stabilization and removal of contaminants.