Extraction of stevia glycosides with CO2 + water, CO2 + ethanol, and CO2 + water + ethanol
AUTOR(ES)
Pasquel, A., Meireles, M.A.A., Marques, M.O.M., Petenate, A.J.
FONTE
Brazilian Journal of Chemical Engineering
DATA DE PUBLICAÇÃO
2000-09
RESUMO
Stevia leaves are an important source of natural sugar substitute. There are some restrictions on the use of stevia extract because of its distinctive aftertaste. Some authors attribute this to soluble material other than the stevia glycosides, even though it is well known that stevia glycosides have to some extent a bitter taste. Therefore, the purpose of this work was to develop a process to obtain stevia extract of a better quality. The proposed process includes two steps: i) Pretreatment of the leaves by SCFE; ii) Extraction of the stevia glycosides by SCFE using CO2 as solvent and water and/or ethanol as cosolvent. The mean total yield for SCFE pretreatment was 3.0%. The yields for SCFE with cosolvent of stevia glycosides were below 0.50%, except at 120 bar, 16°C, and 9.5% (molar) of water. Under this condition, total yield was 3.4%. The quality of the glycosidic fraction with respect to its capacity as sweetener was better for the SCFE extract as compared to extract obtained by the conventional process. The overall extraction curves were well described by the Lack extended model.
Documentos Relacionados
- Estudo da cinetica de extração dos glicosideos da Stevia rebaudiana Bertoni com mistura CO2 + agua
- Obtenção de extratos vegetais com propriedades funcionais via tecnologia supercritica : uso de CO2 e CO2 + H2O.
- Extraction of garlic with supercritical CO2 and conventional organic solvents
- Effect of Drinking on Adiponectin in Healthy Men and Women: A randomized intervention study of water, ethanol, red wine, and beer with or without alcohol
- Turbo-extraction of glycosides from Stevia rebaudiana using a fractional factorial design