期刊
FOOD CHEMISTRY
卷 295, 期 -, 页码 165-171出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.05.111
关键词
High voltage electrical discharges; Green extraction; Deep eutectic solvents; Aqueous glycerol; Polyphenols; Grapefruit peels
资金
- Lebanese National Council For Scientific Research (CNRS-L)
- Universite de Technologie de Compiegne, France
Deep eutectic solvents (DES) and aqueous glycerol were proposed as green alternatives to conventional solvents for the extraction of polyphenols from grapefruit peels. In order to increase the extraction kinetics and yields of polyphenols, high voltage electrical discharges (HVED) were used as a pre-treatment technology (energy varied between 7.27 and 218 kJ/kg). Results showed that the HVED energy input can be reduced, when the subsequent solid-liquid extraction was performed in 20% (w/v) aqueous glycerol or in DES (lactic acid: glucose) instead of water. The addition of glycerol has reduced the energy of the pre-treatment by 6 times. The same diffusivity of polyphenols (4x10(-11)m(2)/s) was obtained in water from HVED pre-treated peels at 218 kJ/kg and in aqueous glycerol from pre-treated peels at 36 kJ/kg. The solubility of naringin, the main flavonoid compound of grapefruit peels in the solvents, was investigated through a theoretical modelling of its Hansen solubility parameters.
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