期刊
APPLIED SCIENCES-BASEL
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/app12020831
关键词
deep eutectic solvents; extraction; polyphenols; olive leaves
In this study, the extraction of phenolic compounds from olive leaves was optimized using three glycerol-based deep eutectic solvents (DESs) with lysine, proline, and arginine. The results showed that glycerol-lysine DES exhibited the best extraction performance. The content of tyrosol was high in the extracts, and a linear relationship between tyrosol content and total phenolic content was observed.
The extraction of phenolic compounds from olive leaves was optimized using three glycerol-based deep eutectic solvents (DESs) with lysine, proline, and arginine. A three-level Box-Behnken design was used to examine the influence of the liquid/solid ratio, concentration of DESs, and extraction temperature on the yield of the extraction process. A second-order polynomial model was used for predicting the polyphenol extraction yield. The optimal predicted conditions were used for extractions and they provided the highest total phenol yields with the glycerol-lysine exhibiting the best performance. Quantification of tyrosol, hydroxytyrosol, oleuropein, luteolin-7-O-glucoside, and rutin in the extracts showed high content in tyrosol in all DESs, particularly with glycerol-lysine and relatively similar contents with other studies for the other phenolic compounds. Finally, a linear relationship between tyrosol content and the total phenolic content of the extracts was observed.
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