期刊名称：Annals of the University Dunarea de Jos of Galati. Fascicle VI : Food Technology
印刷版ISSN：1843-5157
电子版ISSN：2068-259X
出版年度：2018
卷号：42
期号：1
页码：1-14
出版社：Galati University Press
摘要：The fruit of the date palm, Phoenix dactylifera L., is one of the richest fruit-based in
biologically functional phytochemicals. The efficient extraction of phenolic
compounds in this fruit by means of rapid, low cost, environment-free methods
would be a desirable achievement. A deep eutectic solvent (DES) based on lactic
acid and sucrose was considered as extraction solvent. DES are green solvents
composed of natural compounds and characterized by their negligible volatility,
high solubilization ability and tunable selectivity. In this line, the present study was
based on a step-by-step optimization of the extraction, taking into consideration
basic parameters, including solvent composition (lactic acid/sucrose ratio), solvent
concentration (0–100%) sample/solvent ratio (100/15 to 300/15 mg/ml) and
extraction time (3-40 min). The total phenolic compound content (TPC) was used to
evaluate antioxidant content of the extracts. DPPH radical scavenging activity was
used to evaluate antioxidant potential. Experimental results showed that all
extraction parameters investigated had significant effects (p < 0.05) on TPC and
antioxidant activity of the extracts. The best antioxidant activity (948.1mgAAE)/100
g) and the highest TPC (1393.5mgGAE)/100 g) were obtained with double
extraction using lactic acid/sucrose mixture with ratio of 3:1 at a concentration of
100%, with a sample/solvent ratio of 100mg/15ml, for 40 min. These results
suggested that the mixture lactic acid/sucrose may be an ideal candidate for use in
eco-friendly extraction processes. As a function of investigated extraction
parameters, phenolic contents were positively correlated with the antioxidant
activity.
关键词：Date fruit; green extraction; natural antioxidants; phenolics; natural deep
eutectic solvent;
