期刊
APPLIED SCIENCES-BASEL
卷 10, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/app10010220
关键词
deep eutectic solvents; extraction; Moringa oleifera; polyphenols; ultrasonication pretreatment
类别
资金
- European Union
- Hellenic Ministry of Economy & Development through the Operational Programme Competitiveness, Entrepreneurship and Innovation [T1EDK-05677]
Moringa oleifera L. leaves are a plant tissue particularly rich in polyphenolic phytochemicals with significant bioactivities, and there has been significant recent interest for the production of extracts enriched in these substances. The current investigation is aimed at establishing a green extraction process, using a novel eco-friendly natural deep eutectic solvent, composed of glycerol and nicotinamide. Furthermore, sample ultrasonication prior to batch stirred-tank extraction was studied to examine its usefulness as a pretreatment step. Optimization of the extraction process through response surface methodology showed that the maximum total polyphenol yield (82.87 +/- 4.28 mg gallic acid equivalents g(-1) dry mass) could be achieved after a 30 min ultrasonication pretreatment, but the difference with the yield obtained from the non-pretreated sample was statistically non-significant (p < 0.05). Extraction kinetics revealed that the activation energy for the ultrasonication-pretreated samples was more energy-demanding, a fact attributed to phenomena pertaining to washing of the readily extracted polyphenols during pretreatment. Liquid-chromatography-diode array-mass spectrometry showed that ultrasonication pretreatment may have a limited positive effect on polyphenol extractability, but the overall polyphenolic profile was identical for the ultrasonication-pretreated and non-pretreated samples.
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