期刊
ULTRASONICS SONOCHEMISTRY
卷 31, 期 -, 页码 330-336出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2016.01.002
关键词
Chlorogenic acid; Ultrasound-assisted extraction; General extraction mechanism; Cynara scolymus L.
The use of ultrasound-assisted extraction (UAE) for the extraction of chlorogenic acid (CA) from Cynara scolymus L, (artichoke) leaves using 80% methanol at room temperature over 15 min gave a significant increase in yield (up to a 50%) compared with maceration at room temperature and close to that obtained by boiling over the same time period. A note of caution is introduced when comparing UAE with Soxhlet extraction because, in the latter case, the liquid entering the Soxhlet extractor is more concentrated in methanol (nearly 100%) that the solvent in the reservoir (80% methanol) due to fractionation during distillation. The mechanism of UAE is discussed in terms of the effects of cavitation on the swelling index, solvent diffusion and the removal of a stagnant layer of solvent surrounding the plant material. (C) 2016 Elsevier B.V. All rights reserved.
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