期刊
FOOD AND BIOPRODUCTS PROCESSING
卷 92, 期 C3, 页码 321-327出版社
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.fbp.2012.12.006
关键词
Pomegranate flowers; Oleanolic acid; Ursolic acid; Antioxidant activity
资金
- National Natural Science Fund [30970256]
- Shandong Provincial Natural Science Fund, China [ZR2010CM027]
An ecofriendly ultrasonic-assisted extraction (UAE) technique was developed for rapid extraction of bioactive compounds oleanolic and ursolic acids from pomegranate flowers. Several different influential extraction parameters, such as ultrasonic power, extraction time, solvent type, aqueous ethanol concentration, loading ratio and extraction temperature, were investigated. The optimum extraction conditions were 90% ethanol solution as solvent, ultrasound power 150 W, the liquid:material ratio of 20:1 (v/w) and extraction for 50 min at 40 degrees C. Scanning electron microscopy showed that ultrasonic treatment resulted in a number of pits on cells of pomegranate flowers. Extracts obtained from 30 min of UAE showed higher antioxidant activity than those of other conventional methods. The UAE method was more efficient than classical methods included maceration, stirring extraction and heat reflux extraction. (C) 2012 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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