| Preparation of Free, Soluble Conjugate, and Insoluble-Bound Phenolic Compounds from Peels of Rambutan (Nephelium lappaceum) and Evaluation of Antioxidant Activities in vitro. | |
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MedLine Citation:
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PMID: 22250923 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The soluble phenolic compounds of rambutan peels (RP) were extracted by microwave-assisted extraction (MAE) and the operating parameters were optimized. The optimal conditions obtained were ethanol concentration of 80.85%, extraction time of 58.39 s, and the ratio of liquid to solid of 24.51:1. The soluble phenolic content by MAE was 213.76 mg GAE/g DW. The free, soluble conjugate, and insoluble-boaund phenolic compounds were prepared by alkaline hydrolysis, and the contents of 3 fractions were 185.12, 27.98 and 9.37 mg GAE/g DW, respectively. The contents of syringic acid and p-coumaric acid were high in the free fraction, showing 16.86 and 19.44 mg/g DW, and the soluble conjugate and insoluble-bound phenolics were mainly composed of gallic acid and caffeic acid. Furthermore, the antioxidant activities of 3 fractions were evaluated in 5 model systems. Results indicated that the free fraction had high antioxidant activities, compared with the soluble conjugate and insoluble-bound fractions. |
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Authors:
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Liping Sun; Huilin Zhang; Yongliang Zhuang |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-17 |
Journal Detail:
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Title: Journal of food science Volume: - ISSN: 1750-3841 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0014052 Medline TA: J Food Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2012 Institute of Food Technologists® |
Affiliation:
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Authors are with Research Center of Food Engineering, College of Chemistry and Engineering, Kunming Univ. of Science and Technology, Kunming, Yunnan 650224, China. Direct inquiries to author Zhuang (E-mail: kmylzhuang@yahoo.com.cn). |
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