Optimization of Process on Extracting Flavonoids from Dry Onion Skins by Alkaline Method

Guoqing, Shi; Qisen, Xiang; Yichao, Fan; Wenen, Zhao; Yanqi, Liu

Optimization of Process on Extracting Flavonoids from Dry Onion Skins by Alkaline Method

Shi Guoqing^{1, 2, 3}, Xiang Qisen^{1, 3}, Fan Yichao¹, Zhao Wenen², Liu Yanqi^{*, 1, 3}

¹ School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450002, PR. China

² School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan, 450001, P.R. China

³ Henan Collaborative Innovation Center for Food Production and Safety, Zhengzhou, Henan, 450002, PR. China

Article Information

Identifiers and Pagination:

Year: 2015
Volume: 9
First Page: 39
Last Page: 46
Publisher ID: TOCENGJ-9-39
DOI: 10.2174/1874123101509010039

Article History:

Received Date: 08/01/2015
Revision Received Date: 29/03/2015
Acceptance Date: 07/04/2015
Electronic publication date: 26/6/2015
Collection year: 2015

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© 2017 Guoqing et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

^* Address correspondence to this author at the School of Food and Bioengineering, Zhengzhou University of Light Industry, Henan, 450000, P.R. China; Tel: 13938228293; E-mail: liuyanqi@zzuli.edu.cn

The flavonoids in dry onion skins were extracted by alkaline solution method. On the basis of single factor combined with ternary quadratic regression general rotary unitized design, the effects of several extraction parameters on the extraction efficiency of total flavonoids were investigated, including extraction times, pH of the extraction solution, material / extraction solution ratio, extraction time, and temperature. NaNO₂-Al(NO₃)₃-NaOH method was used for the determination of total flavonoids. The optimal extraction conditions were as follows: two times of extraction; pH, 11; material / extraction solution ratio, 30 : 1; extraction temperature, 83.0 ~ 84.0 °C; extraction duration, 1.9 ~ 2.0 h. Under the above optimal conditions, the flavonoids extracted from dry onion skins yielded 2.82%.

Keywords: Flavonoids, extraction, onion skins.

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RESEARCH ARTICLE

Optimization of Process on Extracting Flavonoids from Dry Onion Skins by Alkaline Method

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