Extraction of oil from wet Antarctic krill (Euphausia superba) using a subcritical dimethyl ether method

Shulai Liu; Wei Hu; Yizhou Fang; Yanping Cai; Jianyou Zhang; Jianhua Liu; Yuting Ding

doi:10.1039/C9RA06238F

Extraction of oil from wet Antarctic krill (Euphausia superba) using a subcritical dimethyl ether method

Shulai Liu,

^abc Wei Hu,

^abc Yizhou Fang,^d Yanping Cai,^abc Jianyou Zhang,^abc Jianhua Liu

*^abc and Yuting Ding*^abc

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* Corresponding authors

^a Department of Food Science and Engineering, Ocean College, Zhejiang University of Technology, Hangzhou 310014, P. R. China
E-mail: jhliu@zjut.edu.cn, dingyt@zjut.edu.cn
Fax: +86 571 88320237
Tel: +86 571 88320237

^b National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, P. R. China

^c Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, P. R. China

^d Key Laboratory of Marine Food Quality and Hazard Controlling Technology of Zhejiang Province, College of Life Sciences, China Jiliang University, Hangzhou, Zhejiang 310018, P. R. China

Abstract

In this study, a novel method for obtaining high-quality krill oil from wet Antarctic krill by using subcritical dimethyl ether (SDE) was proposed. A response surface design was used to obtain the best SDE extraction parameters. The optimum extraction efficiency of 93.77 ± 0.92% was obtained at a stirring speed of 1030 rpm, temperature of 47 °C and dynamic extraction time of 90 min. Compared with n-hexane, ethanol, supercritical CO₂ and subcritical n-butane extraction, the krill oil extracted by SDE exhibited low peroxide values (1.46 ± 0.26 mmol kg⁻¹), high astaxanthin (218.06 ± 4.74 mg kg⁻¹), phosphatidylcholine (PC) (33.95 ± 0.65%), and phosphatidylethanolamine (PE) (11.67 ± 0.23%) content. Moreover, krill oil extracted by SDE has high levels of EPA (16.38 ± 0.05%) and DHA (7.91 ± 0.07%). SDE extraction proved to be an efficient and safe method for extraction of quality krill oil from wet Antarctic krill, and it could be a promising method for oil extraction in wet food in future.

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Extraction of oil from wet Antarctic krill (Euphausia superba) using a subcritical dimethyl ether method

Abstract

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Extraction of oil from wet Antarctic krill (Euphausia superba) using a subcritical dimethyl ether method

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