Extraction of oil from wet Antarctic krill (

• Published in: RSC Advances
• Main Authors: Liu, Shulai, Hu, Wei, Fang, Yizhou, Cai, Yanping, Zhang, Jianyou, Liu, Jianhua, Ding, Yuting
• Format: Article in Journal/Newspaper
• Language: English
• Published: PubMed Central 2019
• Subjects: Antarc*; Antarctic; Antarctic Krill
• Online Access: https://doi.org/10.1039/c9ra06238f; https://pubmed.ncbi.nlm.nih.gov/35529959; https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9073929/

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.