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Cong XY, Miao JK, Zhang HZ, Sun WH, Xing LH, Sun LR, Zu L, Gao Y, Leng KL. Effects of Drying Methods on the Content, Structural Isomers, and Composition of Astaxanthin in Antarctic Krill. ACS Omega 2019; 4:17972-17980. [PMID: 31720501 PMCID: PMC6843707 DOI: 10.1021/acsomega.9b01294] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 09/06/2019] [Indexed: 06/10/2023]
Abstract
Antarctic krill (Euphausia superba) is one of the important bioresources in Antarctic waters, containing many bioactives (e.g., astaxanthin), which have a highly potential value for commercial exploitation. In this study, the effects of processing methods on the content, structural isomers, and composition of astaxanthins (free astaxanthin and astaxanthin esters) were studied. Three drying methods, comprising freeze-drying, microwave drying, and hot-air drying, were used. Free astaxanthin (Ast), astaxanthin monoesters (AM), and astaxanthin diesters (AD) in boiled krill (control) and dried krill were extracted and analyzed using high-resolution mass spectrometry with ultraviolet detection. After the three processes, total astaxanthin loss ranged from 8.6 to 64.9%, and the AM and AD contents ranged from 78.3 to 16.6 and 168.7 to 90.5 μg/g, respectively. Compared to other kinds of astaxanthin esters, astaxanthin esters, which linked to eicosapentaenoic acid and docosahexaenoic acid, as well as the Ast, were more easily degraded, and AM was more susceptible to degradation than AD. All-E-astaxanthin easily transformed to the 13Z-astaxanthin than to the 9Z-astaxanthin during the drying process, but the proportions of optical isomers changed due to drying by no more than 5%. The results suggested that freeze-drying, low-power microwave drying (≤1 kW), and low-temperature hot-air drying (≤60 °C) are optimal drying methods for ensuring the quality of krill products.
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Affiliation(s)
- Xin-Yuan Cong
- School
of Public Health Qingdao, Qingdao University, Qingdao 266071, China
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
| | - Jun-Kui Miao
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
- Qingdao
Engineering Research Center of Exploitation of Polar Fishery Resource, 106 Nanjing Road, Qingdao 266071, Shandong, China
| | - Hui-Zhen Zhang
- Qingdao
Food and Drug Administration, Qingdao 266100, Shandong, China
| | - Wei-Hong Sun
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
| | - Li-Hong Xing
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
| | - Li-Rui Sun
- Department
of Food Science and Engineering, Ocean University
of China, 5 Yushan Road, Qingdao 266003, Shandong, China
| | - Lu Zu
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
- Key
Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
| | - Yan Gao
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
- Key
Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
| | - Kai-Liang Leng
- Yellow
Sea Fishery Research Institute, Chinese
Academy of Fishery Sciences, Key Laboratory of Sustainable Development
of Polar Fishery, Ministry of Agriculture, 106 Nanjing Road, Qingdao 266071, Shandong, China
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