Krill oil contains a lot of long-chain polyunsaturated fatty acids (LCPUFAs, such as: DHA, EPA) attached to the phospholipid and rich in astaxanthin. It is easier to be absorbed by the human body. The fresh krill must be freeze-dried to remove moisture before oil extraction and to avoid autolysis. Microwave freeze-drying krill can provide sublimation energy of frozen krill by microwave and overcome the heat transfer resistance in a freeze-drier with heat plate. Microwave vacuum freeze-drying can retain the quality of dried krill and avoid lipid oxidation, and it can save drying time and energy consumption. Further, the use of ethanol as solvent for microwave extraction microwave krill oil has a high extraction yield, fast and less energy consumption. Because microwave heating can rapidly increase temperature and pressure in the cells to cause krill cells rupture and the krill oil and active components can be dissolved in the ethanol to increase oil extraction yield. Moreover, if the microwave extraction system is operated at vacuum condition, then the temperature of the extract solution will be lower and also avoid lipid oxidation. Ethanol can be evaporated by microwave vacuum system to concentrate krill oil. Compared with supercritical carbon dioxide extraction, it can extract non-polar lipid without residual solvent, but the supercritical extraction equipment is expensive, time-consuming. The equipment of conventional solvent extraction is cheap, but it needs take a few hours to accomplish and may have organic solvent residues. However, the traditional freeze-drying and extraction take very long time to accomplish. The method is to apply microwave in freeze-drying krill and extraction of krill oil. It can improve processing efficiency and significantly decrease operation time and energy consumption.磷蝦油含有大量與磷脂質相接的長鏈多元不飽和脂肪酸(如:DHA、EPA)並含有豐富的蝦青素,它容易被人體吸收。為避免新鮮磷蝦的自溶作用,必須以冷凍乾燥去除水分,再進行後續的油脂萃取。利用微波提供磷蝦冷凍乾燥的昇華熱,此可克服傳統熱板式冷凍乾燥之熱量傳送障礙。微波真空冷凍乾燥磷蝦可保有良好的品質亦可避免油脂氧化,亦可節省凍乾的時間和能源損
