Abstract
Antarctic krill oil is high in nutritional value and has biological functions like anti-inflammation and hypolipidemic effects. But it has and unpleasant smell, and unsaturated fatty acids are prone to oxidative deterioration. Its high viscosity and low solubility in water make it difficult for processing. Microemulsion can be a new promising route for development of krill oil product. We determined a formula of krill oil-in-water microemulsion with krill oil: isopropyl myristate = 1:3 as oil phase, Tween 80:Span 80 = 8:2 as surfactant, ethanol as co-surfactant and the mass ratio of surfactant to co-surfactant of 3:1. After screening the formula, we researched several characteristics of the prepared oil-in-water microemulsion, including electrical conductivity, microstructure by transmission electron microscope and cryogenic transmission electron microscope, droplet size analysis, rheological properties, thermal behavior by differential scanning calorimeter and stability against pH, salinity, and storage time.
Highlights
Krill oil is extracted from a species of Antarctic krill, Euphausia superba, which is mainly active in the deep ocean and can be a food source for several larger marine animals [1].Krill oil (KO) is rich in omega-3 polyunsaturated fatty acid (PUFA) and has security as an unconventional food source for ω-3 PUFAs [2,3], generally recognized as safe (GRAS) by the American Food and DrugAdministration (FDA) [4]
For the best formula, we explored the change of electrical conductivity when water content of the microemulsion area increased from 0% to 80%
The best formula selected by comparing the size of the microemulsion area in the pseudo-ternary phase diagram was: Antarctic krill oil:isopropyl myristate (IPM) = 1:3 as the oil phase, Tween 80:Span 80 = 8:2 as surfactant, ethanol as co-surfactant, and the mass ratio of surfactant to co-surfactant (Km) was 3:1
Summary
Krill oil is extracted from a species of Antarctic krill, Euphausia superba, which is mainly active in the deep ocean and can be a food source for several larger marine animals (e.g., seals and whales) [1].Krill oil (KO) is rich in omega-3 polyunsaturated fatty acid (PUFA) and has security as an unconventional food source for ω-3 PUFAs [2,3], generally recognized as safe (GRAS) by the American Food and DrugAdministration (FDA) [4]. Krill oil (KO) is rich in omega-3 polyunsaturated fatty acid (PUFA) and has security as an unconventional food source for ω-3 PUFAs [2,3], generally recognized as safe (GRAS) by the American Food and Drug. In the respect of hormone level, the hormonal fluctuation caused in polycystic ovary syndrome (PCOS) was brought to nearly normal levels by omega-3 fatty acid present in the krill oil, showing its potential effect and an alternative to metformin in treating. Zhan found that supplementing Antarctic krill oil (AKO) in the diet for 21 days was beneficial to the longitudinal bone growth of adolescent male mice by the growth hormone-insulin-like growth factor-1 (GH-IGF-1) pathway, which indicates that AKO might be a potential functional food and could improve adolescents’ growth potential [11]
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