Abstract
BackgroundObesity and other metabolic diseases have become epidemic which greatly affect human health. Diets with healthy nutrition are efficient means to prevent this epidemic occurrence. Novel food resources and process technology were needed for these purpose. In this study, Antarctic krill oil (KO) extracted from a dry krill by a procedure of hot pump dehydration in combined with freezing-drying was used to investigate health effect in animals including the growth, lipid and glucose metabolism.MethodsC57BL/6J mice were fed with a lard based high fat (HF) diet and substituted with KO for a period of 12 weeks in comparison with low fat normal control (NC) diet. Mice body weight and food consumption were recorded. Serum lipid metabolism - of C57BL/6J mice serum was measured. A glucose tolerance tests (GTTs) and pathology analysis of mice were performed at the end of the experiment.ResultsThe KO fed mice had less body weight gain, less fat accumulation in tissue such as adipose and liver. Dyslipidemia induced by high fat diet was partially improved by KO feeding with significant reduction of serum low density lipoprotein-cholesterol (LDL-C) content. Furthermore, KO feeding also improved glucose metabolism in C57BL/6J mice including a glucose tolerance of about 22% vs. 32% of AUC (area under the curve) for KO vs HF diet and the fast blood glucose level of 8.5 mmol/L, 9.8 mmol/L and 9.3 mmol/L for NC, HF and KO diet groups, respectively. In addition, KO feeding also reduced oxidative damage in liver with a decrease of malondialdehyde (MDA) content and increase of superoxide dismutase (SOD) content.ConclusionThis study provided evidence of the beneficial effects of KO on animal health from the processed technology, particularly on lipid and glucose metabolism. This study confirmed that as the Antarctic krill was extracted with a procedure of efficient energy, it might make it possible for Krill oil to be available for food industry.
Highlights
Obesity and other metabolic diseases have become epidemic which greatly affect human health
Characteristics of krill oil By using high quality of krill preserved by a novel procedure with a combination of heat pump drying and freezedrying process, KO was extracted by a subcritical extraction system with butane [13]
It contained a high amount of polyunsaturated fatty acids (PUFA) specific for omega-3 of Docosahexaenoic acid (DHA) and Eicosapentaenoic acid (EPA) of 16.3% and 9.6%, respectively
Summary
Obesity and other metabolic diseases have become epidemic which greatly affect human health. Antarctic krill oil (KO) extracted from a dry krill by a procedure of hot pump dehydration in combined with freezing-drying was used to investigate health effect in animals including the growth, lipid and glucose metabolism. Intake of food rich in antioxidants is beneficial to reduce the risk of the cardiovascular, high blood pressure and cancer [5]. KO in animal feeding with high fat diet has been demonstrated to improve its dyslipidemia, body weight and glucose metabolism [6,7,8]. KO containing diets can significantly improve fast blood glucose concentration and glucose intolerance leading to enhance insulin sensitivities in obese animals [8,9,10]
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