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Abstract
Making Antarctic krill oil into emulsion is a good way to utilize Antarctic krill, but proliferation of microorganisms cannot be ignored. H2O2 is widely used in the sterilization of liquid food since its decomposition products are environmentally friendly, although residual H2O2 should be removed for food safety. Adding catalase (CAT) is an effective means to do this. However, the enzyme activity center of CAT is the iron porphyrin group, which has the risk of accelerating lipid oxidation in the oil emulsion. Therefore, we hypothesized that CAT might not be suitable for the removal of H2O2 in Antarctic krill oil emulsion. In this paper, Antarctic krill oil emulsion was prepared, and then the effect of CAT on the emulsion was studied through visual observation, microscopic morphology observation, turbidity and stability, particle size, and ζ-potential; finally, the mechanism of CAT destroying the emulsion was explored from the perspective of lipid oxidation. The results showed that a stable Antarctic krill emulsion was prepared using Tween-80 as the emulsifier, with the oil concentration of 1% (v/v) and the ratio of surfactant to oil phase of 1:5 (v/v). The emulsion treated with CAT had undergone demulsification, stratification, and coagulation after 2 days of incubation, while the emulsion treated with superoxide dismutase (SOD) and bovine serum albumin (BSA) changed little. In addition, the thiobarbituric acid reactive substances (TBARS) value and the content of hydroxyl radicals in the CAT group increased significantly. The preliminary research results indicated that the effect of CAT on the emulsion related to the lipid oxidation caused by the iron porphyrin group at the center of the enzyme activity. All these results indicated that CAT was not suitable for the removal of residual H2O2 in Antarctic krill oil emulsion. Moreover, it is helpful to avoid the contact of Antarctic krill oil emulsion and CAT during the processing of the krill.
Highlights
Antarctic krill (Euphausia superba) is a type of crustacean plankton that lives in the Antarctic Ocean and has attracted strong research interest from all over the world
Antarctic krill oil was slowly added to the system and the mixture was homogenized at 18,000 rpm for 3 min
The results showed that CAT could significantly promote the oxidation reaction in the emulsion. All these results indicated that CAT was not suitable for the removal of residual H2O2 in Antarctic krill oil emulsions
Summary
Antarctic krill (Euphausia superba) is a type of crustacean plankton that lives in the Antarctic Ocean and has attracted strong research interest from all over the world. It is reported that the resource storage of Antarctic krill is about 800 million tons [1], with an annual post-larval production of 342 to 536 million t. The annual catch of Antarctic krill is about 250,000 t, which is only about 1/3 of its catch limit set by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Antarctic krill is usually utilized by being processed into bait used in aquaculture industries [3]. Due to the limited scale of aquaculture and the variety of bait resources, expanding the utilization ways of Antarctic krill resources is becoming increasingly important. Antarctic krill oil is rich in phospholipid-bound n-3polyunsaturated fatty acid (n-3PUFA). Antarctic krill is a good resource for preparing functional oils
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