Preparation For The Antarctic Krill Oil Micro Capsules Based On Complex Coacervation And Spray Drying Technique

Antarctic krill oil has a high nutritional value and an important role in food processing,in particular the type of phospholipid polyunsaturated fatty acids,free fatty acid ester and astaxanthin.However,unsaturated fatty acids and astaxanthin in krill oil are easily to oxide,it has a poor flavor after that,which not only lost its original nutritional value,is more likely to cause cancer and other human impacts health diseases,greatly reducing its food value.In addition,krill oil is a liquid,large viscosity and easily soluble in water,that will bring great distress in the food processing and packaging.Krill oil microencapsulated can form a solid powder microcapsules,after prolonged storage efficiency can be embedded in the process of Antarctic krill oil oxidative deterioration the time used and will cover up bad smells.And after that it can form a good flowability solid particles,products and raw materials are easily to mix,easy packaging and transporting,and improve a lot of inconvenience,making it stable quality,and ease of processing and utilization,and protection of the Antarctic phosphorus shrimp its nutritional value.In this thesis,first,complex was used to embed the Antarctic krill oil and investigated emulsification shear rate,p H and ratio of core material and wall material on the Antarctic krill oil microcapsule morphology and embedding rate;second,spray-drying was used to embed the Antarctic krill and investigated the wall material ratio,ratio of core material and wall material,solids content and emulsifier content on the emulsion stability,viscosity and particle size distribution;third,samples were prepared by spray drying method under optimal conditions,low-field NMR technology combining PLSR established a method for rapid non-destructive detection of Antarctic krill oil microencapsulation rate;Finally,we have researched on Antarctic krill oil storage stability of the microcapsules at-4 ℃,22 ℃ and 40 ℃ conditions,and examined the lipid composition classification,acid value and astaxanthin these three indicators.Studies have shown that: Antarctic krill oil microcapsules by complexed coacervation whose ratio of core material and wall material was 1.75: 1,emulsification shear rate was 20 400 rpm,p H was 4.0 under the optimal conditions;Antarctic krill oil capsules’ morphology were regular,nearly circular,uniform particle size distribution,internal multi-core microcapsule under an optical microscope.Optimal conditions for spray drying method were: the mass ratio between gelatin and maltodextrin 1:3;the mass ratio between core and wall 2:3;solid content 20%;Tween-80 as an emulsifier and its contents of 3.5%;homogenization pressure 40 Mpa.Under these conditions,spray-drying was better,and had less sticky wall phenomenon.The side of Antarctic krill oil microcapsules were 0.5 ~ 20μm,diameter were predominantly between 1 ~ 10μm,an average particle size was 2.517μm when the volume fraction of 50%,it was truly a microencapsulated.The results of low-field NMR showed that: R~2 was greater than 0.85,RMSE was small,those indicated PLSR prediction model could effectively predict microencapsulation rate.Storage stability experiments showed that three indicators was relatively stable at-4 ℃.Antarctic krill oil microcapsules were detected and characterized,which was feasible,and had greatly improved in terms of appearance,powder flow ability,dispersion,or product odor,and that achieved the purpose of microencapsulation;we realized microencapsulation rate of rapid,non-destructive testing technology for the first time by the low-field NMR;-4 ℃ under the storage conditions were more conducive to the Antarctic krill oil microcapsule samples.