Study On Curing Technology And Stability Of Algae Oil

Seaweed oil is a lipid derived from marine algae and rich in polyunsaturated fatty acids such as eicosapentene(EPA)and docosahexaenoic(DHA)acid.EPA and DHA are omega-3-series polyunsaturated fatty acids,and the human body can not synthesize.they have many physiological functions and nutritional value,but EPA and DHA are unstable in light,heat and oxygen,so they are easily oxidized.The paper optimized the wall material,emulsifier and antioxidant,determined the preparation method of EPA alga oil microcapsules,selected the best conditions of microencapsulation,discussed the change rule of fatty acid and oxidation products during the storage process of EPA alga oil microcapsules,and hoped to provide reference for the technology of EPA alga oil solidification and the stability of alga oil microcapsules.The main findings are as follows:1.The key factors of curing EPA oil by spray drying were studied.The optimum technological parameters for preparing EPA oil microcapsules were determined by orthogonal optimization experiments.The kinds of Wall materials were octene-succinate starch sodium(HI-CAP100)and maltodextrin(DE20),the ratio of which was 4:1.The single glyceride was used as emulsifier and the addition was 0.2 % of the solid.30 percent fuel load;45% solid content;The homogeneous pressure was 35 Mpa and 3 times.The intake temperature is 190 °C and the outlet temperature 90 °C.The microencapsulation effect is best and the oxidation of alginate oil is less.2.Expanded production through pilot to verify the results of the pilot test and compare the effect of microencapsulation with that of the pilot test.The encapsulation effect of the microencapsulated products was similar to that of the small ones,which were over 98 %,and the angle of rest was small(43.99),the fluidity was good,The pine density is 0.54 and the density is 0.81,However,the Peroxide value increased by 3.26 mmol/kg compared to the small test microencapsulation product.The products in the test and the small test have the following common characteristics: the macroscopic shape is white powder,no clumps and impurities,no obvious smell of algae oil.The microstructure is irregular and spherical,the surface is partially concave,and has no cracks and good integrity.3.The changes of basic oxidation products,including POV,TBA,acid value,anisidine value,aldose and ketone compounds were studied after microencapsulated EPA algal oil with different antioxidant combinations after storage of 90 days at 37 °C and 30 days at 63 °C.During 90 days of storage at 37 °C,the oxidation degree of microencapsulated alga oils were lower.The POV value increased in the first 21 days and then decreased slowly.anisidine value rose slowly in the first 28 days and sharply after 28 days.Both TBA and acid prices showed stable change.The total amount of aldehydes and ketones increases with storage time.The antioxidant combinations were VE,VC palmitate and Rosemary extract,with 90 days microencapsulated POV,TBA,Acids,anisidine,aldose and ketone compounds values of 6.52 mmol/kg,5.73 mg/kg,2.73 mg/g,21.10,369.87 ?g/g,respectively,The antioxidant effect of microencapsulated algal oil without antioxidants was the worst.The POV,TBA,acid,fennel and aldose and ketone compounds values of microencapsulated algal oil were 13.60 mmol/kg,4.72 mg/kg,3.98 mg/kg,38.48,927.34 ?g/g,respectively.Microencapsulated algal oil with different antioxidant combinations added during storage of 30 days at 63 °C.POV value gradually increased in the first 12 days and then decreased slowly.TBA,acid and Huixiange all showed steady and slow increase.The two antioxidant combinations VC palmitate and Rosemary extract,VE and Rosemary extract had better antioxidant effects,with POV,TBA,acid,anisidine,aldose and ketone compounds values of 2.57 and 5.59 mmol/kg,2.75 and 2.75 mg/kg,3.36 and 3.315 mg/g,19.86 and 5.85,182.11 ?g/g and 191.83 ?g/g,respectively,after 30 days of storage.The antioxidant free microcapsules were the least effective in all microcapsules,and crude oil had less antioxidant capacity than some solid oils at high temperatures4.The changes of fatty acids in the preparation and storage of microencapsulated EPA algal oil were compared.The fatty acid composition and content of EPA algal oil were not changed before spray drying.The effective components of EPA and DHA were reduced 0.49 % and 0.82 %,respectively after spray drying.During 90 days of storage at 37 ?,the antioxidant effect of cured microcapsules was better.The contents of EPA and DHA in PUFA decreased slightly after 60 days of storage,while the contents of C16:0 in SFA and 9t18:1 in TFA increased slightly,but the decrease and increase were not significant.Here was no significant difference in fatty acids during storage by adding different combinations of antioxidants,The microencapsulated EPA algal oil with the combination of VE,VC palmitate and rosemary were the least oxidized,The active ingredients EPA and DHA were reduced 1.91 % and 1.73 %,respectively.During 24 days of storage at 63 ?,the overall oxidation degree of microcapsules was higher than that at 37 ?,and the changes of SFA,PUFA,MUFA and trans in different samples were similar to 37 ?.Microencapsulated EPA algal oil without adding antioxidants produce the worst oxidation,EPA and DHA decreased 3.57 % and 6.75 %,respectively.Microencapsulated EPA algal oil with VC palmitate and rosemary extract antioxidant effect is the best,EPA and DHA decreased by only 0.69 % and 2.04 %,respectively.In short,Under the optimal process parameters,the EPA algal oil microencapsulation obtained by spray drying method has a good effect,and the resulting microcapsule products have good physical properties and can be used for industrial large-scale production.In order to prevent the oxidation of microcapsule products during the storage process,the antioxidant combination rosemary extract and VC palmitate have the best antioxidant effect at 63 °C storage conditions,and VE,VC palmitate and rosemary extract have the best antioxidant effect at 37 °C storage conditions.