Effect of Crushing Method on Drying Characteristics and Shrimp Powder Quality of Antarctic Krill

Objective:It explored a kind of crushing way that antarctic krill was dry and could keep that nutrient components of antarctic krill shrimp powder. Methods:Three kinds of equipment,namely blender,meat grinder and chopper,were used to crush the antarctic krill,and then prepared shrimp powder through dry crushing and screening. The effects of the three crushing methods and crushing time on the drying characteristics and shrimp powder quality of the antarctic krill were analyzed. Results:The particle size and drying temperature had significant effects on the drying efficiency of antarctic krill. Compared with the entire antarctic krill(5~7 cm),particle size of 0.1~3 cm of antarctic krill,drying efficiency increased by 30.6%~48.6%,the drying temperature rose from 90 ℃ to 140 ℃,drying efficiency increased by 43.71%~60.30%. The chopper had a poor degree of fragmentation and low uniformity to the antarctic krill,with the increasing of crushing time,54% of the antarctic krill was broken to the granularity of 4 mm or less. The degree of crushing and uniformity of the blender and meat grinder were better,with the increasing of the action time,90% of the antarctic krill was crushed to the granularity of 4 mm or less. The appropriate crushing time of different crushing equipment was different,the appropriate action time of the blender was 15 s,the appropriate action time of the meat grinder was 60 s,and the appropriate action time of the chopper was 90 s. The contents of three nutrients in shrimp powder prepared by chopper after crushing for 90 s was higher than that of shrimp powder prepared by crushing and processing by blender and meat grinder. Conclusion:Considering the drying efficiency of antarctic krill and the quality of its powder,it could be concluded that the chopper machine crushing treatment of antarctic krill for 90 s was a better crushing process. At this time,the corresponding particle size distribution of antarctic krill was 1 mm and below,accounting for 25%,1~2 mm accounting for 15%,2~4 mm accounting for 14%,4~6 mm accounting for 14%,6~8 mm accounting for 7%,and 8~12.5 mm accounting for 25%.