Evaluation of Techniques and Freshness Keeping Effect of Modified Atmosphere Packaging(MAP) on Pacific White Shrimp

To study the freshness keeping effects of the different combination proportion of CO2,O2 and N2 on Pacific white shrimp,shrimps were modified atmosphere packaged in the K-PET/PE bags made of high-barrier compound packaging materials,of which all groups were preserved at 4 ℃. The sensory evaluation,L* value,b* value,pH,total bacterial count (TBC) and total volatile basic nitrogen (TVB-N) were examined to assess freshness keeping effects of all groups. The results showed that the freshness keeping effects of 85% CO2/5% O2/10% N2 and 40% CO2/30% O2/30% N2 were best of all,which obviously extended the shelf-life of Pacific white shrimp at cold storage.