Effects of different controlled atmosphere elements on storage effect of blueberry during cold storage

In order to ascertain the effects of different controlled atmosphere elements on quality and volatile substances of blueberries stored by portable controlled atmosphere box,effects of portable controlled atmosphere box combined with different controlled atmosphere elements( Number 2,3,5,6,7) on good fruit rate,firmness,soluble solid and titratable acidity content of ‘Berkeley 'blueberries during cold storage were studied,volatile substances of blueberries with different treatments at 60 d was analyzed by PCA using electronic nose.The results showed that fruit quality in box with 3,6 and 7 controlled atmosphere elements was superior to control group obviously for short storage( 30 d),and the gas composition inside plastic modified box with 7 controlled atmosphere element could maintain the range of 10.5% ~14.9% O2 and 5.5% ~10.5% CO_2,various quality indexes were superior to other groups,entire odour was close to control group,which was more suitable for blueberries in long-term storage. But O2 content inside plastic modified box with 2 and 5 controlled atmosphere elements was under 3%,CO_2 content exceeded 20%,which was harmful to storage blueberries. Therefore,7 controlled atmosphere element was more suitable for blueberries to storage.