The Influence Of Different Packing Materials On Storage And Keeping Fresh Effect Of The Nanguo Pear

In order to solve the influence of different packing materials on storage and keeping fresh effect of the nanguo pear , we had studied the changes in quality, physiology and enzyme activity by using Nanguo pears produced in Anshan as material .The results indicated that craft paper and micro-porous film have different emphasises on keeping fresh effect during storage at low temperature . Craft paper could affect external quality of the Nanguo pear , such as turning yellow slowly , low rot rate , low ethylene peak and high titratable acidity content . Micro-porous film could affect enzyme activity of the Nanguo pear , keeping high SOD activity , low PPO activity and POD activity . Besides , micro-porous film could make the aging speed of the Nanguo pear slow , especially respiration peak being diminished and gentle . It keeps quality of the Nanguo pear well . Two methods compared , the effect of micro-porous film is better than the effect of craft paper during storage at low temperature .During long storage at low temperature , the keeping fresh effect of the Nanguo pear through different afterripening time , packed with micro-porous film , is that the longer the time of afterripening , the worse the storability . The Nanguo pear of no afterripening time has better quality , changes of physiology small , PPO and POD activity low . In other words , the Nanguo pear of no afterripening time could be stored in a long time . But the Nanguo pear that the afterripening time is 10 days browns rapidly and rots seriously .During storage at normal temperature , micro-porous film and PVC film compared , result is that micro-porous film could keep the quality of the Nanguo pear; restraining brown , delaying storage , enhancing commercial value . Owing to over-low permeation of gas , nanguo pear packed with PVC film brown easy .