Effect Of Different Packing Transportation On Shelf Quality In ‘Hua You' Kiwifruit

Kiwifruit is favored by consumers and growers for its unique taste,high nutritional value and medicinal value,and has become one of the main fruit industries in China.Kiwifruit belongs to respiratory climacteric fruit,the deterioration process is very rapid after harvest.The mechanical damage caused by handing,loading and unloading,transportation and other circulation links strengthens the respiration and promotes the ripening of kiwifruit.Good packaging can effectively reduce the occurrence of mechanical damage and prolong the edible life of kiwifruit.There are many kinds of packaging in the market,and different packaging has different protective effects on fruits.Fruits with different maturity have different response effects to vibration.In this study,'Huayou'(Actinidia Chinensis)fruits were used as test material.After being picked,the fruit was stored in cold storage(1.5±0.5?)for 36 d,and the firmness was 4 kg/cm~2 for long distance transportation(1200 km).Fruit transportation packaging uses three kinds of packing methods commonly used in production(box packing,flat-a packing,flat-b packing).After transportation,the kiwifruit is stored in shelf at room temperature(10–15°C)and low temperature(1.5±0.5°C).The effects of different packaging on kiwifruit shelf quality were analyzed by measuring the changes of physiological quality indexes and cell structure.The main research results are as follows:1.The fruit weight loss rates of the three kinds of packaging were reduced,and the difference in fruit weight loss rates between low-temperature shelf packagings was not significant,and the lowest fruit weight loss rate of box packaging was 0.64%;The fruit weight loss rate of box packaging was significantly lower than that of flat packaging at room temperature.At low-temperature and room-temperature shelves,the decreased in fruit firmness of box packaging was significantly lower than that of flat packaging and there is no significant difference between flat-a packaging and flat-b packaging.2.Compared with the control group,the fruit respiration of the packaging was significantly reduced.The fruit respiration rate of the flat packaging was significantly higher than that of the box packaging at the end of the shelf.The fruit ethylene release rate of box packaging was significantly lower than that of flat-a packaging at low-temperature shelf,and there was no significant difference among the three types of packaging at room-temperature shelf.3.Compared with flat packaging,box packaging significantly inhibited the increase of soluble solids of fruits and maintained the titratable acid and Vc content in fruits.The activities of amylase and PG enzyme in box packaging were significantly lower than that in flat packaging,which delayed the degradation of starch and propectin,and inhibited the increase of soluble pectin content.5.The MDA content of three kinds of packaging kiwifruit was significantly lower than the control group,box packaging and flat-b packaging was lower than flat-a packaging;There was no significant difference in the fruit relative conductivity of the three kinds of packaging,and the box packaging was the lowest.At the end of the shelf,almost all the pulp cells of the control group were broken,and the pulp tissue of the flat package was seriously damaged compared with the box packaging.In summary,the three packaging could significantly reduce the weight loss rate,respiration rate and ethylene production of kiwifruit after transportation,and inhibit the decrease of primary pectin content.The values of firmness and vitamin c of kiwifruit samples from box packaging were significantly higher than that of the samples from flat packaging(P<0.05),and the soluble solid content(SSC)of kiwifruit samples from box packaging was significantly lower than that of the samples from flat packaging after the storage(P<0.05).No significant difference occurred in the relative conductivity among treatments of three kinds of packaging during shelf life(P>0.05).In conclusion,the box packing is more effective in preventing vibration damage and delaying the quality deterioration than flat packaging.