Relationship between Storage Environment and Fruit Quality of a Pear Cultivar Xinli No.7 at Different Picking Time

[Objective] This study aimed to study the effects of different picking time and storage environment on fruit quality of a pear cultivar Xinlin No.7 and the relationship between storage environment and fruit quality, so as to provide a theoretical basis for storage and preservation of Xinli No.7. [Method] The fruits of Xinli NO.7 were picked up in August （optimal） and September respectively and then stored in room, cellar and freezer, respectively. The dynamics in temperature, humidity, CO2 concentration, fruit weight loss rate, pericarp chlorophyll content and fruit interior quality were determined. [Result] The environment differed significantly among different storage methods. In room and cellar, the temperature showed a downward trend, and the humidity decreased after early-mid October. The CO2 concentration changed steadily, and increased rapidly in cellar after December. In freezer, the temperature and humidity changed steadily, and the CO2 concentration increased after October. The changes in quality of the fruits harvested in August and September were similar. There was a certain correlation between storage environment and fruit quality of Xinli No.7. In room and cellar, the variation trends of tem- perature and humidity were consistent with those of chlorophyll content, fruit hardness and titratable acid content with positive correlations, but were opposite from those of fruit weight loss rate, soluble solids content and soluble sugar content with negative correlations. In freezer, the CO2 concentration was closely related to the changes in fruit quality. Its variation trend was consistent with those of fruit weight loss rate and soluble solids content, but was opposite from those of pericarp chlorophyll content, fruit firmness, soluble sugar content and titratable acid content. The differences in some of the traits reached significant levels （P〈0.05, P〈0.01）. [Conclusion] With the extension of storage time, the temperature, humidity and CO2 concentration changed according to different patterns among different storage methods. The changes in fruit quality of Xinli NO.7 were related to the storage environment, especially to the temperature, to a certain extent.

Determination of volatile profiles inside apple fruit storage facilities using Monotrap^(TM)monolithic silica adsorbent and GC-MS

The interior atmosphere of storage facilities is very important for maintaining fruit quality and delaying senescence,so it’s of significance to determine the volatile profiles in this environment for the postharvest industry.However,volatile profiles inside fruit storage facilities have been rarely reported.To study the volatile profiles of the atmosphere inside fruit storage facilities,a method comprising Monotrap^(TM)adsorbent and GC–MS analysis in the study was developed and tested.Based on that,the volatile profiles in the atmosphere inside fruit storage facilities at four locations in Shaanxi Province were monitored.Altogether thirty-six volatiles were detected,and most of them were identified as esters.An analysis of the similarities of volatile profiles showed that the three storage rooms at each location clustered together.The storage rooms at two locations in Baoji had the most similar volatile profiles,and both were similar to that at Xianyang,but different from that at Yan’an,which were consistent with their geographic distributions.On the basis of a principal component analysis,heatmap dendrogram,and correlation matrix analysis,these compounds clustered into five groups.Compounds in Group 1,which were abundant in the storage room at Yan’an,were branched-chain esters,whereas the compounds in the other four groups were mainly straight-chain esters which were abundant in the storage rooms at Xianyang and Baoji.The difference among volatile profiles inside fruit storage facilities at four locations might be caused by ultraviolet radiation.In this study,we demonstrated the Monotrap^(TM)adsorbent and GC–MS analysis were an efficient method for volatile compounds detection inside fruit storage facilities.