Effect of Modified Atmosphere Package Conditions on Preservation of Green Walnut Fruit and Kernel Traits
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Abstract:
To explore the proper mode of modified atmosphere package for fresh walnut preservation, green walnut fruit of cv. Liaoning2 and Xifu2 were harvested and stored in active modified atmosphere package with PE50 (aPE50) and pPE50 with pretreatment of 80~85% CO2 pulse (CO2 + pPE50), passive modified atmosphere package with PE50 (pPE50) was as control. Then they were stored with two-step way at 0~1 ℃, with RH of 70~80%.The results showed that aPE50 package presented most effective function of atmosphere modification on both varieties, after 18d-storage when they reached stable relatively, the volume fraction of O2 and CO2 were 4.6~5.4% and 9.6~11.0%, respectively . Storage decay rates of the fruit from aPE50 were the lowest, being 12.2% in Liaoning 2 and 15.7% in Xifu 2 after 80 d .Sensory quality decline of kernel was slower in aPE50 and faster in CO2+pPE50 compared with control. Content of total phenols, flavonoids, tannin, ascorbic acid(VC), reduced glutathione (GSH) in green husk from both aPE50 and CO2 + pPE50 were greater statistically than those from control (p<0.01). During the continuous storage of peeled fresh walnut, kernel from aPE50 gained the least increase in acid value and peroxide value, showed increase of total phenols and flavonoid in later stage; persistent lower MDA content and lipoxygenase (LOX) activity than control and CO2+pPE50. Therefore, aPE50 was a better mode of modified atmosphere package for fresh walnut preservation than others.
