Effect of packaging container on storage quality of green asparagus juice

Green asparagus juices were pasteurized at 121℃ for 3min.Juices were filled with glass and polyethylene glycol terephthalate( PET) bottles which were sterilized in advance.Then the samples were stored at( 4 ± 1) ℃. To explore the effect of packaging container on storage quality of green asparagus juice,the changes of color,chlorophyll,carotenoids,vitamin C,total phenolic and reducing sugar contents were measured during chilled storage.The results showed that the increase of lightness and loss of greenness in the green asparagus juice were retarded by glass bottle; the increase in carotenoids contents were prevented by glass bottle. Thus glass bottle packaging can effectively keep green and color stability of green asparagus juice during chilled storage. The L*was 56.15,a*was-1.27,and total chlorophyll content was 5.584 mg / L in the green asparagus juice packaged by glass bottle at the end of storage. The decreases of vitamin C,total phenolic and reducing sugar contents were inhibited by glass bottle. Especially,vitamin C content was 0.204 mg / m L and retained 82.93% at 3 month. Total phenolic and reducing sugar contents were retained 52.74%,64.58%,respectively. Vitamin C,total phenolic and reducing sugar contents of juices in PET bottle were retained 28.05%,43.68% and 58.67%. Thus,glass bottle packaging can effectively keep the storage quality of green asparagus juice during chilled storage.