| Effects of different storage temperatures,packages,pretreatments(ClO2,6-BA and 1-MCP)and packaging union treatments under low temperature on storage quality and physiological changes of the fresh-cut green asparagus were studied in this research.It can provide the theory basis for storage techniques of fresh-cut green asparagus.The main results were as follows:1.Studies on the the fresh-cut green asparagus under(2±1)℃,(8±1)℃and(25±1)℃,the result showed that respiratory rate was depressed effectively,consumption of the substrate decreased;the cumulation of MDA was decreased effectively,the membrane permeability was protected;the higher levels of storage quality and physiological indices were kept under(2±1)℃.The activities of POD and PPO were significantly(P＜0.05),the different indexes of 10d storage were better than 6d storage under room temperature,the period of storage was delayed 10d.Therefore,(2±1)℃was suitable for fresh-cut green asparagus.2.The lower respiratory rate and higher contents of chlorophyll,soluble protein and soluble sugar were kept,MDA contents were decreased and the activity of PAL was increased effectively by packaging.The commodity rate was 79.79%which was better than control treatments significantly(P＜0.01)with 0.01 mmPVC during storage,the period of storage was delayed 15d.The fresh-keeping condition of 0.01 mmPVC was the best during the studies.3.Different concentration of Chlorine dioxide treatments was effective in keep-freshing of the fresh-cut green asparagus.The more concentration of aqueous chlorine dioxide was use, the sterilizing effect was the better under the concentration.The colony counts were lower than other treatments significantly(P＜0.01),the respiratory rate and cumulation of MDA were depressed effectively,the chlorophyll decomposed and the progress of fibrosis were delayed with 30mg·L-1ClO2 in 9d.The effects of 50mg·L-1ClO2 treatments was bad.4.It showed that the respiratory rate was lowed,the membrane permeability and the cumulation of MDA were decreased effectively,the activities of POD was increased,the chlorophyll decomposed and period of senescence were delayed with 20mg·L-1and 30mg·L-16-BA treatments in the fresh-cut green asparagus.The effects of 20mg·L-16-BA treatments were the best.The commodity rate was 84.50%and senescence index was 0.31%,which were better than control treatments significantly.The effects of 10mg·L-1 6-BA treatments was bad.5.Studies on the fresh-keeping of the fresh-cut green asparagus with 1-MCP treatments,it showed that the chlorophyll,soluble protein,soluble sugar contents were decomposed, MDA and crud fiber content were incresed,the activities of POD was increased and the activities of PPO was decreased,the period of tender stem senescence was delayed.The different indexes of 15d storage were equal to control treatments of 3～6d.The period of fresh-cut green asparagus storage could delay 15d withl.5mg·L-1for 12h 1-MCP and package of 0.01 mmPVC under low temperature.
|
PDF Full Text Request