Study Of Fresh-maintaining Technique Of Fresh-eating Maize In Post-harvesting

Several fresh-maintaining techniques of fresh-eating maize in post-harvesting were studied from the year 2005 to 2007 by using Zhongnuo No.1 and Luhuangnuo No.6 which planted by the Shandong Province host in this paper. This research will provide the basis for the development of fresh-maintaining techniques of fresh-eating maize.The effect to fresh-eating maize quality which preserved remaining bracts or not under different temperature was studied. The result demonstrates that conservation of fresh-eating maize remaining bracts is lessening quicker and weightlessness rate bigger than no bracts fresh-eating maize packed with plastic bag at both ordinary and low temperature. The conservation effect at low temperature was better than at ordinary temperature, and the time retaining freshness was longer too. This result showed that the conservation effect packing with plastic bag down bracts was better than remaining bracts.Fresh-eating maize in post-harvesting were fresh-maintained with different smear film(such as Chitosan, smear film, physic acid)on homoeothermic. Physic acid is the best for holding water. Chitosan spreads film being most notable to the breath restraint. smear film with physic acid can restraint solubility sugar contents getting down is most obvious, otherwise, smear film free radical content such as lightening the film grease per-oxidation effect , cutting down MDA spread a film but obvious increases by. The Tu film stores under low-temperature condition being able to change moisture content and solubility sugar contents, reducing the fresh food waxy corn obviously gathers queen weight sudden drop trend, makes to store up obvious extension of scheduled time. Spread film middle three kinds, establish acid spreading a film disregarding showing fairly good effect in the field of every such as guaranteeing water effect, solubility sugar contents, antibiosis ability and eating taste quality. Indicate freshness establishing acid spreading a film being that one is fairly good eating the waxy corn compound antistaling agent.Under the low temperature, the maize indicates to fresh food fruit following a gas to exchange the test result retaining freshness: The intensity handles average plastic bag package breath always lower than the 4th treatment , obviously , CO2 content overtops 4 treatment then this explains that the average plastic bag is more effective to breath intensity restraint. But excessive restraint breath effects bring about whose regular suppression process accepting a disturbance or destroy, the product being able to bear hoards nature , disease resistance all happens declining rapidly to descend, the leaf gas tune to the waxy corn stores responding to appropriate restraint it's breath intensity, to keep whose regular assimilation of the new and excretion of the old process therefore. The silicon window bag appears to gas-exchange peak deferring very obvious. The experiment is indicated: Treatment being able to perceive silicon window area from hoarding effect for 6.6 cm~2/kg, from aspect such as deferring breath peak value appearing, cutting down moisture content dissipating being suitable to the product storing more , sampling the person eating taste grade most highly. Explain that 6.6 cm~2/kg silicon windows area gas tune effect is best.Above three kinds of maintaining freshness technology's research is revolves the fresh food mealie quick-freeze maintaining freshness technology and the vacuum maintaining freshness technology development research, is extends or the consummation research to two kind of maintaining freshness technologies. In three kinds of maintaining freshness engineering research experiment, the low temperature paint film maintains freshness the experiment to maintain freshness the effect to be good. And the physic acid paint film maintains freshness the effect to be most ideal, the maintaining freshness time may achieve above 40d has provided the experiment basis and the new method for the fresh food mealie vacuum maintaining freshness technology's consummation.