| Grain mildew has long been ignored by people, but it is a very serious global problem. In the storage, lots of toxins were produced when grain mildew, these toxins have a serious threat to the health of humans and animals. In the several of mould, aflatoxin has higher toxicity than others. It harm to the health of humans is extremely serious. The major and the most poisonous is aflatoxin B1 (AFB1) which has strong acute and chronic poison and is considered as I degree carcinogen by IARC. Many methods, including good agricultural practices, chemical control and genetically modified, are used to inhibit aflatoxin. However, these methods have not been widely adopted because of the high cost without obvious effect or/and secondary pollution. After research and analysis of current packaging materials, we are design and product the new type of bag material.The ideal packing material not only has excellent strength to meet all kinds of storage requirements, should also have good barrier properties, hygroscopicity and environmental performance. According to this theory, this topic design and preparation of one kind of new composite packaging materials that can restrain the aflatoxin. This material have two part adopts that are moisture absorption layer and barrier layer, hot rolling process compound and into. Moisture absorption layer raw materials are jute fiber that has excellent hygroscopicity, then through the acupuncture and hot-rolled non-woven processing technology processing forming. Because of the multilayer composite EVOH film has good barrier performance, so it is the barrier layer. The test result, the performance of new packaging materials can meet the design requirements, such as breaking strength, through oxygen rate and wet resistance. It can effectively control the outside moisture diffusion to bags internal; keep bags relatively independent in the microenvironment.Then we analysis the inhibition of aflatoxin by the new bags material. The peanut was packing into the bag and storage, then detection of aflatoxin B1 of peanuts. According to the test result, aflatoxin B1 was detected in jute non-woven bag, but it not found in the new materials bag. Explain jute nonwoven bags couldn’t restrain the generation of aflatoxin, single nonwoven materials for bags can’t provide a good barrier properties, and new packing materials can effectively improve the overall performance of the material and effectively restrain the generation of aflatoxin. Whether extend the storage time or increase the moisture content of peanut, in the new packaging materials bags did not appear aflatoxin. The bag be made by new packaging material has good performance on inhibition aflatoxin.In the last part of the paper firstly analyzed micro environment on the influence of grain storage in theory state. We can avoid excessive breathing through control of oxygen content in bags, and avoid the food quality decline. At the same time, detection the gas composition in the bag, we can found that the gas composition of jute nonwoven bags is not any change, but in new materials bags that packing high moisture content of peanuts was found an obvious change of gas composition. Comparative relative humidity data in the bag can be found relative humidity in the new materials bags relatively smooth small changes in storage process, but the changes of relative humidity in woven bags is greatly, obviously and higher than new materials bags. Finally, we can draw the conclusion: the new packing material will be realized in a low oxygen concentration, low relative humidity and high carbon dioxide concentration in the bags with food aerobic respiration, then inhibit the generation of aflatoxin and protection of grain storage quality. |
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