Influence of packaging materials on storage property of peanut under normal temperature

In order to study the influence of packaging materials on storaged peanut at normal temperature, the paper investigated the effects of commonly-used 3 types of packaging materials on peanut’s color, moisture content, conductivity, germination percentage, Aspergillus flavus infection index and insecticidal effect. The results showed that the packaging materials had notable influences on peanut’s storage quality index. The seed coat color change rate of peanut packaged in plastic film bag was slower than that in woven bag and sack. Meanwhile, the strong water-preservation ability of plastic film bag enabled itself to effectively prevent against water evaporation of peanuts. However, at the initial stage of storage, the closed package environment of plastic film bag can cause anaerobic respiration which will damage the cell membrane structures of seed coat and embryo, and leads to sharp increase of conductivity. The seed coat is an important barrier of peanut to prevent itself from being infected by Aspergillus flavus. Therefore, the anti-infection ability of peanut packaged in plastic film bag was worse than that in woven bag and sack. The germination percentage of peanut packaged in woven bag and sack was a bit higher than that in plastic film bag. The 3 types of packagings had significant difference in restraining insect pests. The peanuts packaged in highly-permeable woven bag and sack suffer serious invasion from insect pests, while in plastics film bag it can effectively prevent infection. In a conclusion, the change of peanut quality is a dynamic and complex process, which requires to comprehensively considering the peanut’s physiological characteristics and storage environment before choosing a proper packaging material. The research can provide a reference for peanut storaged at normal temperature.