Research On The Small Plastic Film Packages Of Rice During Storage

Rice is the primary food of our country. Rice storage is the important question of our coutry food safety. Solving the mainly questions of rice storage in the paper, using the milled rice of Yuexuan 4# as material and adopting the methods of modify atmosphere and control atmosphere, it mainly research that the effects of the number of mildew and quality changes of rice storage during the atomsphere packages, water contents, temperature in the rice preservation, and gain the fresh storage method, in the same time also research the effects of rice storage using different films and put forward the method of AFB1 of aging rice using HPLC.The mainly results as follow:(1) The rice fatty acid of the bianzhi packages was increased by 131% in 73 days storage, and the rice fatty acid of the vacuum packages was increased by 36.4% in 135 days storage during different atmosphere packages. The rice reducing sugar during bianzhi packages was increased to 47.6%, 37.5% in compare with the controlled atmosphere packages and the vacuum packages in 138 days. The rice viscidity of the bianzhi packages and the modify atomosphere packages was declined by 3.5 mp·s, but the rice viscidity of the vacuum packages and the controlled atmosphere packages was 6.8mp·s after 138 days storage. The vacuum pack of rice storage was the best.(2) The ratios of fatty acid and reducing sugar of rice were relation to the original water content of rice. The water contents, fatty acid and reducing sugar were relation to the storage time of rice. The rice of the lower water contents was similar to the original rice sample on the sensory character.The ratio of rice mildew of the lower water contents was the lowest,20%. The different water contents of rice storage had different quality changes. The lower water content of rice quality was the slower of quality changes.(3)In the high temperature the rice fatty acid after six monthes storage was nine times of the original value.The rice reducing sugar was 3.82 times of the original value. The quality changes of rice became slow in the low temperature and room temperature. The vacuum pack was prior to the modify atmosphere pack by the trend of the quality changes of rice storage.(4) The rice of the small package had insects and moths by the summer storage. The rice fatty acid was increased to 21.3% after 33 days storage and the redusing sugar was increased by 223% after 198 days storage. The rice packing by food special plastic film(thickness:0.08mm) was best, slower to the rice aging, and preventing the mould from the rice quality changes by the six kind films packing.(5) The mildew was the predominance of the degenerative rice. The regress equation of AFB1 of rice was y=4.09e+006x+2.25e+002, correlate coefficient R=0.999957, the relation of linearity was good. The average recovery of AFB1was 89.67%, and average variation was 5.60%. The ratio of AFB1 of rice samples was 67.24%, the ratio of overrun the country standard was 3.45%.