Study On Quality Change Of Paddy During Different Storage Codition

Solving the mainly questions of paddy storage in different condition,using the fresh paddy gained in 2008 as material and adopting the methods of control atmosphere. it mainly research that the effects of quality changes of paddy storage during the oxygen concentration, moistrue content, temperature in the paddy preservation in the same time also analyse the paddy odor by using electronec nose The mainly results as follow(1) The paddy moisture content was slowly descend in 150 days storage.the paddy moisrure content change unconspicuous at different concentration of oxygen (5%,10%,15%,21%).but the characteristics of RVA profile have distinctness difference.The peak viscosity increased 405cp at 21% concentration of oxygen,and the peak viscosity increased 368cP at 5%concentration of oxygen The consistence was increased by 63.2% at 21% concentration of oxygen,and the consistence was increased by 40.98% at 5% concentration of oxygen .Fill gas adjustment preserve is have unconspicous on moisture content, fatty acid, characteristics of RVA profile.(2) The paddy quality have conspinuous difference in different temperature(30℃,25℃,20℃,15℃),The paddy fatty acid was increased 25.9,27.1,17.01,15.03 mgKOH/100g in 150 days storage peak viscosity increased 249,112 cP.set back increased 434,77cP.final viscosity increased 824,112cP. Carry through the othermess test on peak viscosity,final viscosity and consisence The respective results was P=0.004,0.017,0.022 the slower of quality change of paddy at lower tempature.(3) The paddy quality have conspinuous difference with different moisture content .the paddy of different initial moisture content(15.5%,14.5%,13.6%,12.5%) was slowly descend In 150 days the paddy at 15.5%,14.5% 13.6%,12.5%were reduced by1.7%,1.77%,1.27%,0.7%. The fatty acid of paddy at 15.5%,14.5%,13.6%,12.5% were increased 27.17,22.59,19.08,19.01mgKOH/100g in 60d～75d storage Carry through the othermess test on peak viscosity,final viscosity and consisence The respective results was P=0.004,0.017,0.022 .the difference was unconspinuous(4) An investigation was made to evaluate the quality of paddy by E～nose during different storage condition The distance of rice of different concentration of oxygen increased 1.66,1.67,1.62,,1.63 in 120 days storage the difference of concentration of oxygen have unconspicuous affect on the distance The distance of rice of different tempture increase 1.63,1.58,1.21,1.50 the difference of tempture have a certain extent affect on the distance the distence of rice of different moisture content increased 1.70,1.62,1.16,0.95.the difference of moisture content have conspicuous affect on the distance...