温度对高水分稻谷储藏品质的影响及其预测模型研究

Effect of Temperature on Storage Quality of High-Moisture Paddy and Its Prediction Model

为了解水分含量大于18%时稻谷解吸过程品质的变化,本文探索了高水分稻谷在不同温度(35、25、15℃)条件下品质变化规律,以脂肪酸值作为稻谷品质劣变指标,建立品质变化的预测模型,预测稻谷脂肪酸值变化规律。研究结果表明:随着温度的升高,稻谷水分含量下降,稻谷脂肪酸值、稻米硬度与稻米胶着度升高,弹性随时间的增加呈现先上升后下降趋势,稻谷加工品质均呈现上升趋势;对比三个温度条件,高水分稻谷在35℃品质劣变速度加快,15℃可减缓其品质劣变速度。同时,得到高水分稻谷脂肪酸值变化规律的预测模型为:lnA=0.0193e^(409.09/T)·t+lnA_0,且通过该预测模型得到的预测值与实测值之间相对误差小于10%,低于一般数值模拟的15%精度要求,该预测模型可信。

In order to understand the quality change of rice during the desorption process when the water content was greater than 18%,this paper explored the quality change law of high-moisture rice at different temperatures(35,25,15℃).A prediction model for quality change was established to predict the change law of rice fatty acid value,fatty acid value was used as an indicator of rice quality deterioration.The results showed that:As the temperature rised,the moisture content of the rice decreased,simultaneously,the fatty acid value of the rice,the hardness of the rice,and the gelatinity of the rice increased.With the increase of time,the elasticity showed an upward and then a downward trend,and rice processing quality was on the rise.At three temperature conditions,the quality of high-moisture rice deteriorated faster at 35℃,and 15℃could slow down the quality deterioration.At the same time,the prediction model for the change of fatty acid value of high-moisture rice was:lnA=0.0193e409.09/T·t+lnA0,and the relative error between the predicted value and the measured value obtained by the prediction model was less than 10%,which was lower than 15%accuracy requirements for general numerical simulation,the prediction model was credible.