稻谷储藏过程中理化特性变化的研究

根据现有国标稻谷储存控制指标角度研究了不同年份储藏稻谷的粘度、脂肪酸值、发芽率、发芽势的变化曲线，还研究了不同年份储藏稻谷的脂肪氧化酶Lox-3活性、直链淀粉的含量、胶长、酸度、碱消值、电导率、丙二醛的含量、含水量的变化规律，并对所测定的项目指标进行统计分析，获得各项指标的相关系数。结果表明：储藏稻谷中，粘度、脂肪酸值、发芽率、脂肪氧化酶Lox-3活性、直链淀粉的含量、酸度、电导率、丙二醛呈显著相关。随着储藏时间延长，粘度、脂肪氧化酶Lox-3活性、发芽率、发芽势、直链淀粉含量均下降；而脂肪酸值、酸度、丙二醛的含量、电导率则明显增加；胶长、碱消度无明显的变化。研究稻谷储藏过程中理化特性的变化，目的在于探索稻谷耐储藏评价的新的理化指标。

Study on Physical and Chemical Characters in Rice Storage

According to indexes of the paddy storage deterioration set in the National Standards,the changes of the viscosity,content of free fatty acid (FFA),and germination percentage of rices stored for different years were investigated;and the laws of change of lipoxygenase-3 activity,amylose content,gel consistency,acidity,Asv,conductivity,malondiadehyde(MDA) level,and water content of the stored rices were studied.The results demonstrated the significant corelation level among the gel consistency,content of free fatty acid (FFA),germination percentage,lipoxygenase-3 activity,amylose content,gel consistency,acidity,conductivity,and malondiadehyde(MDA) level of the stored rices.With the storage time prolonging, the viscosity,lipoxygenase-3 activity,germination percentage,germination trend ,and amylose content,decreased,but the content of free fatty acid (FFA),acidity,malondiadehyde(MDA) level and conductivity increased significantly,and there were no significant change in the gel consistency (GC)and Asv.These data are useful for development of a new index system to evaluate of rice storage stability.