不同储藏年限稻谷的蒸煮特性及其米饭的食味和质构特性分析

    Analysis of the cooking quality of rice after different storage periods and the taste quality and texture characteristics of the cooked rice

    • 摘要: 为了探讨不同储藏年限稻谷的蒸煮特性及其米饭的食味和质构特性的变化情况,选用不同储藏年限的籼稻、粳稻各40份为原料,对其蒸煮品质、食味品质及质构特性进行测定,采用SPSS 20.0对数据进行描述性统计分析和主成分分析。结果表明:随着储藏年限的延长,两种稻谷的吸水率和膨胀体积均升高,籼稻膨胀体积上升趋势明显,粳稻膨胀体积上升趋势平缓;米汤的pH值、碘蓝值、固形物均下降,且下降趋势基本一致。总体上,米饭食味品质变差,其中,随着储藏年限的延长,感官评分均呈降低趋势,在储藏4 a时,籼稻谷有60%的样品达到轻度不宜存的程度,而粳稻谷有90%的样品达到了轻度不宜存的程度。质构特性中硬度、咀嚼性逐渐增大,籼稻黏着性呈上升趋势,粳稻黏着性下降,其他变化不明显。从主成分分析可看出,籼稻中的吸水率、膨胀体积、感官评分、碘蓝值、pH值在储藏过程中变化较为明显,粳稻中的感官评分、固形物、pH值、黏着性在储藏过程中变化较为明显。

       

      Abstract: In order to investigate the changes in the cooking property of rice after different storage periods and the taste quality and texture characteristics of the cooked rice, 40 kinds of indica and japonica rice with different storage periods were selected, and their cooking property, taste quality and texture characteristics were measured. The data were analyzed by SPSS 20.0 for the descriptive statistical analysis and principal component analysis. The results showed that the water absorption and swelling volume of two types of rice increased with the increase of storage time, the upward trend in swelling volume of indica rice was higher than that of japonica rice; however, pH value, iodine value and solid matter of rice soup all decreased, and the downward trend was basically the same. The taste quality of rice generally deteriorated, and the sensory scores showed a decreasing trend as the storage time prolonged. After 4 years of storage, 60% of the indica rice samples were mildly unsuitatble for further storage, and 90% of the japonica rice samples reached that level. For the texture characteristics of cooked rice, hardness and chewiness increased gradually, the adhesiveness of indica rice increased, japonica rice decreased, and other changes were not obvious. The principal component analysis showed that the water absorption, swelling volume, sensory score, iodine value and pH value of indica rice changed significantly during storage. The sensory score, solid content, pH value and adhesiveness of the japonica rice changed more obviously during storage.

       

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