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通过标准碘比色法与改良碘比色法的比较认为改良碘比色法的优点是:既可测定精米粉或糙米粉等粉体材料也可测定精米粒和糙米粒等粒体材料,能将样品的直链淀粉更完全地分离出来,测试误差小,但需时间较长。相同品种不同类型样品直链淀粉的含量测定结果:精米粒>精米粉和糙米粒>糙米粉。测试精米粒或精米粉时宜选择强碱 KOH,而测试糙米粒或糙米粉时宜选择强碱 NaOH。样品量以100mg 为宜,但不足100mg 时进行品种间的比较仍可考虑采用。
The comparison between standard iodine colorimetric method and modified iodine colorimetric method shows that the improved iodine colorimetric method has the following advantages: it can not only measure the powder material such as polished rice flour or brown rice flour, but also measure the granular materials such as polished rice grains and brown rice grains, The sample amylose more completely separated, the test error is small, but takes longer. Amylose content determination results of different types of samples of the same variety: polished rice grain> polished rice grain and brown rice grain> brown rice flour. When testing the quality of polished rice or polished rice should choose strong base KOH, and brown rice or brown rice testing should choose strong alkali NaOH. Sample amount of 100mg is appropriate, but less than 100mg when the comparison between varieties can still be considered.