利用显微镜法、激光粒度法和聚焦光束反射仪法(FBRM)等3种不同方法分析分别测定了玉米淀粉、马铃薯淀粉和木薯淀粉颗粒粒径分布,并对这3种方法进行了分析比较。结果表明:显微镜法在测定淀粉颗粒粒径时非常直观,但是重复性较差,特别是粒度范围宽的样品,在测量时就会产生较大的误差,测出颗粒粒径大小为玉米淀粉(11.2μm)<木薯淀粉(12.6μm)<马铃薯淀粉(25.7μm);激光粒度法在测定淀粉颗粒粒径时,近球形颗粒重复性好,但是对于形状不规则的样品会产生较大误差,测出颗粒粒径大小为木薯淀粉(12.0μm)<玉米淀粉(15.2μm)<马铃薯淀粉(39.3μm);聚焦光束反射仪法(FBRM)分析测定淀粉颗粒粒径时,重复性好,能较好地测量颗粒粒径分布,测出颗粒粒径大小为玉米淀粉(24.0μm)<木薯淀粉(27.3μm)<马铃薯淀粉(31.3μm),可实现对淀粉在物理或化学处理过程中粒径和数量粒径变化的在线监测。

Microscopic method,laser scattering method and Focus Beam Reflectance Measurement were applied to determine the granule diameter distribution of corn starch,potato starch and tapioca starch.The comparison study showed that microscopic method was very intuitive,but had poor repeatability,especially for wide size distribution samples.The order of starch granule diameter was:corn starch(11.2 μm)