The technique to measure particle size distributions has a wide variety of applications in food industry. This report refers to a series of investigations carried out to evaluate the efficiency and reliability of this technique. First, we measured the differences in particle size distributions of milk samples of different brands, of those of the same brand, but produced in different factories, and of those of the same brand and produced in the same factory, but stored for different number of days after production. Next, we measured the particle size distributions of two types of canned coffees, that had been kept under different conditions. The measurements were carried out by the normal concentration method and the high concentration method using one of the Shimadzu SALD Series laser diffraction particle size analyzers. The measurement by the normal concentration method gave no significant difference in data between the two samples, but the measurement by the high concentration method presented significant difference between them, as expected. These results demonstrate the efficiency and reliability of the high concentration method utilized in the Shimadzu SALD Series particle size analyzers.
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