Recent times have reported an increase a problem about production center camouflage or freshness such as beef, rice, grains and vegetables, and so on. By a DNA analysis or a genetic test the distinction of production center will be available. But it will cost much, it will take longer time to inspect, it is a destructive testing, therefore it is difficult to inspect all quantity of those. In this paper, we chose "soy beans" as a sample. Soy beans are very familiar with Japanese people. Japanese consumes soy beans as soy source, tofu, miso (including miso-soup), or natto and so on. There are many quantities of imported soy beans form foreign country. This may cause the production center camouflage problem. We have examined about the fluorescence light by irradiating UV light to the soy beans. We found fluorescence spectrum shows specific feature to each sample. To investigate deeply, excitation emission matrix (hereafter EEM) measurement is effective and important. From the results of each EEM, features are specific to the sample. This means that the difference of production center of sample may cause the difference of EEM feature. These results could be combined with the production center of those. We will discuss it here.
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