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The Japanese official analysis method for determination of nitrate ions in food products used as food additives is associated with various challenges. In some kinds of cheese, the extract becomes suspended. The volume of extracted solution is often not accurate owing to the presence of residues in the solution. Moreover, the determination with liquid chromatography-ultraviolet detection (HPLC-UV) is difficult owing to the influence of impurities. Sake usually does not contain lipids or proteins ; therefore, its analysis can be simplifi
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