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See Chinese contents: GB 5009.89-2016 GB 5009.89-2016: National Food Safety Standard -- Determination of Niacin and Nicotinamide in Foods
This Standard specifies the determination method for niacin and nicotinamide in foods. In this Standard, method I is microbiological method, which is applicable for the determination of the total content of niacin and nicotinamide in all types of foods including fortified foods using natural foods as the base. Method II is high performance liquid chromatography, which is applicable for the determination of acid and nicotinamide in fortified foods.
