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See Chinese contents: GB 5009.290-2023 GB 5009.290-2023: National food safety standard - Determination of Vitamin K2 in foods
This standard specifies the liquid chromatography method for the determination of menaquinone-4, menaquinone-7, and menaquinone-9 content in food. This standard is applicable to the determination of the three vitamin K2 types of menaquinone-4, menaquinone-7, and menaquinone-9 in milk and dairy products, special dietary foods, fermented soy products, and meat and meat products.
