This standard specifies the spectrophotometric method for ascorbic acid in food. This standard applies to the determination of reduced ascorbic acid in various foods. This standard does not apply to the determination of dehydroascorbic acid.
GB/T 5009.159-2003 history
2016GB 5009.86-2016 Determination of Ascorbic Acid in National Food Safety Standard Food
2003GB/T 5009.159-2003 Determination of reductive--form ascorbic acid in foods
GB/T 5009.159-2003 Determination of reductive--form ascorbic acid in foods was changed to GB 5009.86-2016 Determination of Ascorbic Acid in National Food Safety Standard Food.