ISO 6557-1:1986 Preview
Fruits, vegetables and derived products -- Determination of ascorbic acid -- Part 1: Reference method
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
The method uses the molecular fluorescence spectrometry for the determination of the combined ascorbic and dehydroascorbic acid content. It consists in transforming ascorbic acid into dehydrascorbic acid using activated charcoal, and reacting this with o-phenylendiamine (OPDA).