Photometric Determination of Indolyl Glucosinolates in Seeds of Rapeseed

For the selection of rapeseed genotypes with reduced contents of indole glucosinolates a method has been developed which allows the determination of these substances with a multichannel photometer. Basis is the reaction with diazotized sulfanilic acid in the presence of o‐phosphoric acid. The red coloured coupling product has an absorption maximum at 510nm. From measuring values obtained by this method and by high pressure liquid chromatography a coefficient of correlation of r = 0.90 (N = 20) has been calculated.