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5-dibromo-2- pyr- idylazo)-N-ethyl-N-sulfopropylaniline (PAESA)
Limit of detection: 3 mg/l (ppm)
Ascorbic acid is a compound found in ripe grapes at very low levels compared with other acids (30-60 mg/L)
Limit of linearity: 150mg/L
high levels can lead to micro- bial instability and production of ethyl carbonate
Primary Amino Nitrogen (PAN) Colorimetric 5-dibromo-2- pyr- idylazo)-N-ethyl-N-sulfopropylaniline (PAESA)Colorimetric analysis for primary amino nitrogen determination Kit volume: 100 ml Method: Two reagent differential at 340 nm Limit of linearity: 400 mg l Limit of detection: 1 mg l (ppm) Advantages Stable liquid reagent until the expiration date Stable working reagent for 12 months Ready to use dedicated reagent Liquid calibrator included in the kit Nitrogen compounds (molecules containing a primary amine nitrogen) in must and wine play a key role in
