Division IV INTERPRETATION OF THE CHROMATOGRAM

If the chromatogram shows a single main brightly coloured band with an Rf of about 0,4 to 0,5, the wheat used for the manufacture of the pasta in question is durum wheat. If, on the other hand, two main bands of equal brightness appear, the raw material used is common wheat. Mixtures of durum wheat and common wheat can be assessed by an evaluation of the relative brightness of the two bands.

If there are three bands (two bands at the height where the main bands for common wheat are to be found, with a further band between them) eggs have been added to pasta. In this case, the raw material used is durum wheat if the middle band is brighter than the upper band. On the other hand, if the upper band is brighter than the middle band, the raw material used is common wheat.