NF V03-703

Le présent document décrit une méthode de détermination du niveau d'activité alpha-amylasique des blés tendres, des seigles et de leurs farines ainsi que des blés durs et leurs semoules, par la méthode dite de l'indice de chute selon Hagberg-Perten. Il tient compte des récents travaux menés sur le même sujet, dans le cadre de l'Association internationale des sciences et technologies céréalières (ICC).

ISO 3093:2004 describes the determination of the alpha-amylase activity of cereals by the Falling Number method according to Hagberg-Perten. This method is applicable to cereal grains, in particular to wheat and rye and their respective flours, durum wheat and its semolina. For the purposes of ISO 3093:2004, the term "flour" includes semolina and ground grain (wholemeal), the particle sizes of which are defined. This method is not applicable for the determination of low levels of alpha-amylase activity, which can be carried out in accordance with ISO 7973. By converting the Falling Number into a Liquefaction Number (LN), it is possible to use this method to estimate the composition of mixtures of grain, flour or semolina with known Falling Number values necessary to produce a sample of a required Falling Number.