The proportion of water soluble proteins was analysed in SPH to 293 g/kg as-fed, i.e. 85% of the total amount of CP. The
molecular weight distribution of the water solubilised protein fraction in SPH showed a fraction of 81% below 1000 Da, a
fraction of 14% between 1000 and 10,000 Da, and a fraction of 5% above 10,000 Da. This indicates that the majority of the
protein fraction was in the form of di-, tri- and oligo peptides as well as free amino acids.