3. Results and discussion
3.1. Hydration capacities and bulk densities of DDG samples
Hydration capacities and bulk densities of unextracted DDGs, x-DDGs, small x-DDGs and large x-DDGs are shown in Table 1. The unextracted DDGs have both a higher bulk density and a lower hydration capacity than any of the x-DDG fractions. There were no significant differences for either hydration capacity between any of the x-DDG samples, although the large x-DDGs had a lower bulk density. There were considerably more “dusty” particles in both the nonsieved x-DDGS and in the small x-DDGs than in the large x-DDGs, but the addition of glycerol eliminated this problem. Therefore we decided to conduct further tests only on x-DDGs that had not been size separated, which would add an unnecessary processing step.