Sample preparation
The bean samples were the only crop that was soaked in water
overnight prior to homogenizing it for extraction. The corn samples
were shaved from the cob with a knife prior to the addition
of water. The sugar beet pulp and skin was cut into 3-4 pieces
with a knife and grated with a hand-held vegetable grater prior
to the addition of water. Potato pulp and potato skin were analyzed
separately. The skin was peeled from the potato pulp, and
the potato pulp was cut and grated in the same manner as the
sugar beet.