Figure 1. Diagram of crude aqueous extract preparation.

(A) Some seeds require processing to remove inedible components like the husk. Flax and chia seeds are consumed unprocessed, while sunflower and hemp seeds are commonly consumed as kernels (k) where the indigestible hull/husk (h) is removed (hulled sunflower and hulled hemp). Hemp is also consumed as a flour where oil and crude protein have been extracted for other products (hemp flour). (B) These forms of the seeds are the most commonly consumed and were the starting material for extraction. (C) Except hemp flour, seeds were ground (gr) to flour. (D) Four g of seed flour was extracted in body temperature (37 °C) water for 3 h with intense agitation. (E) Debris was pelleted by centrifugation and the aqueous extracts were decanted and dried. (F) Dried extracts were weighed and compared against the starting material to determine the aqueous extract yield.