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Preparation of protein concentrates from symphytum asperrimum russian comfrey for nonruminant feeds and human foods

, : Preparation of protein concentrates from symphytum asperrimum russian comfrey for nonruminant feeds and human foods. Food Chemistry 7(2): 109-116

Extracts were prepared from fresh Russian comfrey plants by successive extractions with water and NaOH. Almost 55% of crop dry matter and 69% of crop crude protein were extracted. The extracts were then acidified to produce precipitates that contained 21.7% of crop dry matter and 52.6% of crop crude protein. The crude protein in these precipitates was > 90% true protein; it is suggested that such concentrates may prove to be valuable as non-ruminant feeds. The solid residues, containing 11-12% of crude protein, may be usable as feed for beef cattle. Large quantities (33%) of crop dry matter remain in the supernatants following precipitation at low N levels (6.9%) and would probably be usable for microbial protein production following enrichment with a N source.

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