Biomaterial Database

Influence of guanidination on apparent ileal amino acid digestibility in some protein sources for broilers. 1998

V Ravindran, and L I Hew, and W L Bryden

Department of Animal Science, The University of Sydney, Camden, NSW, Australia. velmurug@camden.usyd.edu.au

High pH employed during the guanidination process (conversion of lysine residues to homoarginine) and its possible effects on racemization of amino acid residues to D-forms and on amino acid digestibility are concerns often raised with the use of guanidinated proteins to estimate endogenous amino acid losses in monogastric animals. The objective of the present study was to investigate the influence of guanidination on apparent ileal amino acid digestibility of casein, soybean meal, cottonseed meal, and canola meal for broiler chickens. Apparent ileal digestibility of amino acids in guanidinated and unreacted proteins, with few exceptions, were found to be remarkably similar. These results suggest that the guanidination process has no influence on the susceptibility of proteins to proteolysis and that racemization is not a practical problem when the proteins are guanidinated at low temperatures.

UI	MeSH Term	Description	Entries
D007082	Ileum	The distal and narrowest portion of the SMALL INTESTINE, between the JEJUNUM and the ILEOCECAL VALVE of the LARGE INTESTINE.
D007536	Isomerism	The phenomenon whereby certain chemical compounds have structures that are different although the compounds possess the same elemental composition. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)	Isomerisms
D008239	Lysine	An essential amino acid. It is often added to animal feed.	Enisyl,L-Lysine,Lysine Acetate,Lysine Hydrochloride,Acetate, Lysine,L Lysine
D002364	Caseins	A mixture of related phosphoproteins occurring in milk and cheese. The group is characterized as one of the most nutritive milk proteins, containing all of the common amino acids and rich in the essential ones.	alpha-Casein,gamma-Casein,AD beta-Casein,Acetylated, Dephosphorylated beta-Casein,Casein,Casein A,K-Casein,Sodium Caseinate,alpha(S1)-Casein,alpha(S1)-Casein A,alpha(S1)-Casein B,alpha(S1)-Casein C,alpha(S2)-Casein,alpha-Caseins,beta-Casein,beta-Caseins,epsilon-Casein,gamma-Caseins,kappa-Casein,kappa-Caseins,AD beta Casein,Caseinate, Sodium,K Casein,alpha Casein,alpha Caseins,beta Casein,beta Caseins,beta-Casein Acetylated, Dephosphorylated,beta-Casein, AD,epsilon Casein,gamma Casein,gamma Caseins,kappa Casein,kappa Caseins
D002645	Chickens	Common name for the species Gallus gallus, the domestic fowl, in the family Phasianidae, order GALLIFORMES. It is descended from the red jungle fowl of SOUTHEAST ASIA.	Gallus gallus,Gallus domesticus,Gallus gallus domesticus,Chicken
D003369	Cottonseed Oil	Oil obtained from the seeds of Gossypium herbaceum L., the cotton plant. It is used in dietary products such as oleomargarine and many cooking oils. Cottonseed oil is commonly used in soaps and cosmetics.	Cottonseed,Cottonseed Oils,Cottonseeds,Oil, Cottonseed,Oils, Cottonseed
D004044	Dietary Proteins	Proteins obtained from foods. They are the main source of the ESSENTIAL AMINO ACIDS.	Proteins, Dietary,Dietary Protein,Protein, Dietary
D004063	Digestion	The process of breakdown of food for metabolism and use by the body.
D006146	Guanidines	A family of iminourea derivatives. The parent compound has been isolated from mushrooms, corn germ, rice hulls, mussels, earthworms, and turnip juice. Derivatives may have antiviral and antifungal properties.
D006709	Homoarginine