title: Separation of lipid-free egg yolk proteins by high-pressure liquid chromatography using solvents containing formic acid.
abstract: A method for obtaining total protein patterns from lipid-containing systems, in particular egg yolk, is described. After dispersion of the yolk in 8 M guanidine hydrochloride solution, lipid is removed by extraction with chloroform-methanol and petrol. The protein solution is applied to a high-pressure liquid chromatograph and eluted with a gradient of formic acid, isopropanol, and acetonitrile. In measurements on a known yolk protein, duck apovitellenin I, the method did not cause irreversible formylation of N-terminal or other residues. The method was used (1) to compare protein patterns of whole yolk from hen and quail eggs; (2) to isolate and partially sequence quail apovitellenin I; and (3) to compare protein patterns of "white yolk" and "yellow yolk."
authors.affiliation: ICI-Kortec Pty Ltd, NSW, Australia.
authors.forename: D D
authors.initials: DD
authors.lastname: Sheumack
authors.forename: R W
authors.initials: RW
authors.lastname: Burley
mesh_terms: D000818:Animals; D002645:Chickens; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003370:Coturnix; D004527:Egg Proteins / Q000302:isolation & purification*; D004531:Eggs; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D005260:Female; D005561:Formates; D008055:Lipids; D012997:Solvents
chemical_list: D004527:Egg Proteins; D005561:Formates; D008055:Lipids; D012997:Solvents