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A method for simultaneous determination of fat-soluble vitamins in animal products is presented. Milk, and two fish products containing many ingredients, were used as test materials. The vitamins determined were tocopherols, β-carotene, all-trans-retinol and in the case of fish, cholecalciferol. The sample preparation procedure, consisting of saponification and extraction by n-hexane–ethyl acetate...
The purpose of the present study was: (1) to determine net (true) protein (NP) values as sums of amino acid residues and to compare them with crude protein (PA) values; and (2) to calculate the nitrogen-to-NP conversion factors by means of linear regression analyses between the NP values and nitrogen content. The differences between NP and PA values varied between food groups. The NP values in milk...
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