Published online by Cambridge University Press: 29 January 2018
Human blood plasma normally contains 500–1,000 mg./100 ml. of lipid material kept in solution by complex formation in various proportions with protein to form lipoproteins of definite size and constitution. Apart from the chylomicrons at least four β-lipoproteins and two α-lipoproteins are recognized, differing from each other in density. The α-lipoproteins correspond to the α-globulins and the β-lipoproteins to the β-globulins as determined by paper electrophoresis. The various lipoproteins have been shown to possess a constant and characteristic pattern both in protein: lipid ratio and in the relative proportions of phospholipid, sterol, sterol esters and glycerides (Jones et al, 1951; Bragdon et al., 1956). The proportions in which the fatty acids are present have also been shown to be constant (Lindgren et al., 1959).
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