Sakai Y, Itakura K, Kanada T, Ebata N, Suga K, Aikawa H, Nakamura K, Sata T
Anal Biochem. 1984 Feb;137(1):1-7. doi: 10.1016/0003-2697(84)90337-3.
Apolipoprotein A-I was released from human HDL particles by treatment with 8 M urea, and the free apolipoprotein exhibited identical antigenicity and the same low mobility as purified apolipoprotein A-I in electrophoresis. Treatment of serum with 8 M urea enabled enabled quantitation of apolipoprotein A-I by single radial immunodiffusion assay, as judged by comparison with sodium dodecyl sulfate-polyacrylamide gel electrophoresis.