Apolipoprotein B Human Plasma Low-Density Lipoprotein (Apo B Apo B-100). Solid lyophilized from 50 mM Na2CO3 50 mM NaCl 10 mM sodium deoxycholate pH 10.0. Mean serum concentration: 950 mg/ml. Dominant protein constituent of LDL and also present in VLDL.