Protein components of lipoprotein apoproteins . Some apoproteins interact with cellular receptors . Some as activators and inhibitors of enzymes involved in lipoprotein metabolism . ApoB48 controls the metabolism of chylomicrons. ApoE plays an essential role in the metabolism of remnant particles.
Lipoprotein particles contain a hydrophobic core of cholesterol esters and triglycerides .
Others , apoC , can be easily exchanged between different particles . Dietary fat enters the small intestine , emulsified by bile salts . Lipase secreted by the pancreas . Fatty acids and 2-monoacylglycerols intestinal epithelial cells and reconverted to triacylglycerols . Pancreatic Lipase Major enzyme that digests dietary triacylglycerols is a pancreatic lipase.