Fructosamine is a compoun which can be considered as the result of a reaction between fructose and ammonia or an amine (with a molecule of water being released). A fructosamine is also formed when carbonyl group of glucose reacts with an amino group of a protein, as the double bond to oxygen moves from the end carbon atom to the next carbon atom and water is released. Fructosamines formed from blood proteins such as serum albumin are known as Glycated Serum Protein (GSP) or Glycated Albumin, and are used to identify the plasma glucose concentration over time and so assess diabetic control.