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The test is based on the interaction of spin-labeled fatty acids with serum albumin by means of EPR spectroscopy. [1] [2] [3] A sample of blood serum is subjected to a spin probe 16-doxyl stearate. Spin probe molecules bind specifically to albumin molecules where they occupy two main positions:
Albumin transports hormones, fatty acids, and other compounds, buffers pH, and maintains oncotic pressure, among other functions. Albumin is synthesized in the liver as preproalbumin, which has an N-terminal peptide that is removed before the nascent protein is released from the rough endoplasmic reticulum.
CSF/serum albumin ratio is a test performed to compare the levels of albumin in the cerebrospinal fluid and the serum. It is useful as a measure of the integrity of the blood–brain barrier . [ 1 ] [ 2 ] [ 3 ]
Serum albumin, often referred to simply as blood albumin, is an albumin (a type of globular protein) found in vertebrate blood. Human serum albumin is encoded by the ALB gene . [ 2 ] [ 3 ] [ 4 ] Other mammalian forms, such as bovine serum albumin , are chemically similar.
CSF albumin is a measurement used to determine the levels of albumin in cerebrospinal fluid. [1] A closely related test, CSF total protein is a measurement used to determine the levels of protein in cerebrospinal fluid. [2] [3] It combines the albumin, IgG, and other proteins. It can be useful in distinguishing among causes of Meningitis.
For instance, albumin nanoparticles can enhance BBB permeability, increase solubility, and increase half-life in circulation. Patients who have brain cancer overexpress albumin-binding proteins, such as SPARC and gp60, in their BBB and tumor cells, naturally increasing the uptake of albumin into the brain.
Oncotic pressure strongly affects the physiological function of the circulatory system. It is suspected to have a major effect on the pressure across the glomerular filter. However, this concept has been strongly criticised and attention has shifted to the impact of the intravascular glycocalyx layer as the major player. [2] [3] [4] [5]
Albumin is a family of globular proteins, the most common of which are the serum albumins. All of the proteins of the albumin family are water- soluble , moderately soluble in concentrated salt solutions, and experience heat denaturation .