Bovine Serum Albumin

lyophilized powder, essentially fatty acid free and essentially globulin free, ≥99% (agarose gel electrophoresis)

Albumin bovine serum, Bovine albumin, BSA
CAS Number:
EC Number:
MDL number:

Quality Level

biological source



≥99% (agarose gel electrophoresis)


lyophilized powder

mol wt

~66 kDa

purified by

cold ethanol and heatshock fractionation


poly bottle of


USA origin

free fatty acid content



enzyme immunoassay: suitable


essentially globulin free
≤0.01% Fatty acids




water: soluble (40 mg/ml)

UniProt accession no.

storage temp.


Gene Information

bovine ... ALB(280717)

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General description

Bovine serum albumin (BSA) is a plasma protein with a calculated molecular weight (MW) of 66,430 Daltons (Da). The major protein in bovine serum, BSA assists in regulation of blood colloidal osmotic pressure. BSA is used in different applications such as immunochemistry, protein quantitation, and cell culture.

This BSA product is specifically tested for the following properties:
  • very low FA content / essentially fatty acid free
  • low globulin content / essentially globulin free


BSA is a known fatty acid (FA) carrier. Thus when BSA is used specifically in cell culture, control over specific FA′s used to culture cell lines is important, because different cell lines can be variably sensitive to particular fatty acids. Fatty acid-free BSA thus is useful for cell culture work, where the specific FA content must be stringently controlled, so that researchers can control the specific fatty acids needed for their particular cell lines. Fatty acid-free albumin also allows for optimal and maximum binding sites for the specific fatty acids that researchers wish to use in their particular cell culture experiments. Use of FA-free BSA also addresses concerns about endogenous FA′s potentially in non-FA-free BSA.


1, 5, 10, 100 g in poly bottle
100, 250 mg in poly bottle

Biochem/physiol Actions

Certain conformational and primary-sequence epitopes of BSA are suspected allergens in human beef and milk allergies.

Features and Benefits

  • Essentially fatty acid-free
  • Essentially globulin-free

Preparation Note

Purified by a combination of heat shock and ethanol fractionation
Serum albumin may be referred to as Fraction V. This naming convention is taken from the original Cohn method of fractionating serum proteins using cold ethanol precipitation. Serum albumin was found in the fifth ethanol fraction using Cohn′s method. Since then, the term "Fraction V" has been used by some to describe serum albumin regardless of the method of preparation. Others have used this term to describe serum albumin purified by ethanol fractionation methods that have been highly modified since the original Cohn method was described. Sigma-Aldrich manufactures and distributes serum albumins purified from a variety of primary methods including the true Cohn fractionation method, modified ethanol fractionation methods, heat shock and chromatography. Additional purification steps may include crystallization or charcoal filtration.


11 - Combustible Solids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Felipe A Navarrete et al.
Frontiers in cell and developmental biology, 7, 262-262 (2019-11-22)
To become fertile, mammalian sperm must undergo a series of biochemical and physiological changes known as capacitation. These changes involve crosstalk between metabolic and signaling pathways and can be recapitulated in vitro. In this work, sperm were incubated in the...
Cheryl M Zajd et al.
Frontiers in immunology, 11, 269-269 (2020-03-11)
Macrophages are a heterogeneous and plastic population of cells whose phenotype changes in response to their environment. Macrophage biologists utilize peritoneal (pMAC) and bone marrow-derived macrophages (BMDM) for in vitro studies. Given that pMACs mature in vivo while BMDM are...
Bidur Paudel et al.
Biology of reproduction, 100(2), 440-454 (2018-09-22)
Mammalian sperm undergo a series of biochemical and physiological changes collectively known as capacitation in order to acquire the ability to fertilize. Although the increase in phosphorylation associated with mouse sperm capacitation is well established, the identity of the proteins...
Noriko Kondo-Okamoto et al.
Molecular biology of the cell, 17(9), 3756-3767 (2006-06-23)
Although it is clear that mitochondrial morphogenesis is a complex process involving multiple proteins in eukaryotic cells, little is known about regulatory molecules that modulate mitochondrial network formation. Here, we report the identification of a new yeast mitochondrial morphology gene...
Viviana I Risca et al.
Proceedings of the National Academy of Sciences of the United States of America, 109(8), 2913-2918 (2012-02-07)
Mechanical cues affect many important biological processes in metazoan cells, such as migration, proliferation, and differentiation. Such cues are thought to be detected by specialized mechanosensing molecules linked to the cytoskeleton, an intracellular network of protein filaments that provide mechanical...

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