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A7888

Sigma-Aldrich

Bovine Serum Albumin

heat shock fraction, suitable for RIA, pH 5.2, ≥96%

Synonym(s):

Albumin bovine serum, BSA, Bovine albumin

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About This Item

CAS Number:
EC Number:
MDL number:
UNSPSC Code:
12352202
NACRES:
NA.27

biological source

bovine

Quality Level

grade

RIA grade

assay

≥96%

form

lyophilized powder

quality

suitable for RIA

mol wt

~66 kDa

purified by

heat shock fractionation

packaging

poly bottle of

origin

USA origin

technique(s)

blood typing: suitable

loss

≤5%

pH

5.2

solubility

water: soluble (40 mg/ml)

suitability

suitable for insulin RIA procedures

UniProt accession no.

foreign activity

BT virus, none detected
VSV virus, none detected

storage temp.

2-8°C

Gene Information

bovine ... ALB(280717)

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General description

Bovine serum albumin (BSA) is 66 kDa protein consisting of three domains with two subdomains under each. It is α-helical globular and a non-glycosylated protein.

Application

Bovine Serum Albumin has been used:
  • as a blocking agent in enzyme linked immunosorbent assay (ELISA)(154)
  • as a component of Dulbecco PBS medium for preantral follicles culture(155)
  • as a component of modified Tris-buffered medium (mTBM) for oocyte insemination(156)

Biochem/physiol Actions

Bovine Serum Albumin (BSA) is a transporter for drugs, hormones and fatty acids. It is a blocking agent used in enzyme linked immunosorbent assay (ELISA) for preventing non-specific binding of antigens and antibodies to the microtiter plates. The cysteine and tyrosine residues of BSA have high affinity for metal binding.
Certain conformational and primary-sequence epitopes of BSA are suspected allergens in human beef and milk allergies.

Features and Benefits

  • Heat shock fractionated
  • Suitable for radioimmunoassay (RIA)

Caution

May yield an insulin blank of up to 0.1 μunit per mg in certain procedures.

Preparation Note

Prepared using heat shock 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.

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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