Casein from bovine milk

suitable for substrate for protein kinase (after dephosphorylation), purified powder

CAS Number:
EC Number:
MDL number:

Quality Level

biological source

bovine milk


purified powder


activity assay: suitable
electrophoresis: suitable
immunocytochemistry: suitable


280 °C (dec.) (lit.)


suitable for substrate for protein kinase (after dephosphorylation)

UniProt accession no.

InChI key


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General description

Casein from bovine milk is a phosphoprotein. There are four main types of Casein which make up approximately 80% of the total protein in bovine milk: α-s1 Casein, α-s2 Casein, β-Casein, and κ-Casein. Casein is proposed to be the main protective constituent in milk.


Casein from bovine milk has been used:
  • to prepare casein hydrolysates
  • as a calibrating substance in biuret colorimetric method
  • as a supplement in nutrient agar for the determination of protease activity
  • to prepare protein-enriched diet for independent replicate lines of D. melanogaster


500 g in poly bottle
1 kg in poly bottle
5 kg in poly drum

Biochem/physiol Actions

Partial gastrointestinal digestion of casein is a rich source of bioactive peptides, such as β-casomorphin. However, bovine casein is not homogeneous; variants A1 and B do lead to production of β-casomorphin 7 production, while A2 does not.


13 - Non 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

  1. How does the storage temperature relate to shipping conditions?

    The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment. See Shipping and Storage for more information.

  2. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  3. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  4. How do I find price and availability?

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  5. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  6. What is the composition of Product C5890, Casein from bovine milk?

    The approximate casein composition of milk in grams per Liter is: alpha-s1 (12-15); alpha-s2 (3-4); beta (9-11); and kappa (2-4).

  7. What is the molecular weight of the casein subunits in Product C5890, Casein from bovine milk?

    The alpha-s1 = 22-23.7 kDa, alpha-s2 = 25 kDa, beta = 24 kDa and kappa = 19 kDa.

  8. What is Product C5890, Casein from bovine milk, soluble in?

    Casein is not water soluble. It can be suspended in 1 M sodium hydroxide at a concentration of 50 mg/mL, yielding a turbid, faint yellow solution.

  9. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Effect of milk hydrolysates on inflammation markers and drug-induced transcriptional alterations in cell-based models
Nielsen D, et al.
Journal of Animal Science, 90(suppl\_4), 403-405 (2012)
Determination of the protein content in rice by the digital chromatic method
SUN JP, et al.
Journal of Food Quality, 31(2), 250-263 (2008)
Esterase and protease activities of Bacillus spp. from afitin, iru and sonru; three African locust bean (Parkia biglobosa) condiments from Benin
Azokpota P, et al.
African Journal of Biotechnology, 5(3), 265-272 (2006)
N D Richert et al.
The Journal of biological chemistry, 257(12), 7143-7150 (1982-06-25)
We recently described a method for the purification of a protein kinase related to pp60src from Rous sarcoma virus-induced rat tumors (Blithe, D. L., Richert, N. D., and Pastan, I. H. (1982) J. Biol. Chem. 257, 7135-7142). In this report...
Assay of cyclic AMP by protein kinase activation.
S E Mayer et al.
Methods in enzymology, 38, 66-73 (1974-01-01)

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