Mixture of the sulfates of polypeptides produced by the growth of certain strains of Bacillus polymyxa, the main component being Polymyxin B1.
Assay (HPLC): sum of Polymyxins B1, B2, B3 and B1-I min. 80 %; Polymyxin B3 max. 6 %; Polymyxin B1-I max. 15 %
Peptide antibiotic that mainly acts against gram negative bacteria. Causes changes in membrane structure resulting in leakage of small molecules. Used in cell culture media against the contamination of bacteria or in other media for suppression of pathogenic germs (2,3). Inhibitor of the mitogenic response to lipopolysaccharide (4).


References:

1. Storm, D.R. et al. (1977) Ann. Rev. Biochem. 46, 723-63
2. Kwak, B. et al. (2000) Nature Medicine 6, 1399-1402
3. Alvarez-Dolado, M. et al. (2003) Nature 425, 968-73
4. Jacobs, D.M. & Morrison, D.C. (1977) J. Immunol. 118, 21-7
5. Asea, A. et al. (2000) Nature Medicine 6, 435-42

WARNING

Hazard Statements	H302
Precautions	P264
Reaction	P301 +P312 - P330
Storage	P501

HS: 38210000
Storage Temperature: +2 °C to +8 °C