• Polymyxin B1 sulfate, EvoPure packaged and labeled.

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SKU: P037

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Polymyxin B1 sulfate is one of the polypeptide fractions in polymyxin B sulfate. The fatty acid group found in polymyxin B1 sulfate is 6-methyloctanoic acid (6-MOA); the same group found in polymyxin B1-I sulfate. Polymyxin B1 however, contains a L-leucine residue, rather than the L-isoleucine reside found in polymyxin B1-I sulfate. Results from in vitro studies have shown marginal differences in MIC data when comparing the fractions.

Kassamali, et al. used polymyxin B1polymyxin B2polymyxin B3, and polymyxin B1-I to test for synergistic and antagonistic effects against various Gram-negative organisms.
Read more here: "Microbiological Assessment of Polymyxin B Components Tested Alone and In Combination"

Lim et al. used polymyxin B1, B2, B3, and B1-I from TOKU-E to study the stability of each compound in saline, dextrose, and saline/dextrose infusion solutions. "Physicochemical stability study of polymyxin B in various infusion solutions for administration to critically Ill patients." 

    CAS Number


    Molecular Formula

    C56H98N16O13 · xH2SO(lot specific)

    Molecular Weight

    1203.47 g/mol (Free base)

    Mechanism of Action

    Polymyxin B targets and alters permeability lipopolysaccharide (LPS) of gram negative bacteria leading to lysing of the cell. Polymyxin B only needs to interact with LPS, it is not required to enter the cell.

    Storage Conditions


    Tariff Code



    Polymyxin B sulfate targets the outer membrane of gram negative bacteria especially Pseudomonas aeruginosa.


    Microbiology Applications

    Polymyxin B sulfate is commonly used in clinical in vitro microbiological antimicrobial susceptibility tests (panels, discs, and MIC strips) against gram negative microbial isolates. Medical microbiologists use AST results to recommend antibiotic treatment options for infected patients. Representative MIC values include:

    • Pseudomonas aeruginosa 0.25 µg/mL – 1 µg/mL
    • For a complete list of polymyxin B sulfate MIC values, click here.

    Plant Biology Applications

    Polymyxin was successfully tested to counteract phytopathogenic gram-negative bacteria growth. Polymixin reduced bacterial growth of different strains of Pseudomonas viridiflava at low dosages (0.08 µg/ml) whereas Erwinia carotovora growth was inhibited at slightly higher concentrations (0.25 µg/ml) (Selim et al. 2005)





    White powder


    Pseudomonas sp.

Technical Data

Spectral Data - Polymyxin B1 sulfate, EvoPure®

HNMR Spectra


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Solvent: D2O
Instrument: Mercury 300
Frequency: 300 MHz


FTIR Spectra

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Mass Spectra

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    Newton, B. A. "The Properties and Mode of Action of the Polymyxins." Bacteriology Reviews (n.d.): 14-27. www.ncbi.gov. Web. 21 Aug. 2012.

    Selim S., Negrel J., Govaerts C., Gianinazzi S. and Tuinen van D., 2005, Isolation and Partial Characterization of Antagonistic Peptides Produced by Paenibacillus sp. Strain B2 Isolated from the Sorghum Mycorrhizosphere. Applied and Environmental Microbiology, Nov. 2005, p. 6501–6507

    Zavascki, Alexandre Prehn et al. "Polymyxin B for the Treatment of Multidrug-resistant Pathogens: A Critical Review." Journal of Antimicrobial Chemotherapy 60 (2007): 1206-215.Oxfordjournals. Web. 15 Jan. 2013.

    Li, Jian et al. "Development and Validation of a Reversed-phase High-performance Liquid Chromatography Assay for Polymyxin B in Human Plasma." Journal of Antimicrobial Chemotherapy (2009): n. pag. Oxfordjournals. Web. 15 Jan. 2013.

    Tam, Vincent H, et al. "In Vitro Potency of Various Polymyxin B Components." In Vitro Potency of Various Polymyxin B Components 55.9 (2011): 4490-491. Asm.org. Web. 15 Jan. 2013.

    Orwa, J. A., et al "Isolation and Structural Characterization of Polymyxin B Components." Isolation and Structural Characterization of Polymyxin B Components 912.2 (2001): 369-73. Sciencedirect. Web. 15 Jan. 2013.

    MJ Mueller, W Brodschelm. "Signaling in the elicitation process is mediated through the octadecanoid pathway leading to jasmonic acid". Proc. Natl. Acad. Sci. USA Vol. 90, pp. 7490-7494, August 1993.

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