Polymyxin B solution

20 mg/mL in H2O

Número de CAS:
Número MDL:

Nivel de calidad


origen biológico

Bacillus polymyxa (fermentation)



actividad óptica

[α]/D 20/D (Rotation: -2.3 +/- 0.2 degrees)


20 mg/mL in H2O


colorless to slightly yellow


H2O: soluble 20 mg/mL

Modo de acción

cell membrane | interferes

espectro de actividad antibiótica

Gram-negative bacteria
Gram-positive bacteria

temp. de almacenamiento




InChI key


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Descripción general

Polymyxin B sulfate is a strongly cationic cyclic polypeptide antibiotic that is derived from fermentation of Bacilus polymyxa. It is a mixture of B1 and B2 sulfate. The product has been used clinically to treat infections of the urinary tract, meninges and blood stream caused by susceptible strains of Pseudomonas aeruginosa.


Polymyxin B is used to study multidrug-resistant pathogens, as an immobilized agent for removal of endotoxins, and to induce pore formation in the membranes of cortex cells from excised sorghum roots.

Acciones bioquímicas o fisiológicas

Mode of Action: Polymyxin B Sulfate binds to the lipid A portion of bacterial lipopolysaccharides, disrupting the cytoplasmic membrane by inducing pores large enough to permit nucleotide leakage in bacterial walls. This disrupts the permeability of the cytoplasmic membrane.

Mode of Resistance: The activity of Polymyxin B sulfate is inhibited by iron(II), Co(II), Mn(II) and Magnesium ions. Polymyxin B may also be incompaitible with other microbial agents, including amphoterecin, cephalothin sodium, cephasolin sodium and heparin sodium.

Antimicrobial Spectrum: Has bactericidal action on most gram-negative bacilli, including E. Coli and on most fungi and gram-positive bacteria.


10ml, 125ml

Nota de preparación

This product is concentrated at 20 mg/mL in water, and should be stored at 2-8°C.

Otras notas

Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage.Handle and store under inert gas.


12 - Non Combustible Liquids

WGK Alemania


Punto de inflamabilidad F

Not applicable

Punto de inflamabilidad C

Not applicable

Equipo de protección personal

Eyeshields, Faceshields, Gloves

Certificado de Análisis

Certificado de origen

Lerner, H.R., et al.
Physiologia Plantarum, 57, 90-90 (1983)
Andrea Giacometti et al.
The Journal of antimicrobial chemotherapy, 49(1), 193-196 (2001-12-26)
The efficacy of two polymyxin-like peptides, KFFKFFKFF and IKFLKFLKFL, alone and combined with levofloxacin, was investigated in a rat model of septic shock. Rats were given an ip injection of 2 x 10(10) cfu of Escherichia coli and randomized to...
Sang-Won Lee et al.
Journal of bacteriology, 190(6), 2183-2197 (2008-01-22)
The rice pathogen recognition receptor, XA21, confers resistance to Xanthomonas oryzae pv. oryzae strains producing the type one system-secreted molecule, AvrXA21. X. oryzae pv. oryzae requires a regulatory two-component system (TCS) called RaxRH to regulate expression of eight rax (required...
Xiaodong Xiao et al.
Biochemical and biophysical research communications, 387(2), 387-392 (2009-07-21)
Isolated immunoglobulin CH2 domains were proposed as scaffolds for selection of binders with potential effector functions. We tested the feasibility of this approach by constructing a large (size 5 x 10(10)) library where all amino acids in two loops (BC...
Michael Hogardt et al.
The Journal of antimicrobial chemotherapy, 54(6), 1057-1061 (2004-10-29)
With their potent activity against Gram-negative bacteria, the polymyxins are important alternative antibiotics for cystic fibrosis (CF) patients. A retrospective evaluation of polymyxin activity against 6001 Pseudomonas aeruginosa, 150 Achromobacter xylosoxidans and 506 Stenotrophomonas maltophilia CF isolates was initiated. In...

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