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Polymyxin B sulfate

An antibiotic and selection agent
Catalog #: 2496
SKU-Size Size Price Qty
2496-5 5 MU
2496-25 25 MU
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Product Details

Alternate Name Aerosporin; Mastimyxin
Appearance White solid
CAS # 1405-20-5
Molecular Formula C₅₅H₉₆N₁₆O₁₃ · 2H₂SO₄
Molecular Weight 1385.61
Purity >6000 units/mg
Solubility H₂O (25 mg/ml)
InChi InChI=1S/C56H98N16O13.H2O4S/c1-7-32(4)13-11-12-16-44(75)63-36(17-23-57)51(80)72-46(34(6)74)56(85)68-39(20-26-60)48(77)67-41-22-28-62-55(84)45(33(5)73)71-52(81)40(21-27-61)65-47(76)37(18-24-58)66-53(82)42(29-31(2)3)69-54(83)43(30-35-14-9-8-10-15-35)70-49(78)38(19-25-59)64-50(41)79;1-5(2,3)4/h8-10,14-15,31-34,36-43,45-46,73-74H,7,11-13,16-30,57-61H2,1-6H3,(H,62,84)(H,63,75)(H,64,79)(H,65,76)(H,66,82)(H,67,77)(H,68,85)(H,69,83)(H,70,78)(H,71,81)(H,72,80);(H2,1,2,3,4)
PubChem CID 5702105
MDL Number MFCD00131991
Handling Protect from air and moisture
Storage Conditions 4°C
Shipping Conditions Gel Pack
USAGE For Research Use Only! Not For Use in Humans.


Polymyxin B sulfate is a polypeptide antibiotic and is composed of polymyxins B1, B2, and B3 with fractions B1 and B2 comprising the majority of the mixture. 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. Polymyxin B is routinely used as a selection agent in several types of isolation media.

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