Quantitative purity testing is not performed on this product. The minimum activity is 11,500 units per milligram. The maximum allowable related substances is 5.5%. These values vary from lot to lot and are reported in the product Certificate of Analysis. The amount of powder in each vial may be determined by dividing the number of units in a given package size by the lot specific activity results. For example, 10000000 units / 11500 IU per milligram = 869.6 mg per vial. Please see the link below to review a sample or lot specific Certificate:
https://www.sigmaaldrich.com/product/sigma/c1511#product-documentation
C1511
Colistin sodium methanesulfonate
~11,500 U/mg
Synonym(s):
Colimycin sodium methanesulfonate, Methanesulfonic acid derivative of Polymyxin E, Polymyxin E sodium methanesulfonate
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| Size/SKU | Availability | Price |
|---|---|---|
10000000 units | Available to ship TODAYfromMILWAUKEE | $261.00 $195.75 |
100000000 units | Available to ship TODAYfromMILWAUKEE | $1,610.00 |
About This Item
Empirical Formula (Hill Notation):
C58H115N16Na5O28S5
CAS Number:
Molecular Weight:
1759.90
NACRES:
NA.85
PubChem Substance ID:
UNSPSC Code:
51102829
EC Number:
232-516-9
MDL number:
$195.75
List Price$261.00Save 25%Web-Only Promotion
Available to ship TODAYDetails
form
powder
Quality Segment
specific activity
~11,500 U/mg
solubility
H2O: 50 mg/mL
antibiotic activity spectrum
Gram-negative bacteria
mode of action
cell membrane | interferes
storage temp.
2-8°C
SMILES string
[Na+].[Na+].[Na+].[Na+].[Na+].CS([O-])(=O)=O.CS([O-])(=O)=O.CS([O-])(=O)=O.CS([O-])(=O)=O.CS([O-])(=O)=O.CCC(C)CCCCC(=O)N[C@@H](CCN)C(=O)N[C@@H](C(C)O)C(=O)N[C@@H](CCN)C(=O)N[C@H]1CCNC(=O)[C@@H](NC(=O)[C@H](CCN)NC(=O)[C@@H](CCN)NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](CC(C)C)NC(=O)[C@H](CCN)NC1=O)C(C)O
InChI
1S/C53H100N16O13.5CH4O3S.5Na/c1-9-30(6)12-10-11-13-41(72)60-33(14-20-54)48(77)69-43(32(8)71)53(82)65-36(17-23-57)45(74)64-38-19-25-59-52(81)42(31(7)70)68-49(78)37(18-24-58)62-44(73)34(15-21-55)63-50(79)39(26-28(2)3)67-51(80)40(27-29(4)5)66-46(75)35(16-22-56)61-47(38)76;5*1-5(2,3)4;;;;;/h28-40,42-43,70-71H,9-27,54-58H2,1-8H3,(H,59,81)(H,60,72)(H,61,76)(H,62,73)(H,63,79)(H,64,74)(H,65,82)(H,66,75)(H,67,80)(H,68,78)(H,69,77);5*1H3,(H,2,3,4);;;;;/q;;;;;;5*+1/p-5/t30?,31-,32-,33+,34-,35+,36+,37+,38+,39+,40-,42+,43+;;;;;;;;;;/m1........../s1
InChI key
WSDSONZFNWDYGZ-BKFDUBCBSA-I
General description
Chemical structure: peptide
Application
Colistin sodium methanesulfate is used to permeabilize bacterial cell membranes and to study mannose-resistant haemagglutination.
Biochem/physiol Actions
Colistin is a cationic, multicomponent lipopeptide antibiotic. It consists of a cyclic heptapeptide with tripeptide side chain, acylated at the N terminus by a fatty acid. It exhibits a potent anti-endotoxin. Colistin interacts with the anionic LPS molecules and displaces calcium and magnesium ions. It solubilzes the cytoplasmic membrane resulting in leakage of cytosol which contributes to the bactericidal effect.
Mode of Action: Binds to lipids on the cell cytoplasmic membrane of Gram-negative bacteria and disrupts the cell wall integrity.
Antimicrobial spectrum: Gram-negative bacteria.
Antimicrobial spectrum: Gram-negative bacteria.
Other Notes
Keep container tightly closed in a dry and well-ventilated place.Keep in a dry place.
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This Item | |||
|---|---|---|---|
| description ~11,500 U/mg | description from Bacillus colistinus | description United States Pharmacopeia (USP) Reference Standard | description Pharmaceutical Secondary Standard; Certified Reference Material |
| mode of action cell membrane | interferes | mode of action cell membrane | interferes | mode of action - | mode of action - |
| antibiotic activity spectrum Gram-negative bacteria | antibiotic activity spectrum Gram-negative bacteria | antibiotic activity spectrum - | antibiotic activity spectrum - |
| Quality Level 200 | Quality Level 200 | Quality Level - | Quality Level 300 |
| form powder | form powder or crystals | form solid | form - |
| solubility H2O: 50 mg/mL | solubility - | solubility - | solubility - |
| storage temp. 2-8°C | storage temp. 2-8°C | storage temp. −20°C | storage temp. -10 to -25°C |
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Storage Class
11 - Combustible Solids
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, type N95 (US)
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How I can convert U/mg (specific activity of this product) to mg/mg? Thanks
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