Colistin sulfate: Polymyxin lipopeptide antibiotic.
Colistin sulfate testing at Vanguard Laboratory: purity, quantity and identity from $250 per vial, with results in 3 to 5 business days; sterility 14 days.
On this page: Testing · Compound data · Sequence · How we test it · Forms and references · FAQ
Every package includes purity, quantity, identity and a solubility check. Raw powder purity is $200 for a 50 mg sample.
$250
$550
$700
Each test can be added to a package or ordered on its own. Results arrive in 3 to 5 business days.
Included in every package
How pure the Colistin sulfate is and how much is in the vial: purity in area percent, quantity in mg per vial against the label. Details
Included in every package
Whether the sample contains Colistin sulfate, compared with a reference standard. Reported as match or no match. Details
Quoted
Whether the molecular mass matches Colistin sulfate, which helps catch look-alike products. Details
$70
How much TFA, acetate or chloride the powder contains. Other salt forms are quoted. Details
$150
Sterility for injectables: 1–10 unopened vials at the same sterility-test price. Bioburden for other forms. Included in Gold and Elite. Details
$200 per vial
Purity and routine identity by retention time and UV spectrum against a reference standard, without quantity: no mg per vial, concentration or label-claim result. 1 vial; 3 to 5 business days. LC-MS is quoted separately. Details
$360 per vial
Screen for semaglutide, tirzepatide and retatrutide without naming the expected peptide. Identity, amount and purity where reportable. Blind GLP-1 panel
Quoted
Which cysteines are paired, by Orbitrap high-resolution mass spectrometry of the digested peptide.
Quoted
Charge, polarity and size variants by ion-exchange, hydrophilic interaction and size-exclusion chromatography, alongside routine HPLC purity.
Quoted
Hydrolysis and amino acid analysis, to confirm composition and net peptide content.
Quoted
D- and L-forms of the amino acids, to check for racemization.
Orders of ten or more samples are 10% off.
Polymyxin lipopeptide antibiotic
C53H100N16O13 (colistin A)
1169.46 (colistin A) g/mol
1264-72-8
Identity: Colistin sulfate
Identity, purity and quantity are measured on the lab’s peptide method: reversed-phase HPLC on a C18 column with a water and acetonitrile gradient containing 0.1% TFA, UV detection at 214 to 220 nm, and LC-MS intact mass for identity, against a reference standard.
Testing to the USP Colistin monograph is available and quoted for these tests: identity by HPLC retention time against a reference standard and LC-MS intact mass, purity and assay by HPLC with UV detection, and related compounds by HPLC.
Send 1 vial for Level 1 Silver, 3 vials for Level 2 Gold or 4 vials for Level 3 Elite; raw powder purity needs a 50 mg sample. Results arrive in 3 to 5 business days; sterility takes 14 days.
No. The $250 test covers identity, purity and quantity by HPLC and LC-MS against a reference standard. Testing to the USP Colistin monograph covers the monograph tests listed on this page and is quoted.
No. Colistin is a mixture of closely related cyclic lipopeptides, mainly colistin A (polymyxin E1) and colistin B (polymyxin E2). HPLC separates the components and LC-MS confirms each by intact mass.
The $250 test reports purity and quantity by mass against a reference standard. Potency in units is defined by a microbial assay, which is not part of this test.
No. Colistimethate sodium is a different, methanesulfonated derivative of colistin with its own USP monograph. Tell us which one is on the label.
https://pubchem.ncbi.nlm.nih.gov/compound/71457944
Identity facts from the USP monograph header for this compound.
Start an order online, or send the compound name and the tests you need for a quote.
