Selamectin

Selamectin: avermectin macrocyclic lactone (veterinary antiparasitic).

Selamectin testing at Vanguard Laboratory: identity, purity and quantity $250 per sample, with results in 3 to 5 business days.

Structure

Selamectin: 2D structure drawn from the PubChem record (CID 9578507).

Compound data

CAS number

220119-17-5

Formula

C₄₃H₆₃NO₁₁

Molecular weight

769.96 g/mol

Type

Avermectin macrocyclic lactone (veterinary antiparasitic)

Structure and names

Identity: Selamectin

IUPAC name: (1R,4S,5’S,6R,6’S,8R,10E,12S,13S,14E,16E,20R,21Z,24S)-6′-cyclohexyl-24-hydroxy-21-hydroxyimino-12-[(2R,4S,5S,6S)-5-hydroxy-4-methoxy-6-methyloxan-2-yl]oxy-5′,11,13,22-tetramethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2′-oxane]-2-one

How Vanguard tests Selamectin

Method for the $250 identity, purity and quantity test: HPLC-UV purity and assay, LC-MS identity, against a reference standard, with results in 3 to 5 business days.

The USP monograph covers identity by infrared spectroscopy and HPLC retention time, assay by HPLC, organic impurities by HPLC, plus residue on ignition and water content. Full testing to the USP Selamectin monograph is available and quoted.

What's reported

Purity, as percent of total peak area
Quantity, against the label claim
Identity, reported as match or no match against the reference standard
With monograph testing (quoted): the monograph’s tests against its limits

Tests and prices

Purity and quantity

$250

Chromatographic purity and mg per unit by the method matched to the compound, identity against a reference standard. 1 unit.

Raw powder purity

$200

Chromatographic purity on bulk powder. 50 mg.

Add-on tests

Add-on test	Price
Identity and impurities
FTIR identity	$90
CHNS elemental analysis (carbon, hydrogen, nitrogen, sulfur)	$125
Chiral purity (where a chiral method exists; new methods quoted)	$250
Water, solvents and salt form
Water content by Karl Fischer	$60
Residual solvents	$150
Counterions: chloride, acetate and TFA	$70
Assay
Assay, % w/w (with raw powder purity; $250 together)	+$50
Metals and conformity
Heavy metals: arsenic, cadmium, chromium, mercury and lead	$150
Conformity: purity and quantity on more units from the same lot	$100 per extra unit
Microbiology (injectables)
Endotoxin	$210
Sterility or bioburden	$150
Container closure integrity (CCI)	$50
Screening
Fentanyl screen	$50

10% off for 10 or more samples.

Need something else? Other tests are available on request.

Sample amount and turnaround

Purity and quantity is $250 per sample (1 unit) and raw powder purity is $200 for 50 mg, with results in 3 to 5 business days. Send the material sealed and labeled, with the label claim and the form it contains.

Salts, forms and compendial references

Selamectin (CAS 220119-17-5)
Tell us the salt or form the label states, so quantity is reported on the same basis.

Questions about Selamectin testing

Is the $250 test the same as USP monograph testing?

No. The $250 test covers identity, purity and quantity by HPLC-UV for purity and assay and LC-MS for identity. Full testing to the USP Selamectin monograph is available and quoted.

What sample forms are usually tested?

Mostly topical spot-on solutions and powder. The solution is diluted in an organic solvent and assayed against a selamectin reference standard, with the result reported per milliliter or per tube.

Is selamectin sensitive to light?

Yes. Avermectins degrade with light and oxidation, and the products show up as extra HPLC peaks. Keep samples in their original tubes and away from light.

Sources

https://pubchem.ncbi.nlm.nih.gov/compound/9578507

Identity facts from the USP monograph header for this compound.

Order

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