Selank — Certificate of Analysis

Lot SK10-2026-001 of Selank assayed at 99.65% peptide purity by RP-HPLC against a ≥95.0% release specification, 4.65 percentage points clear of it. Released 06/29/2026 by ILS Laboratories, ISO/IEC 17025 Accredited. Synthetic heptapeptide analog of tuftsin (TKPRPGP), used as a reference compound in neuro-immune and receptor signaling models. Laboratory research use only.

Net peptide content measured 10.59 mg against a 10 mg label — the mass of actual peptide in the vial, as distinct from salts, water and counter-ions. It is reported rather than graded, so it carries no pass/fail.

Full QC panel

Analyte	Specification	Result	Status
Peptide Purity (HPLC)	≥ 95.0%	99.65%	Pass
Identity (HPLC-RTM)	Selank Confirmed	Confirmed	Pass
Net Peptide Content	Report Only	10.59 mg	—
Fentanyl Screen	Immunoassay, 50 ng/mL cutoff	Not Detected	Pass

Sterility & endotoxin

Test	Specification	Result	Status
Sterility (PCR)	No Growth	No Growth	Pass
Endotoxin (USP <85>)	Report Result	NMT 0.05 EU/mL	Reported

Endotoxin is reported as a measured value rather than graded pass/fail: acceptable limits depend on route and matrix, and no universal threshold applies to research-use material. The laboratory reports the figure and leaves the judgement to you.

Elemental impurities

Panel	Method	Result	Status
Arsenic, cadmium, chromium, lead, mercury	ICP-MS, USP <233>	5 of 5 under limit	Pass

Per-element measurements are on the signed certificate below and in the laboratory's own record.

Reference data

Property	Value
Compound	Selank
Also known as	TKPRPGP, Thr-Lys-Pro-Arg-Pro-Gly-Pro, Tuftsin analog heptapeptide
Sequence	Thr-Lys-Pro-Arg-Pro-Gly-Pro
Molecular formula	C33H57N11O9
Molecular weight	751.9 g/mol
CAS number	129954-34-3
Physical form	Lyophilized powder
Storage	Store lyophilized powder at -20C protected from light and moisture for long-term stability. After reconstitution, store at 2-8C and use within a short period; avoid repeated freeze-thaw cycles.