IGF-1 LR3 — Certificate of Analysis

Lot IG1-2026-001 of IGF-1 LR3 assayed at 99.73% peptide purity by RP-HPLC against a ≥95.0% release specification, 4.73 percentage points clear of it. Released 07/17/2026 by ILS Laboratories, ISO/IEC 17025 Accredited. 83-residue Long R3 IGF-1 analog with an N-terminal extension and Arg3 substitution, used as a reference standard in growth-factor signaling research.

Net peptide content measured 1.05 mg against a 1 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%	99.73%	Pass
Identity (HPLC-RTM)	IGF-1 LR3 Confirmed	Confirmed	Pass
Net Peptide Content	Report Only	1.05 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	IGF-1 LR3
Also known as	Long R3 IGF-1, LR3 IGF-1, Long R3 Insulin-like Growth Factor-1
Sequence	83-aa analog (Arg3 substitution; N-terminal 13-residue extension)
Molecular formula	C400H625N111O115S9
Molecular weight	9117.6 g/mol
CAS number	946870-92-4
Physical form	Lyophilized powder
Storage	Store lyophilized powder at -20C protected from light and moisture; for extended storage -80C is recommended. Aliquot reconstituted solutions and keep frozen to minimize freeze-thaw cycles.