Purity

99.0%

Vial

3 mL × 10

Lot

GPB-4544

Neuro · CAS 129954-34-3

Selank

Tuftsin Analogue Heptapeptide

The pre-filled pen range Ask GpharmaBio for a vial quote

UK & Europe Next-Day Delivery — Order before 1pm.Worldwide Delivery — Estimated delivery within 5–10 days.

The certificate for lot GPB-4544 is published in full further down this page.

Supplied in sealed boxes of 10 vials, one lot to a box. Single vials are not broken out of a box.

Primary sequence

ThrLysProArgProGlyPro

Physical data

Molecular formula: C₃₃H₅₇N₁₁O₉
Molecular weight: 751.89 g/mol
CAS number: 129954-34-3
Appearance: White lyophilised cake
Solubility: Soluble in water; slightly hygroscopic
Storage: Lyophilised: −20 °C, desiccated

Certificate of analysis

Lot GPB-4544, in full.

Published here. Nothing to request, nothing behind a form.

GpharmaBio

RESEARCH PEPTIDE LAB

part of GBAGROUP

CERTIFICATE OF ANALYSIS

GPB-4544

PRODUCT: Selank
FILL: 10 mg / 3 mL vial · box of 10
SYNTHESISED: 9 Jul 2026
RELEASED: 17 Jul 2026
RETEST: Jul 2028

IDENTITY

CAS NUMBER: 129954-34-3
MOLECULAR FORMULA: C₃₃H₅₇N₁₁O₉
MOLECULAR WEIGHT: 751.89 g/mol

RP-HPLC, C18 2.7 µm 150 × 4.6 mm · 0.1% TFA / MeCN, 5–65% over 30 min · 1.0 mL/min · DAD 214 nm

Analytical purity scaleRP-HPLC area @ 214 nm

99.0%

Measured, this lot

High purity

Release specification ≥ 98.0%

99.0%

9596979899100

Red rule marks the house release limit. This lot sits 1.0 points above it. Area percent cannot see anything without a chromophore at 214 nm, which is why moisture, counterion and net peptide content are reported separately below.

TEST	RESULT, THIS LOT
RP-HPLC purity (55 °C)	99.0% area @ 214 nm
RP-HPLC purity (ambient)	97.4% area — rotamer broadened
Identity (ESI-MS)	752.5 [M+H]⁺
Net peptide content	81.6%
Water (Karl Fischer)	3.7%
Bacterial endotoxin	< 0.15 EU/mg (LAL)

Security code

N7BS-DYJF

Verified by AUTHENTIX®

This is the sheet for the lot on the shelf — not a representative document. If the lot number moves on before you order, the page moves with it.

Handling

Expect peak broadening on ambient-temperature columns.
Hygroscopic — weigh quickly, recap under dry gas if possible.
Stable ~21 days at 2–8 °C in solution.

For laboratory research use only. Not for human or veterinary consumption, diagnostic or therapeutic use.

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