Selank (5MG)

Selank — a 7-residue tuftsin-analog signaling research peptide — supplied by BioFusion as a vacuum-sealed lyophilized 5mg vial for tuftsin-receptor and signaling-peptide research chemistry.

Research context

Selank is a stabilized analog of the natural tuftsin tetrapeptide (Thr-Lys-Pro-Arg) extended at the C-terminus with the tripeptide Pro-Gly-Pro to give the 7-residue heptapeptide Thr-Lys-Pro-Arg-Pro-Gly-Pro. The tripeptide tail confers metabolic stability against C-terminal proteolysis relative to native tuftsin. Frequently studied in signaling-peptide research panels alongside other small-peptide research references.

Synthesis & documentation

Produced by solid-phase peptide synthesis using Fmoc protecting-group strategy in a U.S.-based ISO 9001:2008 facility. Each lot is verified for identity (LC-MS), purity (reverse-phase HPLC-UV ≥99.0%), moisture (Karl Fischer), and counter-ion (ion chromatography). Proline-rich sequences require careful coupling-time optimization — see the Fmoc primer for synthesis decision rationale.

Storage & handling

Lyophilized Selank is stable at −20 °C for the printed shelf life. After reconstitution, the standard 14-day-at-2-8 °C reference window applies; avoid freeze-thaw cycling. The C-terminal Pro-Gly-Pro tail is robust under typical research-handling conditions. The reconstitution calculator handles working-concentration math.

Why BioFusion

Proline-rich peptides are prone to incomplete coupling during SPPS — producing low-purity batches with deletion-sequence by-products. BioFusion’s Selank is verified for ≥99.0% reverse-phase HPLC purity at every release. Batch transparency ledger publishes per-lot synthesis-date and purity. Bulk discounts at three+; members save 25% plus free U.S. shipping for 365 days.

For research and laboratory use only. This product is not a drug, food, or cosmetic, and is not intended for diagnostic, therapeutic, or in vivo human use.