N-Acetyl Selank Amidate

N-Acetyl Selank Amidate, also marketed under the name Adalank, is a doubly modified variant of Selank incorporating both N-terminal acetylation and C-terminal amidation. These are the two standard chemical modifications applied to extend peptide half-life: N-acetylation blocks aminopeptidase degradation from the N-terminus, while C-terminal amidation mimics the natural amide bond found in many endogenous neuropeptides (including oxytocin and vasopressin) and blocks carboxypeptidase activity.

Adalank is distinguished from N-Acetyl Selank (which carries only the N-terminal modification) by the additional C-terminal amide. It represents the most chemically stabilized version of the Selank peptide backbone commercially available. No independent published research exists for Adalank specifically. The compound is sold as a research peptide only and has no regulatory approval in any jurisdiction.

Adalank is assumed to share the full mechanistic profile of Selank with enhanced in vivo stability:

**Dual enzymatic protection:** The N-acetyl group prevents aminopeptidase N (APN) cleavage from the N-terminus, while the C-terminal amide prevents carboxypeptidase cleavage from the C-terminus. Together, these modifications address the two primary routes of plasma peptide degradation, theoretically yielding a longer active half-life than either singly-modified or unmodified Selank.

**GABAergic neurotransmission modulation** via altered expression of GABA-A receptor subunit genes and GABA synthesis enzymes — the primary anxiolytic mechanism inherited from the Selank backbone.

**Immunomodulatory activity** from the tuftsin core sequence, modulating cytokine networks and neuroimmune gene expression in the brain.

**Enkephalin metabolism:** Inhibition of enkephalin-degrading enzymes, elevating endogenous opioid tone contributing to anxiolysis and mood stabilization.

The amide modification may additionally improve BBB permeability by reducing the net negative charge of the peptide at physiological pH, though this is inferred from general peptide chemistry principles rather than direct measurement for Adalank.