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Research Comparison

ARA 290 vs DSIP

ARA 290 and DSIP are studied in overlapping research areas, which is why they are frequently compared. This is a neutral side-by-side reference drawn from published preclinical literature and laboratory handling data.

Shared research areas:Cognitive & Neurological
Class11-amino-acid EPO-derived linear peptideNonapeptide (9 residues), strongly acidic
Molecular weight1257.4 g/mol848.94 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasTissue Regeneration, Cognitive & NeurologicalCognitive & Neurological, Cellular Longevity
Primary diluentBacteriostatic water (0.9% benzyl alcohol)Sterile or bacteriostatic water
Working windowCommonly worked with for 2-4 weeks at 2-8 °C in bacteriostatic water.Commonly worked with for 2–3 weeks at 2–8 °C.
Lead degradation routeAsparagine/glutamine deamidation is the most plausible slow route for this sequence.Tryptophan photo-oxidation — the characteristic route for this sequence, and the reason light protection is not optional here.
Freeze–thawAliquot on first reconstitution; the short backbone tolerates a freeze better than folded proteins but repeated cycles still concentrate solutes at the ice interface.Aliquot on reconstitution. Freeze–thaw cycling of an acidic peptide solution also risks local pH shifts as buffer components crystallise at different rates.
Light sensitivityNo specific light requirement beyond normal practice.Protect from light — tryptophan is the most photo-labile proteinogenic residue and it sits at the exposed N-terminus.

How they actually differ

Comparing the two: ARA 290 is 11-amino-acid epo-derived linear peptide, while DSIP is nonapeptide (9 residues), strongly acidic — different molecular classes with different handling consequences; they call for different primary diluents (bacteriostatic water (0.9% benzyl alcohol) versus sterile or bacteriostatic water); their leading degradation routes differ (asparagine/glutamine deamidation is the most plausible slow route for this sequence. for ARA 290, tryptophan photo-oxidation for DSIP), so the storage precautions that matter are not the same; their practical working windows differ once reconstituted. The sections below set out each in full.

ARA 290 — origin

ARA 290 (Cibinetide) is an 11-residue peptide modelled on the helix-B surface of erythropoietin. It was engineered to engage the innate repair receptor — a heteromer of the EPO receptor and the beta-common receptor — without the erythropoietic (red-blood-cell-stimulating) activity of full-length EPO.

DSIP — origin

DSIP was isolated in the 1970s from the cerebral venous blood of rabbits in slow-wave sleep, in one of the more unusual isolation efforts in neuropeptide research. The name records the assay it was found by rather than a settled mechanism — its physiological role remains debated in the literature.

ARA 290 research themes

Innate repair receptor

Studied for selective engagement of the EPOR/beta-common receptor heteromer that mediates tissue-protective signalling, distinct from the classical erythropoietic receptor.

Neuropathic pain models

A substantial share of the published literature examines small-fibre and neuropathic-pain research models.

Anti-inflammatory signalling

Investigated for modulation of inflammatory pathways in preclinical tissue-injury models.

DSIP research themes

Sleep architecture

Investigated for effects on slow-wave sleep in the models that gave the peptide its name.

Cortisol and HPA regulation

Studies have examined interactions with stress-axis signalling.

Neuroprotection

Explored in preclinical models of oxidative and stress-related neuronal injury.

Contested mechanism

Notably, decades of work have not converged on an accepted receptor or mechanism — a recurring theme in the literature.

ARA 290 handling

  • Reach room temperature before opening the vial.
  • Add diluent gently down the vial wall; do not vortex.
  • Use low-bind labware at low working concentrations to limit adsorption.

DSIP handling

  • Store and handle protected from light at all stages, including during reconstitution.
  • Keep working solutions at or above neutral pH; acidification risks precipitation near the isoelectric point.
  • Avoid prolonged storage of reconstituted material — the isomerisation route is slow but cumulative.

Both third-party tested

Every Popular Peptides batch of ARA 290 and DSIP is independently tested by HPLC and LC-MS with a published Certificate of Analysis. Enter a lot number to pull the COA for a specific vial.

Verify a batchPublished COAsHow we test

ARA 290 reference

Full ARA 290 reference ARA 290 storage ARA 290 reconstitution ARA 290 calculatorARA 290 product details

DSIP reference

Full DSIP reference DSIP storage DSIP reconstitution DSIP calculatorDSIP product details

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ARA 290 and DSIP are supplied strictly as research chemicals for in-vitro laboratory and research use only. They are not intended for human or animal consumption, diagnostic, or therapeutic use. This comparison summarizes published preclinical literature and laboratory handling data; it is not medical advice, not a claim of efficacy, and not usage guidance.