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Research Comparison

DSIP vs SS-31

DSIP and SS-31 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:Cellular Longevity
ClassNonapeptide (9 residues), strongly acidicMitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding)
Molecular weight848.94 g/mol639.81 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasCognitive & Neurological, Cellular LongevityCellular Longevity, Metabolic
Primary diluentSterile or bacteriostatic waterBacteriostatic water (0.9% benzyl alcohol)
Working windowCommonly worked with for 2–3 weeks at 2–8 °C.Commonly worked with for 3-4 weeks at 2-8 °C.
Lead degradation routeTryptophan photo-oxidation — the characteristic route for this sequence, and the reason light protection is not optional here.Adsorptive loss to plasticware from the cationic charge — the main practical concern.
Freeze–thawAliquot on reconstitution. Freeze–thaw cycling of an acidic peptide solution also risks local pH shifts as buffer components crystallise at different rates.Tolerant; the unnatural residues resist degradation. Aliquot as standard practice.
Light sensitivityProtect from light — tryptophan is the most photo-labile proteinogenic residue and it sits at the exposed N-terminus.No specific light requirement beyond normal practice.

How they actually differ

Comparing the two: DSIP is nonapeptide (9 residues), strongly acidic, while SS-31 is mitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding) — different molecular classes with different handling consequences; they call for different primary diluents (sterile or bacteriostatic water versus bacteriostatic water (0.9% benzyl alcohol)); their leading degradation routes differ (tryptophan photo-oxidation for DSIP, adsorptive loss to plasticware from the cationic charge for SS-31), 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.

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.

SS-31 — origin

SS-31 (Elamipretide) is a Szeto-Schiller aromatic-cationic tetrapeptide (D-Arg-2',6'-dimethyltyrosine-Lys-Phe-NH2) that concentrates in the inner mitochondrial membrane and binds cardiolipin, the lipid unique to that membrane. Its structure is the reason it is studied specifically at the mitochondrion rather than as a general antioxidant.

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.

SS-31 research themes

Cardiolipin binding

Studied for selective association with cardiolipin in the inner mitochondrial membrane, the basis of its mitochondrial targeting.

Electron transport efficiency

Examined for effects on mitochondrial energy production in research models of mitochondrial dysfunction.

Oxidative stress

Investigated around reactive-oxygen-species handling at the mitochondrion.

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.

SS-31 handling

  • Reach room temperature before opening.
  • Use low-bind labware and buffers at low working concentrations to limit adsorption of the cationic peptide.
  • Aliquot and refrigerate.

Both third-party tested

Every Popular Peptides batch of DSIP and SS-31 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

DSIP reference

Full DSIP reference DSIP storage DSIP reconstitution DSIP calculatorDSIP product details

SS-31 reference

Full SS-31 reference SS-31 storage SS-31 reconstitution SS-31 calculatorSS-31 product details

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DSIP and SS-31 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.