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Research Comparison

SS-31 vs Thymosin Alpha-1

SS-31 and Thymosin Alpha-1 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
ClassMitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding)N-acetylated 28-residue thymic peptide
Molecular weight639.81 g/mol3108.3 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasCellular Longevity, MetabolicImmune, Cellular Longevity
Primary diluentBacteriostatic water (0.9% benzyl alcohol)Bacteriostatic water (0.9% benzyl alcohol)
Working windowCommonly worked with for 3-4 weeks at 2-8 °C.Commonly worked with for 2-4 weeks at 2-8 °C.
Lead degradation routeAdsorptive loss to plasticware from the cationic charge — the main practical concern.Deamidation and aspartate isomerisation in this Asn/Asp-rich sequence — the most plausible slow route.
Freeze–thawTolerant; the unnatural residues resist degradation. Aliquot as standard practice.Aliquot on first reconstitution; the disordered chain tolerates a freeze but repeated cycles concentrate solutes at the ice interface.
Light sensitivityNo specific light requirement beyond normal practice.No specific light requirement beyond normal practice.

How they actually differ

Comparing the two: SS-31 is mitochondria-targeting aromatic-cationic tetrapeptide (cardiolipin-binding), while Thymosin Alpha-1 is n-acetylated 28-residue thymic peptide — different molecular classes with different handling consequences; their leading degradation routes differ (adsorptive loss to plasticware from the cationic charge for SS-31, deamidation and aspartate isomerisation in this asn/asp-rich sequence for Thymosin Alpha-1), 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.

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.

Thymosin Alpha-1 — origin

Thymosin Alpha-1 is an N-terminally acetylated 28-amino-acid peptide derived from prothymosin alpha and originally isolated from thymic tissue. It is one of the most-studied immune-modulating peptides, examined for a role in T-cell maturation and immune signalling; the clinical formulation is known as Zadaxin.

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.

Thymosin Alpha-1 research themes

T-cell maturation

Studied for a role in the maturation and function of T-cells in immune research models.

Immune signalling

Examined around innate immune signalling pathways, including Toll-like-receptor involvement, in preclinical work.

Infection and adjuvant research

Investigated in models of immune response to infection and as a research adjuvant.

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.

Thymosin Alpha-1 handling

  • Reach room temperature before opening.
  • Swirl to dissolve; the disordered peptide clears quickly.
  • Label aliquots with reconstitution date and diluent.

Both third-party tested

Every Popular Peptides batch of SS-31 and Thymosin Alpha-1 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

SS-31 reference

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

Thymosin Alpha-1 reference

Full Thymosin Alpha-1 reference Thymosin Alpha-1 storage Thymosin Alpha-1 reconstitution Thymosin Alpha-1 calculatorThymosin Alpha-1 product details

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SS-31 and Thymosin Alpha-1 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.