SS31 Peptide Reconstitution Guide and Concentration Table

Standardized SS31 Peptide Reconstitution Quick Answer

To achieve a standard laboratory concentration of 10 mg/mL during ss31 peptide reconstitution, add 1.0 mL of sterile bacteriostatic water or 0.9% sodium chloride solution to a 10 mg lyophilized vial of SS-31. For higher mass vials, such as a 50 mg research vial, adding 5.0 mL of diluent achieves the identical 10 mg/mL stock density, while adding 2.5 mL yields a 20 mg/mL concentration.

When performing ss31 peptide reconstitution, gently introduce the diluent against the inner glass wall of the vial under aseptic conditions. Allow the lyophilized cake to self-dissolve without mechanical vortexing or aggressive shaking, which can cause shearing forces or denaturation. Once fully dissolved into a clear solution, aliquot the stock compound into single-use microcentrifuge tubes to limit freeze-thaw degradation during long-term storage.

Molecular Profile of SS-31 (Elamipretide) in Preclinical Research

SS-31, also designated as Elamipretide or MTP-131, is a small, cell-permeable synthetic tetrapeptide with the amino acid sequence D-Arg-Dmt-Lys-Phe-NH2 (where Dmt represents 2',6'-dimethylL-tyrosine). Structurally engineered to target the inner mitochondrial membrane (IMM), SS-31 selectively interacts with cardiolipin through hydrophobic and electrostatic interactions. Preclinical models indicate that this binding helps stabilize mitochondrial cristae architecture and optimizes electron transport chain efficiency.

Because SS-31 features alternating aromatic residue and basic amino acid motifs, it possesses a net positive charge (+3) at physiological pH. This unique cationic-aromatic structure enables rapid cellular and mitochondrial uptake without relying on receptor-mediated transport mechanisms. Researchers studying cellular bioenergetics often utilize high-purity research peptides like SS-31 to evaluate ROS scavenging, ATP output, and mitochondrial permeability transition pore (mPTP) kinetics in vitro.

Volumetric Reconstitution Calculations and Laboratory Protocols

Accurate ss31 peptide reconstitution depends on the fundamental concentration formula: $C = m / V$, where $C$ represents concentration in mg/mL or $\mu g/\mu L$, $m$ is the total mass of the lyophilized peptide in milligrams, and $V$ is the total diluent volume in milliliters. Converting target assay working concentrations (e.g., micromolar or nanomolar ranges) from stock solutions requires executing precise serial dilutions.

To calculate working stock dilutions for enzymatic or cell culture assays, use the standard equation $C_1V_1 = C_2V_2$. For instance, to prepare 10 mL of a $100\ \mu M$ SS-31 working solution (molecular weight $\approx 639.8\ g/mol$) from a 10 mg/mL stock solution ($15.63\ mM$), pipette $63.98\ \mu L$ of stock into $9.936\ mL$ of sterile buffer. Using our internal reconstitution calculator simplifies these volumetric conversions prior to performing delicate bioenergetic experiments.

SS-31 Reconstitution Volumetric Reference Chart

The following reference matrix details exact concentration outcomes across standard lyophilized vial masses and diluent volumes commonly utilized in analytical testing:

• 10 mg SS-31 Vial + 1.0 mL Diluent = 10.0 mg/mL (10.0 $\mu g/\mu L$ | ~15.63 mM) • 10 mg SS-31 Vial + 2.0 mL Diluent = 5.0 mg/mL (5.0 $\mu g/\mu L$ | ~7.81 mM) • 10 mg SS-31 Vial + 5.0 mL Diluent = 2.0 mg/mL (2.0 $\mu g/\mu L$ | ~3.13 mM) • 50 mg SS-31 Vial + 2.5 mL Diluent = 20.0 mg/mL (20.0 $\mu g/\mu L$ | ~31.26 mM) • 50 mg SS-31 Vial + 5.0 mL Diluent = 10.0 mg/mL (10.0 $\mu g/\mu L$ | ~15.63 mM) • 50 mg SS-31 Vial + 10.0 mL Diluent = 5.0 mg/mL (5.0 $\mu g/\mu L$ | ~7.81 mM)

When designing high-throughput screening assays, maintaining consistent stock concentrations minimizes pipette transfer error across experimental replicates. Researchers needing larger quantities for longitudinal rodent models can source bulk quantities through our wholesale laboratory channel.

Solubility Characteristics and Solvent Selection

Lyophilized SS-31 demonstrates high solubility in aqueous diluents due to its polar residues and low molecular weight. Standard reconstitutions utilize Bacteriostatic Water (0.9% benzyl alcohol) for multi-use analytical workflows or sterile Phosphate-Buffered Saline (PBS, pH 7.4) and 0.9% Sodium Chloride for cell-free enzyme assays where preserve stability is required without antimicrobial additives.

Although SS-31 is highly soluble in aqueous media, organic solvents such as DMSO (Dimethyl sulfoxide) may be utilized to create ultra-concentrated master stocks (up to 50 mg/mL) for specialized ex vivo tissue baths. However, investigators must verify that residual DMSO levels in final assay wells do not exceed 0.1% v/v to prevent membrane artifacts. Consult our peptide storage guide for specific solvent-compatibility guidelines.

Storage Conditions, Temperature Stability, and Aliquoting

Proper temperature control is critical to prevent hydrolytic degradation or oxidation of the tyrosine-like Dmt residue. Unreconstituted lyophilized SS-31 powder should be stored desiccated at -20°C for short-term evaluation or -80°C for extended stability up to 24 months. Vials should be allowed to equilibrate to room temperature before reconstitution to prevent condensation inside the glass container.

Following ss31 peptide reconstitution, aqueous solutions remain stable at 2°C to 8°C for up to 14 days when preserved with bacteriostatic benzyl alcohol. For long-term utility, immediately divide the reconstituted stock into single-use polypropylene aliquots and store at -80°C. Repeated freeze-thaw cycles must be avoided, as ice crystal formation can promote peptide aggregation and lower functional assay potency.

Comparative Analysis: Bioenergetic and Mitochondrial Research Peptides

When evaluating cellular bioenergetics, metabolic signaling, and cytoprotective pathways, researchers frequently compare SS-31 against other targeted mitochondrial peptides. While SS-31 functions primarily via physical membrane cardiolipin interaction, mitochondrial-derived peptides like MOTS-c operate as metabolic regulators that translocate to the nucleus during metabolic stress to alter gene expression.

Similarly, Humanin exerts cytoprotective effects by interacting with cell-surface receptors and modulating apoptotic cascades, contrasting with SS-31's direct physical interaction with the electron transport chain complex. Other cytoprotective compounds like BPC-157 target angiogenesis and tissue repair pathways rather than inner mitochondrial membrane bioenergetics. Understanding these distinct structural and functional differences allows researchers to select the precise peptide model for their experimental frameworks.

Quality Verification: HPLC, Mass Spectrometry, and Endotoxin Standards

Experimental reliability requires rigorous verification of peptide purity and freedom from bacterial endotoxins. Low-purity peptide preparations introduce variable contaminants that disrupt subtle cell culture readouts, mitochondrial respiration assays, and oxygen consumption rate (OCR) measurements using extracellular flux analyzers.

PX1 Research subjects every manufacturing batch of SS-31 to analytical Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) to guarantee purity exceeding 98.0%. Electrospray Ionization Mass Spectrometry (ESI-MS) confirms exact molecular mass (639.8 g/mol), while USP <85> Chromogenic LAL testing verifies endotoxin levels remain strictly under <0.01 EU/mg. Every shipment includes a lot-specific, ISO 17025 accredited Certificate of Analysis (COA) for total empirical transparency. Explore our complete testing methodology in the PX1 research library.

Preclinical Applications in Mitochondrial Bioenergetics

In vitro data indicate that SS-31 insertion into cardiolipin-rich liposomes restores membrane curvature, reduces electron leakage from Complex I and Complex III, and inhibits excessive superoxide ($O_2^{\bullet-}$) production. In isolated mitochondrial assays, application of SS-31 maintains state 3 respiration rates under conditions of oxidative stress.

Preclinical rodent models evaluating ischemia-reperfusion injury and neurodegenerative pathology demonstrate that SS-31 administration reduces cytochrome c release and suppresses downstream caspase activation. Furthermore, ex vivo cardiac trabeculae studies show improved ATP production efficiency per unit of oxygen consumed ($P/O$ ratio) when treated with SS-31 prior to hypoxia protocols. All PX1 products are provided strictly as research peptides for non-clinical laboratory analysis.

PX1 Research Supply Integrity and Institutional Procurement

PX1 Research serves academic institutions, contract research organizations (CROs), and biotechnology firms with high-specification research compounds manufactured in US-based, cGMP-compliant facilities. Maintaining rigorous quality control eliminates batch-to-batch variation, ensuring reproducible quantitative results across multi-phase experimental designs.

Orders placed before 3:00 PM EST ship same-day M–F from our primary distribution hubs in California and Arizona. Each vial is vacuum-sealed with tamper-evident security packaging to guarantee compound integrity during transit. Institutional buyers requiring bulk lot reservation or custom vial filling can utilize our streamlined wholesale services.