SS-31 Reconstitution Chart (Every Vial Size)

Overview of SS-31 (Elamipretide) Reconstitution Dynamics

SS-31 (also known as Elamipretide or D-Arg-2',6'-Dmt-Lys-Phe-NH2) is a small, tetrapeptide compound studied extensively in preclinical models for its ability to selectively target and bind to cardiolipin within the inner mitochondrial membrane. When received as a lyophilized powder, the peptide is highly stable in its cake form if maintained under recommended temperature conditions. However, once reconstituted into a liquid phase, the compound's stability, concentration accuracy, and biological activity become dependent on precise laboratory reconstitution protocols.

Researchers evaluating a high-purity SS-31 vial must calculate exact diluent-to-peptide ratios to ensure reproducible working concentrations in assay media. Reconstitution converts the dry peptide mass into a homogenous solution suitable for serial dilutions, automated microplate dispensing, or cell culture treatment. Because variations in liquid volume directly alter the effective concentration per aliquot, utilizing a standardized volumetric chart eliminates rounding errors and protocol inconsistencies across different laboratory operators.

Before beginning any volumetric addition, primary investigators should inspect the physical integrity of the vial, confirm the exact mass stated on the manufacturer lot label, and verify batch-specific purity levels by reviewing the accompanying certificate of analysis (COA). Maintaining strict volumetric accuracy ensures that preclinical data derived from cellular respiration studies, reactive oxygen species (ROS) inhibition assays, or isolated organelle experiments remain robust and replicable.

Master SS-31 Reconstitution Chart (10 mg, 20 mg, and 50 mg Vials)

The following master reference table provides calculated final concentrations (mg/mL) and corresponding peptide mass contained within a standard 0.1 mL (100 µL) aliquot across common laboratory vial sizes (10 mg, 20 mg, and 50 mg) and diluent volumes (1.0 mL to 10.0 mL).

| Vial Mass (mg) | Diluent Volume Added (mL) | Resulting Concentration (mg/mL) | SS-31 Content per 0.1 mL (100 µL) | SS-31 Content per 0.01 mL (10 µL) | |---|---|---|---|---| | 10 mg | 1.0 mL | 10.0 mg/mL | 1.0 mg (1000 µg) | 0.10 mg (100 µg) | | 10 mg | 2.0 mL | 5.0 mg/mL | 0.5 mg (500 µg) | 0.05 mg (50 µg) | | 10 mg | 2.5 mL | 4.0 mg/mL | 0.4 mg (400 µg) | 0.04 mg (40 µg) | | 10 mg | 3.0 mL | 3.33 mg/mL | 0.33 mg (333 µg) | 0.033 mg (33.3 µg) | | 10 mg | 5.0 mL | 2.0 mg/mL | 0.2 mg (200 µg) | 0.02 mg (20 µg) | | 20 mg | 1.0 mL | 20.0 mg/mL | 2.0 mg (2000 µg) | 0.20 mg (200 µg) | | 20 mg | 2.0 mL | 10.0 mg/mL | 1.0 mg (1000 µg) | 0.10 mg (100 µg) | | 20 mg | 4.0 mL | 5.0 mg/mL | 0.5 mg (500 µg) | 0.05 mg (50 µg) | | 20 mg | 5.0 mL | 4.0 mg/mL | 0.4 mg (400 µg) | 0.04 mg (40 µg) | | 20 mg | 10.0 mL | 2.0 mg/mL | 0.2 mg (200 µg) | 0.02 mg (20 µg) | | 50 mg | 2.0 mL | 25.0 mg/mL | 2.5 mg (2500 µg) | 0.25 mg (250 µg) | | 50 mg | 5.0 mL | 10.0 mg/mL | 1.0 mg (1000 µg) | 0.10 mg (100 µg) | | 50 mg | 10.0 mL | 5.0 mg/mL | 0.5 mg (500 µg) | 0.05 mg (50 µg) | | 50 mg | 25.0 mL | 2.0 mg/mL | 0.2 mg (200 µg) | 0.02 mg (20 µg) |

For custom vial masses or non-standard reconstitutions outside the parameters shown in this chart, researchers can utilize our interactive peptide reconstitution calculator to instantly compute custom stock solution concentrations and aliquot requirements.

Mathematical Formulas and Calculations for Reconstitution

Determining the concentration of a reconstituted peptide stock solution requires basic volumetric equations based on mass and liquid volume. The primary concentration formula is defined as:

Concentration (C) = Mass of Peptide (M) / Total Volume of Diluent (V)

Where Mass (M) is expressed in milligrams (mg), Volume (V) is expressed in milliliters (mL), and Concentration (C) is expressed in milligrams per milliliter (mg/mL). To determine the mass of active compound present in a given working volume (aliquot volume, V_aliquot), use the target yield formula: Aliquot Mass = Concentration (C) × Aliquot Volume (V_aliquot).

Converting milligrams to micrograms is accomplished by multiplying the milligram value by 1,000 (1 mg = 1,000 µg). Conversely, converting microliters (µL) to milliliters (mL) involves dividing by 1,000 (100 µL = 0.1 mL). Applying these standardized formulas prevents stock concentration variance across serial microplate assays.

Step-by-Step Worked Reconstitution Examples

To illustrate the practical application of these formulas in a laboratory setting, consider two common research reconstitution scenarios using PX1 Research compounds.

Worked Example 1: Preparing a 5.0 mg/mL Stock Solution from a 10 mg SS-31 Vial A research team requires a stock concentration of exactly 5.0 mg/mL for an in vitro oxidative stress assay using isolated mitochondria. The protocol specifies a 10 mg vial of SS-31. To find the required diluent volume (V): V = Mass / Concentration = 10 mg / 5.0 mg/mL = 2.0 mL. The technician aspirates 2.0 mL of sterile bacteriostatic water or sterile saline and introduces it slowly along the inner glass wall of the vial. Once fully dissolved, each 100 µL (0.1 mL) draw delivers exactly 0.5 mg (500 µg) of SS-31.

Worked Example 2: Preparing a 10.0 mg/mL High-Concentration Stock from a 50 mg SS-31 Vial For high-throughput screening or bulk stock preparation, a laboratory uses a 50 mg SS-31 vial and requires a 10.0 mg/mL concentration. Applying the formula: V = 50 mg / 10.0 mg/mL = 5.0 mL of diluent. Adding 5.0 mL of solvent yields a 10.0 mg/mL stock solution. In this configuration, a 10 µL micro-pipette stroke delivers 100 µg of SS-31, providing precise dosing for low-volume cell culture wells.

Selecting Diluents for SS-31 In Vitro Protocols

Choosing the appropriate solvent or diluent depends entirely on the design, duration, and biological requirements of the planned experiment. SS-31 is highly water-soluble due to its hydrophilic amino acid composition, dissolving readily in aqueous media.

1. Bacteriostatic Water (0.9% Benzyl Alcohol): Recommended when the reconstituted vial will be accessed repeatedly over multiple days or weeks. The addition of 0.9% benzyl alcohol acts as a bacteriostatic agent, preventing bacterial proliferation during repeated septum punctures under cold storage (2°C to 8°C).

2. Sterile Water for Injection (Sterile WFI / Deionized Water): Ideal for immediate single-use applications or sensitive cell culture assays where trace benzyl alcohol might interfere with cellular viability or mitochondrial membrane potential measurements.

3. Sterile Isotonic Saline (0.9% NaCl): Frequently selected for preclinical tissue bath preparations or organ perfusion models requiring physiologic osmolality. SS-31 maintains complete solubility in sterile 0.9% sodium chloride solutions.

Researchers exploring our full catalog of research peptides should verify solvent compatibility for each specific peptide, as non-polar or hydrophobic compounds may require initial solubilization in DMSO or dilute acetic acid, whereas SS-31 dissolves readily in standard aqueous diluents.

Aseptic Laboratory Handling & Volumetric Pipetting Standards

To preserve peptide integrity, maintain sterility, and prevent mass loss during reconstitution, laboratory personnel should adhere to strict aseptic techniques within a certified laminar flow hood or biosafety cabinet.

Prior to reconstitution, allow the sealed lyophilized vial to equilibrate to room temperature (20°C to 25°C) for 20–30 minutes. Reconstituting cold glass directly can cause condensation to form inside the vial upon opening, introducing moisture that accelerates enzymatic or hydrolytic degradation. Sanitize the rubber septum with a 70% isopropyl alcohol wipe and allow it to air-dry completely.

When introducing the solvent, insert the needle or pipette tip at a slight angle and discharge the liquid slowly down the internal glass wall. Avoid direct high-pressure spraying onto the lyophilized cake to prevent foaming or protein shear. Gently swirl the vial in a smooth circular motion until the powder dissolves completely into a clear, colorless solution. Never vortex peptide solutions vigorously, as mechanical agitation can induce aggregation or structural denaturation.

Comparative Analysis: SS-31 and Related Mitochondrial Research Peptides

When designing mitochondrial targeted assays, investigators frequently evaluate SS-31 alongside other peptides targeting organellar energetic pathways. The mitochondrial-targeted peptide class includes compounds such as MOTS-c (a mitochondrial open reading frame of the 12S rRNA-derived peptide) and Humanin.

While MOTS-c regulates nuclear gene expression involved in metabolic homeostasis and insulin sensitivity in rodent cell models, SS-31 selectively binds to cardiolipin in the inner mitochondrial membrane to stabilize cristae architecture and reduce electron leak. Humanin demonstrates cytoprotective properties against oxidative stressors in vitro. Comparing these distinct mechanisms allows researchers to select the optimal peptide or combination for specific cellular assay models available through our catalog of research peptides.

For additional guidance on reconstituting mitochondrial research compounds, consult our specialized MOTS-c reconstitution reference to compare reconstitution volumes, solubility limits, and molar calculations across different peptide structures.

Storage, Stability, and Temperature Control for Reconstituted SS-31

Lyophilized SS-31 powder exhibits excellent long-term stability when stored unopened at -20°C or -80°C, protected from light and desiccant-sealed. Under these conditions, the un-reconstituted peptide retains purity and sequence integrity for up to 24 months.

Once reconstituted in aqueous solution, degradation pathways such as hydrolysis and oxidation accelerate over time. Liquid stock solutions stored at 2°C to 8°C (refrigerated) should generally be used within 7 to 14 days when prepared with bacteriostatic diluents, or within 24 hours if prepared with preservative-free sterile water.

For extended storage of reconstituted SS-31 stock, divide the liquid into single-use micro-aliquots in polypropylene tubes and store immediately at -80°C. Avoid repeated freeze-thaw cycles, as ice crystal formation degrades peptide secondary structures and reduces effective concentration. When thawing aliquots for experimental runs, allow them to warm gently on ice prior to adding to assay buffers.

Quality Verification: Analytical COAs, HPLC/MS, and Endotoxin Standards at PX1 Research

Rigorous research outcomes depend upon verified chemical purity and strict quality control standards. PX1 Research supplies high-purity research peptides manufactured in GMP-compliant, USA-based facilities adhering to rigorous quality management systems.

Every production lot of SS-31 undergoes independent testing in an ISO 17025 accredited laboratory. Purity is confirmed via High-Performance Liquid Chromatography (HPLC) to guarantee ≥98% chemical purity, while Mass Spectrometry (MS) verifies correct molecular weight and amino acid sequence identity. Furthermore, compounds undergo bacterial endotoxin testing (<0.05 EU/mg) to ensure compatibility with sensitive primary cell cultures and in vitro organelle assays.

Researchers can inspect and download lot-specific documentation directly via our certificate of analysis (COA) repository. To explore institutional purchasing, bulk quantities, or dedicated academic laboratory supply, visit the PX1 wholesale program or browse our central PX1 peptide research hub.