Proper SS 31 reconstitution requires sterile diluents like bacteriostatic water introduced gently against the vial wall under aseptic laminar flow conditions. PX1 Research provides research-grade SS-31 manufactured in the USA, verified through third-party RP-HPLC, mass spectrometry, and endotoxin analysis per lot, with same-day dispatch M–F from California and Arizona fulfillment centers.
Proper SS 31 reconstitution requires sterile diluents like bacteriostatic water introduced gently against the vial wall under aseptic laminar flow conditions. PX1 Research provides research-grade SS-31 manufactured in the USA, verified through third-party RP-HPLC, mass spectrometry, and endotoxin analysis per lot, with same-day dispatch M–F from California and Arizona fulfillment centers.
Reconstituting SS-31 (also known as Elamipretide or MTP-131) in a laboratory setting requires strict adherence to sterile techniques to preserve peptide secondary structure and avoid bacterial contamination. Lyophilized SS-31 presents as a dense, white powder or cake that exhibits high aqueous solubility due to its tetrapeptide structure containing basic amino acid residues.
For most in vitro assays and analytical procedures, 0.9% benzyl alcohol-preserved bacteriostatic water or sterile 0.9% sodium chloride (saline) serves as the primary diluent. Reconstitution should involve slow fluid injection along the inner glass wall of the vial, followed by gentle swirling rather than vigorous agitation to prevent mechanical shearing or foaming.
Once reconstituted, liquid aliquots of SS-31 maintain short-term stability at 2°C to 8°C for up to 30 days when prepared with bacteriostatic water. For long-term analytical storage, unpreserved solutions should be immediately aliquoted into single-use polypropylene tubes and stored at -20°C or -80°C to minimize degradation over extended experimental timelines.
SS-31 is a synthetic aromatic-cationic tetrapeptide (D-Arg-dimethylTyr-Lys-Phe-NH2) designed to target the inner mitochondrial membrane in preclinical research models. Investigators utilize research-grade SS-31 to evaluate cardiolipin binding affinity, mitochondrial electron transport chain efficiency, reactive oxygen species (ROS) scavenging, and cellular bioenergetics across various cell lines and tissue preparations.
Due to its alternating basic and aromatic amino acid motif, SS-31 freely penetrates cell membranes and selectively concentrates at the inner mitochondrial membrane independent of membrane potential. Understanding its biochemical properties is essential for accurate solution preparation, ensuring that experimental assays reflect precise stoichiometry and uncompromised peptide bioactivity.
To achieve optimal dissolution and maintain sterile conditions, laboratory personnel should conduct all reconstitution procedures within a certified Class II laminar flow hood using aseptic techniques. Begin by sanitizing the rubber stopper of the SS-31 vial with a 70% isopropyl alcohol wipe and allowing it to air dry completely.
Attach a sterile 21G to 25G needle to a calibrated laboratory syringe and draw the precise volume of chosen diluent—typically 1.0 mL to 2.0 mL per 10 mg vial. Insert the needle through the center of the rubber septum at a 45-degree angle, allowing the natural vacuum of the vial to draw the liquid in, while controlling the plunger so the stream flows gently down the internal glass wall.
After liquid transfer is complete, gently roll the vial between your palms or swirl it slowly on a flat surface until the lyophilized cake is fully dissolved into a clear, colorless solution. Never shake the vial forcefully, as excessive agitation can induce protein denaturation, aggregation, or micro-foaming that alters final concentration accuracy.
The selection of diluent depends directly on the intended research application, assay duration, and storage requirements. Bacteriostatic water containing 0.9% benzyl alcohol is the standard diluent for multidose research preparations because the antimicrobial agent inhibits bacterial growth during repeated vial entries over a 28-to-30-day refrigerated window.
For delicate cell culture models, enzymatic assays, or microfluidic applications where benzyl alcohol might exert cytotoxic effects, sterile non-preserved 0.9% sodium chloride or phosphate-buffered saline (PBS) is preferred. When using non-preserved aqueous buffers, the reconstituted solution must be used immediately or divided into single-use sub-aliquots for deep-freeze storage.
Researchers evaluating structural biology or precise mass spectrometry profiles should utilize ultra-pure, HPLC-grade sterile water for injection (WFI). Always verify buffer compatibility with the target assay before diluting large batches of peptides for research to ensure non-interference with downstream colorimetric or fluorometric reagents.
Accurate concentration calculations are vital for reproducible preclinical quantitative assays. When preparing a standard 10 mg vial of SS-31, adding 1.0 mL of diluent yields a stock concentration of 10 mg/mL (10 μg/μL). Adding 2.0 mL of diluent creates a stock concentration of 5 mg/mL (5 μg/μL).
To perform micro-volume working dilutions, utilize the standard concentration equation (C1 V1 = C2 V2). For example, if an in vitro assay requires a 100 μM working concentration in a 10 mL assay buffer, calculate the required stock micrometer volume based on the 639.8 g/mol molecular weight of SS-31 acetate salt.
To avoid repeated freeze-thaw cycles that destabilize the peptide backbone, immediately divide the reconstituted stock into low-binding microcentrifuge tubes in volumes matched to single experimental runs (e.g., 50 μL or 100 μL aliquots). Label every tube with peptide name, lot number, final concentration, diluent type, and date of reconstitution.
Lyophilized SS-31 powder exhibits excellent thermal stability when stored sealed in its original glass vial. Upon arrival at the research facility, desiccated vials should be stored at -20°C for routine short-term holding or -80°C for long-term storage exceeding six months. Protect the peptide from direct light exposure by storing vials in opaque cardboard boxes.
Reconstituted liquid SS-31 stored in bacteriostatic water remains stable at 2°C to 8°C for approximately 30 days. Unpreserved aqueous solutions stored at refrigerated temperatures degrade significantly faster and should be utilized within 24 to 48 hours to maintain nominal concentration integrity.
For extended liquid storage up to 6 months, sub-aliquots must be kept frozen at -20°C or -80°C. Avoid standard frost-free laboratory freezers, as their automated temperature cycling causes localized thawing that accelerates peptide hydrolysis and oxidation.
Improper handling during SS 31 reconstitution can compromise experimental outcomes and waste valuable laboratory resources. Be vigilant for the following procedural errors and physical warning signs:
Direct Liquid Jet Injection: Spraying diluent forcefully directly onto the lyophilized cake can disrupt non-covalent interactions and create persistent foam that obstructs precise pipetting.
Repeated Freeze-Thaw Cycles: Freezing and thawing liquid stock multiple times causes ice crystal formation that cleaves peptide bonds and reduces effective active concentration.
Cloudiness or Particulate Matter: A properly reconstituted SS-31 solution should be completely transparent and clear. Visible turbidity, discoloration, or undissolved particulates indicate precipitation, contamination, or peptide degradation; such vials must be discarded.
Unsterilized Vials or Equipment: Reconstituting outside a sterile field or reusing single-use syringes introduces bacterial endotoxins and proteolytic enzymes that rapidly digest small peptides.
Reliable preclinical outcomes depend entirely on purchasing verified, high-purity compounds. When sourcing mitochondrial research peptides, evaluate suppliers against stringent laboratory standards rather than marketing claims.
Purity Verification: Demand lot-specific reverse-phase high-performance liquid chromatography (RP-HPLC) chromatograms confirming a purity threshold of ≥98.0%.
Identity Confirmation: Ensure mass spectrometry (MS) reports verify the exact molecular mass (639.8 g/mol for SS-31 free base equivalent) without uncharacterized synthesis byproduct peaks.
Endotoxin Testing: Confirm bacterial endotoxin levels are quantified via Limulus Amebocyte Lysate (LAL) testing, verifying levels below 0.01 EU/μg for safe cell culture application.
Lot Traceability & Sourcing: Verify that manufacturing occurs in certified domestic facilities adhering to ISO 9001 quality management, complete with traceable lot numbers stamped on every vial.
Researchers looking to order 10 mg vials of SS-31 should inspect third-party certificates of analysis prior to completing procurement.
In addition to SS-31, researchers investigating cellular bioenergetics, mitochondrial signaling, and metabolic adaptation often utilize complementary peptides within the same experimental framework.
The MOTS-c research peptide is a mitochondria-derived peptide that encodes a 16-amino acid sequence involved in metabolic homeostasis and insulin sensitivity pathways. Investigators often run comparative assays evaluating nuclear-mitochondrial crosstalk alongside SS-31 treatment groups.
Similarly, Humanin peptide vials provide access to a 24-amino acid mitochondrial-derived peptide studied for cytoprotective and anti-apoptotic properties under metabolic stress. Review our full peptide research repository to access chemical documentation, sequence data, and technical whitepapers across our entire compound catalog.
PX1 Research is the premier USA supplier of high-purity analytical peptides engineered strictly for in vitro and laboratory research. When you buy SS-31 from our catalog, your order is fulfilled from our climate-controlled California or Arizona distribution hubs.
Every vial contains a precisely quantified lyophilized cake protected under inert nitrogen gas with crimped flip-off aluminum seals. Orders placed before 1:00 PM PST Monday through Friday dispatch same-day via tracked priority shipping, ensuring rapid domestic transit times.
To review current lot availability, download batch-specific COAs, or set up a bulk peptide procurement account for institutional orders, visit our complete peptide catalog today.
How do you perform ss 31 reconstitution in a lab setting?
SS 31 reconstitution involves sanitizing the vial septum with 70% isopropyl alcohol, inserting a sterile needle containing bacteriostatic water or saline, directing the liquid down the inner glass wall, and gently swirling the vial until the lyophilized powder fully dissolves into a clear solution.
What solvent is best for SS 31 reconstitution?
Bacteriostatic water (0.9% benzyl alcohol) is ideal for multi-use research vials stored under refrigeration. For alcohol-sensitive cell cultures or analytical assays, sterile 0.9% sodium chloride or HPLC-grade sterile water for injection should be substituted.
How should lyophilized SS-31 be stored upon arrival?
Lyophilized SS-31 powder should be stored desiccated at -20°C for short-term handling or -80°C for long-term storage exceeding six months. Protect vials from light and humidity exposure.
What is the stability of reconstituted SS-31 at 4°C versus -20°C?
Reconstituted SS-31 in bacteriostatic water remains stable at 2°C to 8°C (4°C) for up to 30 days. For long-term liquid stability up to 6 months, unpreserved single-use aliquots must be frozen at -20°C or -80°C.
Can SS-31 be frozen and thawed repeatedly after reconstitution?
No. Repeated freeze-thaw cycles cause physical stress and peptide bond cleavage that degrades solution concentration. Aliquot reconstituted liquid into single-use volumes immediately after initial dissolution.
How do I verify the purity of my SS-31 peptide lot?
Verify purity by examining the lot-specific Certificate of Analysis (COA) provided by PX1 Research. The COA provides independent RP-HPLC chromatograms verifying ≥98% purity, Mass Spectrometry confirming molecular weight, and LAL endotoxin testing results.
Is SS-31 soluble in standard aqueous laboratory buffers?
Yes. SS-31 is highly water-soluble owing to its basic aromatic-cationic structure. It dissolves rapidly in sterile water, normal saline, bacteriostatic water, and standard phosphate-buffered saline (PBS) at neutral pH.
How fast does PX1 Research ship SS-31 research vials?
PX1 Research dispatches orders same-day for purchases completed before 1:00 PM PST, Monday through Friday. All shipments ship via tracked domestic priority transit from our fulfillment centers in California and Arizona.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.