SS-31 Cost Per mg — How to Compare Suppliers Fairly

At a glance

Calculating the true cost per milligram of SS-31 (elamipretide) requires accounting for active peptide purity, moisture content, and trifluoroacetic acid (TFA) salt weight.

A vial labeled as containing 10 mg of raw lyophilized powder may only contain 7 mg to 8.5 mg of actual target peptide sequence once non-peptide counter-ions and bound water are subtracted.

Low-cost vendors frequently omit quantitative net peptide content testing, making their advertised cost per gross milligram misleading compared to fully assayed reagents.

PX1 Research provides batch-specific, independent third-party HPLC purity chromatograms, mass spectrometry verification, and endotoxin assay reports for every single lot.

Laboratories can review batch availability and current tier options directly on our dedicated SS-31 product page or browse our entire catalog of research peptides.

What is SS-31 (Elamipretide) in preclinical research?

SS-31, also known in scientific literature as elamipretide or Szeto-Schiller 31, is a synthetic tetrapeptide (D-Arg-dimethylTyr-Lys-Phe-NH2) studied extensively in mitochondrial biology and cellular bioenergetics models. Its primary structure incorporates alternating aromatic residues and basic amino acids, enabling it to selectively target the inner mitochondrial membrane.

In cell culture and animal models, researchers utilize SS31 to investigate cardiolipin interactions, electron transport chain efficiency, reactive oxygen species (ROS) attenuation, and mitochondrial membrane potential preservation under ischemic or oxidative stress conditions.

Because preclinical protocols rely on precise molar concentrations to yield reproducible data, obtaining high-purity reagents with fully characterized mass fractions is essential. Comparing vendors based solely on surface-level pricing without analyzing actual net peptide yield can compromise assay accuracy and budget forecasts.

How do you calculate true SS-31 cost per mg?

Comparing supplier prices requires a standardized mathematical framework that converts advertised gross mass into true active peptide yield. The price listed on a commercial product page reflects the total gross mass of the lyophilized cake, which includes the active peptide sequence, bound counter-ions (such as trifluoroacetate), and residual moisture.

To calculate the true cost per active milligram, apply the following standard laboratory conversion formula:

True Cost per Active mg = Listed Vial Price / (Gross Vial Weight in mg × HPLC Purity Fraction × Net Peptide Content Fraction)

For example, if a vial contains 10 mg of total lyophilized powder with an HPLC purity of 98% (0.98) and a Net Peptide Content (NPC) of 80% (0.80), the true active peptide mass is 10 mg × 0.98 × 0.80 = 7.84 mg. Dividing the total vial price by 7.84 mg yields the actual cost per milligram of target peptide sequence.

Without accounting for NPC, buyers routinely overpay by 15% to 30% on a net-active basis when purchasing low-grade materials from vendors that list only gross weight.

Why does gross mass differ from net peptide content?

During solid-phase peptide synthesis (SPPS), basic amino acid residues—such as the arginine and lysine present in the SS-31 sequence—form ionic bonds with trifluoroacetic acid (TFA) during the cleavage and reversed-phase high-performance liquid chromatography (RP-HPLC) purification stages.

When the final purified peptide fraction is lyophilized, these TFA counter-ions remain electrostatically bound to the peptide backbone. In addition, lyophilized cakes absorb atmospheric water vapor, contributing non-peptide mass to the final gross balance weight.

As a result, a 10 mg cake of lyophilized material consists of three distinct components: the target amino acid sequence (typically 70% to 85% by weight), counter-ions (10% to 20% by weight), and residual moisture (3% to 8% by weight). High-tier research suppliers calculate and disclose these proportions using elemental analysis or Quantitative Amino Acid Analysis (AAA).

How do counter-ions and moisture affect experimental accuracy?

When preparing stock solutions for in vitro bioenergetic assays or enzyme kinetics, reconstituting lyophilized powder based on gross mass under-concentrates the active compound if counter-ion weight is ignored. If a protocol calls for a 10 mM stock solution of elamipretide, using gross mass without adjusting for net peptide content can result in an actual concentration of only 7.5 mM to 8.2 mM.

This variance leads to inconsistent experimental outcomes, non-reproducible IC50 calculations, and skewed baseline measurements across research trials. Ensuring that your supplier provides a lot-specific Certificate of Analysis (COA) containing exact net peptide content allows researchers to weigh and dilute samples with complete precision.

To review verified analytical reports and lot data before ordering, visit our 10 mg SS-31 reagent page.

What criteria should you use to evaluate SS-31 suppliers?

To ensure your research budget is spent effectively, evaluate vendors using structured, objective criteria rather than relying on marketing claims or unverified discount codes. Standardize your procurement review against the following performance standards:

1. Purity Verification: Demand lot-specific RP-HPLC chromatograms showing sharp peak separation and a minimum sequence purity of 98.0%.

2. Structural Identity: Require High-Resolution Mass Spectrometry (HRMS) or Electrospray Ionization Mass Spectrometry (ESI-MS) spectrum data matching the theoretical molecular weight of SS-31.

3. Net Peptide Content (NPC): Ensure the supplier reports exact net peptide percentage via AAA or elemental analysis to enable accurate cost-per-mg calculations.

4. Endotoxin Control: Confirm Chromogenic LAL testing results below 0.01 EU/mg, preventing unwanted immune activation in sensitive cell culture protocols.

5. USA Synthesis & Cold-Chain Storage: Verify domestic synthesis and cold-chain handling to prevent chemical degradation during transit.

6. Traceability and Support: Mandate batch-coded vials with direct digital access to complete analytical COA packages.

What red flags should buyers avoid when purchasing SS-31?

The online peptide market contains numerous resellers that prioritize low upfront prices over chemical transparency. Recognizing common red flags protects your facility from low-quality materials and invalid experimental data:

Red Flag 1: Claims of '100% Purity'. No chemical synthesis yields 100% pure peptide material post-lyophilization. Legitimate suppliers state actual HPLC purity percentages alongside net peptide content.

Red Flag 2: Generic or Recycled COAs. Many vendors post a single static COA on their website for years. A true laboratory supplier generates a distinct COA for every single production lot.

Red Flag 3: Missing Endotoxin Data. For cellular and mitochondrial assays, bacterial lipopolysaccharide (LPS) contamination can ruin cell viability and invalidate bioenergetic assays.

Red Flag 4: Unlabeled Vial Weights. Vendors that fail to state whether advertised quantities represent gross mass or net active content leave buyers unable to calculate fair cost per milligram.

Red Flag 5: Lack of Domestic Infrastructure. Overseas dropshippers often subject delicate peptides to thermal stress during extended customs holds, causing peptide degradation before arrival.

How does analytical testing guarantee true active yield?

Independent third-party analytical testing is the only definitive method to confirm peptide purity and mass yield. RP-HPLC measures chemical purity by separating the target sequence from truncated peptide fragments, deletion sequences, and chemical impurities generated during synthesis.

Mass Spectrometry (MS) confirms identity by measuring the exact mass-to-charge ratio (m/z) of the molecule. When paired with amino acid analysis, these methods establish the exact quantity of active sequence inside each vial.

PX1 Research subjects every batch of SS31 to rigorous independent validation. We publish complete HPLC chromatograms, mass spectra, and endotoxin assay values for complete verification prior to purchase. Explore our full library of analytical standards and mitochondrial research reagents.

Which related peptides are studied alongside SS-31?

In cellular bioenergetics and metabolic longevity research, scientists frequently cross-reference SS-31 with other mitochondrial-targeted compounds to analyze synergistic cellular pathways.

Mitochondrial-Derived Peptides (MDPs) such as MOTS-c and Humanin are commonly investigated alongside SS-31 in metabolic regulation, metabolic flexibility, and cellular stress response models. Researchers comparing these compounds can review our extended technical documentation in the PX1 Research Library to evaluate sequence properties and experimental guidelines.

Ordering SS-31 from PX1 Research

PX1 Research provides high-purity, laboratory-grade SS-31 supplied as lyophilized powder in standardized 10 mg analytical vials. Designed specifically for in vitro and preclinical research applications, every lot undergoes strict domestic synthesis standards and complete third-party validation.

Orders placed before 3:00 PM PST Monday through Friday ship same-day from our dual distribution hubs in California and Arizona. Products are packaged in climate-controlled, protective shipping containers to maintain structural integrity throughout domestic transit.

Every vial features a batch-specific QR code linking directly to its third-party HPLC, MS, and endotoxin reports. Institutional procurement departments and high-volume laboratories requiring custom batch sizes or bulk pricing schedules can contact our support team directly through our wholesale inquiry portal.

To review live batch availability, examine lot COAs, or buy research-grade reagents, order your 10 mg SS-31 vials directly from PX1 Research today.