Evaluating a MOTS-c certificate of analysis (COA) requires analyzing batch-specific analytical metrics, including reverse-phase high-performance liquid chromatography (RP-HPLC) purity, mass spectrometry (MS) sequence identity, and endotoxin quantification. PX1 Research provides lot-specific, third-party laboratory verification for every batch of MOTS-c synthesized in ISO 17025 accredited domestic facilities.
Evaluating a MOTS-c certificate of analysis (COA) requires analyzing batch-specific analytical metrics, including reverse-phase high-performance liquid chromatography (RP-HPLC) purity, mass spectrometry (MS) sequence identity, and endotoxin quantification. PX1 Research provides lot-specific, third-party laboratory verification for every batch of MOTS-c synthesized in ISO 17025 accredited domestic facilities.
A MOTS-c certificate of analysis (COA) is an official analytical document published by an independent ISO 17025 accredited testing facility that verifies the chemical identity, purity profile, sequence accuracy, and microbiological cleanliness of a synthesized batch of MOTS-c peptide. Every valid COA must include batch-matched chromatograms, mass spectra, and quantitative endotoxin testing results.
For research institutions evaluating mots-c certificate of analysis documentation, simple vendor claims of purity are insufficient. Rigorous analytical validation demands full transparency regarding test methodology, equipment calibrated against NIST traceable standards, and explicit lot numbers that tie the physical vial directly to the raw analytical output. PX1 Research subjects every batch of mitochondrial peptides to dual-stage third-party testing to ensure that data submitted for publication or assay development remains reproducible and free from confounding chemical impurities.
When reviewing a mots-c-coa, investigators should systematically verify five key parameters: purity percentage via RP-HPLC, molecular weight verification via mass spectrometry, bacterial endotoxin load via Limulus Amebocyte Lysate (LAL) testing, appearance/solubility metrics, and net peptide content analysis. Failure in any single metric invalidates the batch for quantitative preclinical research.
Reverse-phase high-performance liquid chromatography (RP-HPLC) is the gold standard method for determining the chemical purity of synthetic peptides. For MOTS-c—a 21-amino acid peptide encoded by the mitochondrial 12S rRNA locus with the primary sequence Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg—RP-HPLC separates the intact target peptide from synthesis truncations, deletion sequences, and oxidation byproducts.
In a standard RP-HPLC assay for MOTS-c, the compound is loaded onto a C18 stationary phase column and eluted using a hydrophobic gradient of acetonitrile containing 0.1% trifluoroacetic acid (TFA). The ultraviolet detector monitors absorbance at 214 nm (peptide backbone) and 280 nm (aromatic side chains of Trp and Tyr). Pure MOTS-c produces a single sharp peak with a narrow half-height width.
PX1 Research enforces a strict internal benchmark of ≥98.0% purity for all research peptides added to our catalog. On the chromatographic output, the integrated area under the curve (AUC) of the primary MOTS-c peak must account for at least 98% of the total integrated signal. Minor secondary peaks represent minor deletion peptides or oxidation states (such as methionine sulfoxide) and must remain strictly beneath 0.5% individual area thresholds to prevent interference with receptor-binding assays or mitochondrial metabolic tracking.
While RP-HPLC establishes chemical purity by measuring total contaminants, it cannot definitively confirm that the primary peak contains the exact amino acid sequence of MOTS-c. Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) or electrospray ionization mass spectrometry (ESI-MS) is required to verify exact molecular mass.
The theoretical monoisotopic mass of the un-modified 21-amino acid MOTS-c sequence (C108H152N28O25S2) is approximately 2174.6 Da. On a standardized ESI-MS report attached to a MOTS-c certificate of analysis, the spectrum will display distinct mass-to-charge (m/z) ratio peaks corresponding to protonated ions, such as [M+H]+, [M+2H]2+, and [M+3H]3+.
A valid COA must show observed mass values matching the calculated theoretical mass within a strict tolerance window (typically ±1.0 Da). Deviations beyond this range indicate incorrect synthesis sequences, incomplete deprotection of side-chain protecting groups during solid-phase peptide synthesis (SPPS), or significant amino acid substitution errors. Through our research library, investigators can cross-reference analytical mass spectra against expected theoretical fragmentation patterns to confirm structural fidelity before initiating cell culture assays.
Bacterial endotoxins—lipopolysaccharides (LPS) derived from the outer membrane of Gram-negative bacteria—are common contaminants in laboratory synthesis pipelines. Even trace amounts of endotoxin induce profound inflammatory cascades in macrophage assays, alter mitochondrial membrane potential, and skew metabolic biomarker readouts, rendering in vitro data invalid.
PX1 Research conducts quantitative kinetic chromogenic Limulus Amebocyte Lysate (LAL) testing on every batch of MOTS-c. The resulting COA lists the measured endotoxin content expressed in Endotoxin Units per milligram (EU/mg). Standard industrial research grade peptides frequently contain endotoxin levels exceeding 10–50 EU/mg, which is unacceptable for sensitive biological assays.
Our target specification requires endotoxin levels to test below 0.01 EU/mg. Maintaining endotoxin levels beneath this threshold ensures that observed cellular responses—such as changes in AMP-activated protein kinase (AMPK) phosphorylation or oxygen consumption rate (OCR)—are attributable solely to the MOTS-c peptide rather than LPS-induced Toll-like receptor 4 (TLR4) activation.
Beyond HPLC purity, MS identity, and endotoxin screening, a rigorous COA includes physical specifications and net peptide content quantification. MOTS-c is supplied as a lyophilized (freeze-dried) white to off-white powder. The freeze-drying process uses controlled sublimation parameters to yield a stable cake with low residual moisture content (typically <5.0%).
Synthetic peptides manufactured via SPPS typically exist as TFA salts due to the cleavage reagents used during synthesis. The presence of TFA counterions means that 1.0 mg of total lyophilized powder does not equal 1.0 mg of pure target peptide sequence. A complete COA provides elemental analysis, amino acid analysis (AAA), or nitrogen content determination to quantify the true net peptide content (typically 75%–85% target peptide by weight, with the remainder composed of bound moisture and TFA salts).
Principal investigators utilizing our wholesale lab account portal for high-throughput screens can request explicit net peptide content calculations per lot to ensure precise molar concentrations when preparing master stock solutions for quantitative assays.
When selecting mitochondrial research compounds, laboratories often evaluate MOTS-c alongside other peptides in the same functional class, such as Humanin, SS-31, and non-peptidic metabolic activators like SLU-PP-332. Understanding how their analytical profiles and mechanisms differ is critical for assay design.
While MOTS-c is a 21-amino acid nuclear-encoded mitochondrial-derived peptide that targets the folate cycle and activates AMPK in metabolic studies, Humanin is a 24-amino acid mitochondrial peptide primarily evaluated for cytoprotective and anti-apoptotic pathways. SS-31 (Elamipretide) is a small synthetic tetrapeptide designed to selectively bind cardiolipin in the inner mitochondrial membrane, stabilizing cristae structure independent of transcription factor translocations.
From an analytical standpoint, short tetrapeptides like SS-31 present single, highly stable HPLC elution profiles, whereas larger peptides like MOTS-c contain multiple hydrophobic residues (Met, Trp, Tyr, Phe, Leu) that render them more susceptible to atmospheric oxidation if stored improperly. PX1 Research subjects all compounds across our all peptides directory to identical double-blind HPLC/MS validation standards to guarantee uniform purity regardless of sequence complexity.
Preclinical research indicates that MOTS-c acts as a signaling molecule regulating metabolic homeostasis. In vitro assays demonstrate that under metabolic stress, MOTS-c translocates from the mitochondria to the nucleus, where it binds to specific response elements and interacts with transcription factors such as NRF2.
In rodent models, administration of MOTS-c has been investigated for its capacity to enhance insulin sensitivity, modulate lipid accumulation, and improve exercise capacity by regulating glucose uptake in skeletal muscle tissues. Research models show that MOTS-c activates the 5'-AMP-activated protein kinase (AMPK) pathway independently of the classical upstream kinase LKB1, driving mitochondrial biogenesis.
Because these biochemical pathways are highly sensitive to compound concentration and purity, researchers require batch-specific analytical assurance. Using unverified peptides with lower purity or unmapped degradation products introduces confounding variables that compromise metabolic flux measurements and gene expression profiling.
To preserve the chemical stability documented on the MOTS-c COA, laboratory personnel must follow standardized storage and reconstitution handling procedures upon delivery. Lyophilized MOTS-c should be stored at -20°C or -80°C in a manual defrost freezer away from ambient light.
Prior to reconstitution, the vial must be allowed to equilibrate to room temperature inside a desiccator to prevent atmospheric moisture condensation on the cake. For reconstitution guidance, researchers can utilize our peptide reconstitution calculator to compute precise concentration values based on vial mass and solvent volume.
Reconstitution should be performed using sterile, bacteriostatic water or sterile phosphate-buffered saline (PBS, pH 7.4). If low solubility is observed due to the hydrophobic nature of certain MOTS-c domains, a minimal volume of dimethyl sulfoxide (DMSO, <0.5% final concentration in assay buffer) may be used to assist initial dissolution before diluting into final culture media. Reconstituted aliquots must be stored at -80°C to minimize freeze-thaw degradation cycles.
PX1 Research maintains rigorous quality assurance protocols to guarantee that every peptide delivered to academic, pharmaceutical, and private laboratories meets strict international analytical benchmarks. All MOTS-c synthesis occurs in cGMP-compliant facilities within the United States.
Our supply chain pipeline utilizes independent testing from ISO 17025 accredited testing laboratories. Every lot undergoes matrix-assisted identity testing, high-resolution HPLC purity profiling, and quantitative kinetic LAL endotoxin testing. Every customer receives complete, unredacted COA documentation matched precisely to their shipment lot number.
To support ongoing research workflows without delay, PX1 Research operates dual fulfillment hubs located in California and Arizona. Orders placed Monday through Friday ship same-day, ensuring rapid cold-chain transport and minimal transit degradation for temperature-sensitive compounds.
What does a mots-c certificate of analysis include?
A MOTS-c certificate of analysis (COA) includes batch-specific analytical metrics: RP-HPLC chromatography showing purity percentage (AUC ≥98%), electrospray ionization mass spectrometry (ESI-MS) confirming molecular weight (2174.6 Da), quantitative LAL endotoxin levels (<0.01 EU/mg), appearance metrics, net peptide content, and lot traceability data.
How do I verify a mots-c-coa for authenticity?
Authentic MOTS-c COAs should display a matching lot number printed directly on the physical vial label. The COA must originate from an independent, ISO 17025 accredited laboratory and contain full analytical raw data, including the complete HPLC chromatogram (with integration tables showing retention time and peak areas) and the mass spec peak printout, rather than simple summary text.
What is the target HPLC purity benchmark on a MOTS-c COA?
PX1 Research requires a minimum RP-HPLC purity benchmark of ≥98.0% for MOTS-c. The integrated primary peak area must represent at least 98% of the total UV absorbance signal at 214 nm, ensuring minimal presence of truncated deletion sequences or oxidized impurities in cell culture and preclinical assays.
Why is mass spectrometry critical on a MOTS-c certificate of analysis?
Mass spectrometry verifies exact chemical identity and molecular weight. While HPLC measures purity percentage, mass spectrometry confirms that the primary peak corresponds precisely to the 21-amino acid MOTS-c sequence (theoretical mass ~2174.6 Da), ruling out amino acid substitutions or incomplete deprotection.
What endotoxin threshold is acceptable for MOTS-c in vitro cell culture research?
For sensitive cell culture and metabolic research, endotoxin levels should ideally test below 0.01 EU/mg. Higher endotoxin levels introduce lipopolysaccharides (LPS) that activate inflammatory signaling pathways (such as TLR4), leading to false-positive or false-negative results in metabolic assays.
How should MOTS-c be stored upon arrival at the research facility?
Lyophilized MOTS-c should be stored at -20°C or -80°C in a dry environment protected from light. After reconstitution, stock solutions should be divided into single-use aliquots and maintained at -80°C to avoid repeated freeze-thaw cycles that promote peptide degradation.
What solvent is recommended for reconstituting MOTS-c for lab assays?
MOTS-c can be reconstituted using sterile bacteriostatic water, sterile deionized water, or phosphate-buffered saline (PBS, pH 7.4). For high-concentration stock solutions where hydrophobic aggregation occurs, adding a tiny fraction of laboratory-grade DMSO (<0.5% final assay concentration) can facilitate complete dissolution.
How does MOTS-c compare to other mitochondrial research peptides like SS-31?
MOTS-c is a 21-amino acid mitochondrial-derived peptide involved in nuclear translocation and metabolic/AMPK pathway regulation. In contrast, SS-31 (Elamipretide) is a synthetic tetrapeptide that targets inner mitochondrial membrane cardiolipin directly. Both peptides serve distinct, complementary roles in mitochondrial research.
Are PX1 Research MOTS-c batches manufactured in the USA?
Yes. All PX1 Research MOTS-c peptides are synthesized in cGMP-compliant domestic facilities within the United States and undergo independent verification at ISO 17025 accredited testing laboratories.
Can institution buyers request bulk lot COAs through PX1?
Yes. Institutional buyers and research facilities can request lot-specific analytical documentation, historical batch chromatography, and bulk pricing arrangements directly through the PX1 Research wholesale portal.
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.