Selank COA Lookup: Verify Your Lot Number
Every batch of research-grade Selank synthesized by PX1 Research undergoes strict analytical validation to guarantee sequence integrity, purity, and safety compliance. Laboratory investigators can use this lookup guide to locate their unique selank coa lot number, match it directly against our third-party testing database, and interpret key analytical metrics including HPLC chromatography, mass spectrometry, and endotoxin assays.
Quick answer
Every batch of research-grade Selank synthesized by PX1 Research undergoes strict analytical validation to guarantee sequence integrity, purity, and safety compliance. Laboratory investigators can use this lookup guide to locate their unique selank coa lot number, match it directly against our third-party testing database, and interpret key analytical metrics including HPLC chromatography, mass spectrometry, and endotoxin assays.
Key takeaways
- To perform a complete [certificate of analysis](/research-peptides/what-is-a-coa-for-peptides) (COA) lookup, researchers must first locate the lot identifier printed on their physical shipment.
- PX1 Research maintains complete batch transparency by archiving all third-party analytical reports in an open, searchable portal.
- High-Performance Liquid Chromatography (HPLC) is the gold standard method for establishing chemical purity in synthetic peptides.
- While HPLC confirms chemical purity by separating molecular species, Mass Spectrometry (MS) confirms molecular identity by measuring the exact mass-to-charge ratio ($m/z$) of the primary analyte.
Locating Your Lot Number on PX1 Selank Vials
To perform a complete certificate of analysis (COA) lookup, researchers must first locate the lot identifier printed on their physical shipment. Every single vial of PX1 Research peptides is clearly labeled on its side with a high-contrast label containing the compound name, target mass quantity, and a unique 6- to 8-character batch code.
On vials containing Selank 10mg, the lot number is situated directly adjacent to the product QR code on the primary label. This identifier usually follows an alphanumeric syntax (e.g., PX-SEL-XXXX). Ensuring that you enter the exact characters into our lookup system guarantees that you pull the precise analytical data corresponding to the exact manufacturing run executed in our ISO 17025 accredited facilities.
Accessing the Live Analytical COA Database
PX1 Research maintains complete batch transparency by archiving all third-party analytical reports in an open, searchable portal. Investigators evaluating compounds across our catalog can navigate to the central PX1 Certificate of Analysis Hub to retrieve live PDF documentation corresponding to their specific lot number.
When referencing a batch, entering your full **selank coa lot number** into the search query returns the complete document suite. This includes raw high-performance liquid chromatography (HPLC) chromatograms, electrospray ionization mass spectrometry (ESI-MS) spectra, and Chromogenic Limulus Amebocyte Lysate (LAL) endotoxin quantification. If you require bulk documentation for institutional procurement or audit compliance, you may also request consolidated documentation via our wholesale portal.
Interpreting HPLC Purity Metrics for Research Selank
High-Performance Liquid Chromatography (HPLC) is the gold standard method for establishing chemical purity in synthetic peptides. When analyzing your Selank COA, the HPLC section presents a visual chromatogram alongside a peak integration table detailing retention times and peak areas.
For research-grade Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro), PX1 mandates a minimum purity threshold of 99.0%. In the integration table, the major peak corresponding to the target heptapeptide sequence should represent ≥99% of the total integrated peak area at 214 nm UV absorption. Minor secondary peaks represent trace synthesis deletion sequences or minor truncation fragments. Reviewing these chromatograms ensures that baseline drift is minimal and that no significant organic impurities contaminate your laboratory assay system.
Evaluating Mass Spectrometry (MS) Sequence Identity
While HPLC confirms chemical purity by separating molecular species, Mass Spectrometry (MS) confirms molecular identity by measuring the exact mass-to-charge ratio ($m/z$) of the primary analyte. Selank has a theoretical chemical formula of $\text{C}_{33}\text{H}_{57}\text{N}_{11}\text{O}_{9}$ with an exact theoretical monoisotopic mass of 751.44 Da and an average molecular weight of approximately 751.90 g/mol.
When examining the mass spectrum on your Selank COA, look for the dominant observed mass peak corresponding to the protonated ion $[M+H]^+$, typically appearing at $m/z = 752.4 \pm 0.5\text{ Da}$, or the doubly charged ion $[M+2H]^{2+}$. Matching the observed theoretical mass against the calculated mass confirms that the vial contents match the intended heptapeptide sequence without unexpected amino acid substitutions or improper protective group removals during solid-phase peptide synthesis (SPPS).
Endotoxin Limits and Bioburden Verification
For sensitive cell culture, enzymatic, and preclinical in vitro assays, bacterial endotoxin contamination (lipopolysaccharides derived from Gram-negative bacterial outer membranes) can severely distort experimental outcomes by triggering non-specific immune cascades. PX1 Research tests every lot of synthesized peptide for residual endotoxins using USP <85> compliant kinetic chromogenic LAL assays.
The results of this analysis are documented clearly on your certificate. Standard specification for PX1 research compounds dictates an endotoxin level below $<0.05\text{ EU/mg}$. Achieving this low threshold ensures that observed experimental signals in your laboratory models are attributable strictly to the target peptide structure rather than underlying bacterial pyrogen contamination.
Physicochemical Properties of Synthetic Selank
Selank is a synthetic heptapeptide derived by fusing the endogenous immunomodulatory sequence Tuftsin (Thr-Lys-Pro-Arg) with a C-terminal Pro-Gly-Pro tripeptide sequence added to enhance enzymatic stability against circulating peptidases. Supplied as a lyophilized white powder, the compound exhibits high solubility in aqueous buffers due to basic amino acid residues (Lysine and Arginine).
Preclinical and in vitro studies investigate Selank within systems evaluating neuropeptide degradation rates, GABAergic receptor modulating pathways, and cytokine expression profiles in cell cultures. Research compounds manufactured by PX1 are synthesized in GMP-compliant USA facilities, ensuring consistent batch-to-batch physical characterization across all research peptides.
Comparative Analysis: Selank, Semax, and Related Analogues
In neurochemical and peptide stability research, Selank is frequently evaluated alongside other synthetic regulatory peptides that incorporate enzymatic stabilization motifs. Understanding the structural differences between these molecules helps researchers select the appropriate compound for specific assay protocols.
While Selank is derived from human Tuftsin to target immunomodulatory and peptidase degradation pathways, its companion compound Semax is an heptapeptide analogue derived from ACTH (4-10) with an added C-terminal Pro-Gly-Pro tail studied in preclinical models of trophic factor expression. Both compounds differ structurally from short endogenous fragments like original Tuftsin or ACTH fragments, as the addition of the Pro-Gly-Pro sequence markedly increases resistance to enzymatic cleavage in serum and cellular homogenates. Researchers can explore detailed comparative studies in our centralized PX1 Research Library.
Laboratory Reconstitution Protocols and Calculations
Lyophilized Selank requires proper reconstitution in sterile laboratory solvents prior to use in analytical or cell culture procedures. Common laboratory diluents include sterile 0.9% Sodium Chloride for injection or Bacteriostatic Water containing 0.9% benzyl alcohol to inhibit microbial growth during multi-use experimental protocols.
To calculate precise working concentrations for your laboratory assays, researchers should utilize our interactive Reconstitution Calculator. Always ensure that the diluent is gently run down the inner glass wall of the vial rather than sprayed directly onto the lyophilized cake, followed by gentle swirl agitation—never aggressive vortexing—to preserve tertiary structural stability.
Handling, Storage, and Stability Guidelines
Lyophilized research peptides must be stored under controlled environmental conditions to prevent premature hydrolysis or oxidative degradation. Upon receipt at your laboratory facility, sealed vials of Selank should be stored at $-20^\circ\text{C}$ for short-term preservation or $-80^\circ\text{C}$ for long-term storage.
Once reconstituted, aqueous solutions of Selank display reduced stability compared to their dry state. Reconstituted aliquots should be kept at $4^\circ\text{C}$ and used within 14 to 30 days depending on the choice of bacteriostatic solvent. Repeated freeze-thaw cycles must be strictly avoided by freeze-drying or dividing reconstituted stock solutions into single-use experimental working volumes.
Frequently Asked Questions
Where do I find the selank coa lot number on my PX1 vial?
The lot number is printed on the primary label on the side of the 10mg vial, positioned directly next to the product barcode and storage temperature icons.
What is the purity specification for PX1 Research Selank?
PX1 Research mandates a minimum purity threshold of ≥99.0% as verified by reversed-phase High-Performance Liquid Chromatography (RP-HPLC).
How can I verify the mass spectrometry data on my COA?
Check the observed mass peak on the ESI-MS chart within your COA. Selank has a theoretical monoisotopic mass of ~751.44 Da, so the dominant $[M+H]^+$ peak will typically appear at $m/z = 752.4 \pm 0.5\text{ Da}$.
What endotoxin testing methodology is used for PX1 peptides?
PX1 uses kinetic chromogenic Limulus Amebocyte Lysate (LAL) assays in accordance with USP <85> standards, certifying endotoxin levels below $<0.05\text{ EU/mg}$.
Are PX1 Research peptides tested by an independent third party?
Yes, every batch undergoes independent third-party verification in an ISO 17025 accredited analytical laboratory before being released for purchase.
What should I do if my lot number does not return a result in the lookup tool?
Double-check the character formatting entered into the lookup tool. If the lot code is still unverified, contact PX1 compliance support directly with your order number for manual COA extraction.
How should lyophilized Selank be stored prior to laboratory research?
Lyophilized Selank powder should be stored desiccated at $-20^\circ\text{C}$ or $-80^\circ\text{C}$ to maintain maximum chemical stability until reconstitution.
Can I request bulk lot documentation for institutional ordering?
Yes, institutional researchers and laboratory procurement specialists can request batch COA packages directly through the PX1 wholesale account portal.
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