Epitalon Technical Documents: COA, HPLC, LC-MS and Batch Review

Direct answer

An Epitalon technical-document review should connect the intended tetrapeptide, sequence, specification, batch number and analytical evidence before an individual result is accepted. For the currently published batch LJE2026041901, the available document set includes a Certificate of Analysis (COA), HPLC record, LC-MS record and product specification. These files answer different questions and should be reviewed as one traceable set.

The specification defines the expected attributes and acceptance criteria. The COA reports results assigned to the identified batch. HPLC supports chromatographic purity review, while LC-MS provides mass-related evidence supporting identity. Matching the product name, AEDG sequence, CAS number, molecular information, batch number and dates across the records creates a clearer review trail than relying on a catalog purity statement or generic supplier checklist.

Epitalon identity and specification baseline

The public product page uses the name Epitalon, while the spelling Epithalon may appear in searches and established article URLs. Naming alone should not determine identity. Buyers should anchor the review to the sequence, molecular information, supplied form and applicable specification.

Field	Current product information	Document review point
Product	Epitalon peptide raw material	Confirm that Epitalon or Epithalon naming refers to the same specified material in the transaction.
CAS number	307297-39-8	Check consistency where the CAS number appears and review it together with the sequence.
Sequence	Ala-Glu-Asp-Gly (AEDG)	Confirm the four-residue sequence and residue order across applicable identity records.
Systematic name	L-alanyl-L-alpha-glutamyl-L-alpha-aspartyl-glycine	Use as an additional identity cross-check where stated.
Molecular formula	C14H22N4O9	Compare with the molecular information used to interpret identity evidence.
Molecular weight	390.35 g/mol	Compare with the expected and observed mass-related information in the LC-MS record.
Purity specification	≥98.0% by HPLC	Compare the acceptance criterion with the batch COA and HPLC record.
Storage information	Published for the supplied lyophilized form on the product page	Confirm the applicable condition on the current label, specification and shipment documents.
Testing support	Third-party laboratory testing supported	Define the requested test scope, sample identity and reporting arrangement for the actual inquiry.

Current Epitalon batch document set

The following records are publicly available for technical review. All four files identify batch LJE2026041901 and show a review date of April 19, 2026. Before procurement, confirm that the lot currently offered is the same lot represented by these records.

Document	Batch	Primary review purpose	File
Certificate of Analysis	LJE2026041901	Compare reported batch results with the specification and confirm product and batch identifiers.	View Epitalon COA
HPLC	LJE2026041901	Review the chromatogram and reported purity result in relation to the COA and method information.	View Epitalon HPLC
LC-MS	LJE2026041901	Review mass-related evidence supporting the identity assigned to the batch.	View Epitalon LC-MS
Specification	LJE2026041901	Identify attributes, methods or method references and acceptance criteria used to evaluate the batch.	View Epitalon Specification

Step 1: confirm naming, sequence and batch linkage

Begin with identifiers rather than the reported purity result. Epitalon and Epithalon are spelling variants encountered in product and search terminology, but the review should establish that the documents represent the intended AEDG tetrapeptide. Confirm the Ala-Glu-Asp-Gly sequence, CAS number where stated, molecular formula, molecular weight and supplied material form.

The COA, HPLC, LC-MS and specification should use a consistent product or sample designation and should link to batch LJE2026041901. Also check report numbers, sample identifiers, test dates, review dates and page counts where available. An analytical file without a clear sample or batch link cannot independently establish that it represents the material offered.

Step 2: compare the specification with the COA

The specification states what is tested and the applicable acceptance criteria. The COA reports the results assigned to a particular batch. Review the documents side by side and confirm:

• the product, sequence and batch identifiers are clear;
• test names, units and reporting conventions have the same meaning;
• each required result is present and legible;
• the method or method reference corresponds to the specification;
• the purity criterion has not been replaced by a general catalog statement;
• the batch conclusion follows the listed results;
• dates and review controls are complete for the document format.

If the buyer applies a separate internal specification, compare it independently. A result that meets one specification does not automatically meet a different buyer-defined criterion.

Step 3: read HPLC as chromatographic evidence

The current product information states a purity specification of at least 98.0% by HPLC. The corresponding HPLC file should be used to review the chromatographic evidence behind the reported batch result. Relevant checks include sample and batch identification, chromatographic conditions, detection information, retention data, peak table, integration and final reported purity where available.

An HPLC area percentage is method-specific. It should not automatically be interpreted as peptide content by mass, a complete material balance or proof that every possible impurity has been identified. The result is most useful when the method and reporting basis are understood and the chromatogram is traceably linked to the same COA batch.

Step 4: use LC-MS for identity support

LC-MS provides mass-related evidence that can support the assigned identity of the AEDG tetrapeptide. Review the expected molecular information, observed ions or deconvoluted mass where reported, charge-state interpretation and the connection between the analyzed sample and batch LJE2026041901.

LC-MS and HPLC answer different questions. A mass result supporting identity does not by itself establish chromatographic purity, while an HPLC main peak does not by itself confirm the complete sequence or molecular identity. Interpret both records with the specification and COA.

Step 5: review versions, dates and traceability

A complete review trail should identify which specification version governed the batch, when the sample was tested and how each analytical record connects to the released COA. If a file is corrected or replaced, its revision should be distinguishable from the earlier version.

The published files for batch LJE2026041901 are batch-specific evidence for that lot. They may illustrate the document format available for review, but they should not be represented as analytical proof for a different lot. Confirm the offered batch and obtain its applicable records before shipment.

Storage, packaging and shipment checks

Confirm the supplied material form, total quantity, container or aliquot arrangement, label, batch number, storage temperature, protective packaging, destination and requested transport conditions. These details should be agreed for the actual transaction rather than inferred from an unrelated sample or document.

Storage guidance must match the supplied form. Conditions for a prepared solution should not replace the instructions applicable to unopened lyophilized material. The buyer remains responsible for destination-market registration, import and handling requirements.

Questions to resolve before procurement

• Which Epitalon batch is currently offered?
• Do the product and documents identify the same AEDG sequence?
• Are COA, HPLC, LC-MS and specification linked to the same batch or sample?
• What HPLC method and reporting basis support the purity result?
• How does the LC-MS report support the expected molecular information?
• What material form, quantity, packaging and aliquoting configuration are requested?
• Which storage and transport conditions apply to the supplied form?
• Which documents must accompany the buyer's quality review and shipment?

Document-review warning signs

• Epitalon or Epithalon naming is used without a matching sequence or material definition;
• the COA and analytical files show different batch or sample identifiers;
• a purity value is provided without the applicable method or chromatogram;
• LC-MS is presented as proof of chromatographic purity;
• HPLC is presented as complete sequence or molecular-identity confirmation;
• the specification and COA use different tests, units or criteria without explanation;
• a document from one batch is used to represent another lot;
• storage guidance for another material form is substituted for the supplied product;
• certification or regulatory claims are made without current supporting evidence.

FAQ

Which documents are currently published for Epitalon batch LJE2026041901?

The public set includes a COA, HPLC record, LC-MS record and specification. Confirm that the lot offered for the actual transaction matches these files.

Are Epitalon and Epithalon the same spelling in procurement records?

Both spellings may appear in search and commercial terminology. Buyers should verify the intended AEDG sequence and molecular information rather than relying on the name alone.

What does the Epitalon COA establish?

The COA reports results assigned to the identified batch. It should be reviewed with the governing specification and supporting analytical files.

Does HPLC purity equal total peptide content?

Not necessarily. HPLC area percentage depends on the stated method, detection and integration basis and should not automatically be treated as assay by mass.

Why are both HPLC and LC-MS reviewed?

HPLC supports chromatographic purity review, while LC-MS provides mass-related evidence supporting identity. Neither record replaces the other.

Can batch LJE2026041901 documents represent another batch?

No. They may illustrate the available document format, but batch-specific analytical evidence applies only to the identified batch.

What should an Epitalon inquiry include?

Provide the required quantity, material form, target specification, testing and document needs, packaging or aliquoting requirements, destination and schedule.

Review the product and batch files

• Epitalon product technical information
• Quality documentation support
• Submit a qualified Epitalon B2B inquiry

For qualified B2B partners only. Not for personal use or direct consumer sale. Document availability, batch, quantity and supply details are confirmed for the actual inquiry.