Batch
Lot intake
Each incoming lot is assigned a Nexus batch ID before it enters inventory review.
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Nexus publishes branded Certificates of Analysis with HPLC purity, mass spectrometry identity confirmation, retention time, and batch traceability. Supplier-branded documents stay internal; the customer-facing record is normalized into the Nexus QA system.
Certificate of Analysis (COA) verification at Nexus Laboratory is the documented analytical chemistry for independently verified research-compound batches, comprising HPLC area-percent purity measurement, mass spectrometry identity confirmation, and endotoxin screening where applicable. Each catalog lot receives a Nexus batch ID and a public status route; finalized records publish a branded Certificate of Analysis, while pending certificates are labeled without assay values. Researchers can confirm published purity and identity records without login.
For field-level interpretation, read the purity vs assay and net peptide content guide. HPLC area percent, assay language, and net-content wording stay separate until a finalized batch record visibly states the field.
The four release gates stay visible as one method story: lot intake, HPLC purity, mass spectrometry identity, the endotoxin screen, then a public COA for independently verified lots.
A clean run shows one dominant peak for the target compound and minor impurity peaks. The dominant peak area relative to total integrated area is reported as HPLC purity.
View published COAsBatch
Each incoming lot is assigned a Nexus batch ID before it enters inventory review.
Purity
Reverse-phase HPLC area-percent purity is measured by an independent third-party laboratory and checked against the release threshold.
Identity
Observed mass is compared against expected molecular mass to confirm compound identity. Both values are published on the Certificate of Analysis.
Screen
Additional release checks are tracked as part of the batch-status story.
Archive
Finalized Certificates of Analysis link from product pages and resolve through batch verification URLs. Pending certificates remain clearly labeled and no login is required.
Independent lab partner
HPLC + MS analysis on each independently verified release batch, published through the Nexus COA record.
Visit Janoshik AnalyticalNexus publishes batch records around a named laboratory partner, not an anonymous third-party claim. Janoshik Analytical is an independent analytical laboratory whose public testing catalog includes peptide purity and composition analysis, GLP-1 blind testing, BPC-157 analysis, endotoxin analysis, and TAMC/TYMC sterility testing. Its public verification flow is built around task-level report authenticity, including a task number and unique key, which gives the COA story a concrete destination outside the Nexus site.
We use Janoshik because the methods map directly to the questions a research buyer needs answered before a batch is released: what compound is present, how pure the main peak is, whether mass identity aligns with the expected molecule, and whether additional panels such as endotoxin or microbial presence are required for the use case. The lab's peptide service pages list HPLC-based result formats for lyophilizate, including amount per vial and peptide purity, while the GLP-1 and BPC-157 pages name the target compounds and molecular weights that buyers expect to see reflected in a report.
The current Nexus certificate model tracks the release values that matter for catalog confidence: HPLC purity, MS identity, mass error, retention behavior, endotoxin screen, and sterility status.
A COA is useful only when the reader understands what the measurements mean. HPLC stands for high-performance liquid chromatography. In a peptide purity run, the sample moves through a column while different components separate over time. The output is a chromatogram: a trace with peaks. A clean sample should show one dominant peak for the target compound and only small secondary peaks for related impurities or byproducts. The retention time is where the main peak appears on the time axis. The area under that main peak, compared with the total integrated peak area, is reported as area-percent purity.
That purity number is not the same as identity. A sample can produce one dominant HPLC peak and still be the wrong compound. Mass spectrometry adds the identity check by ionizing the molecule and measuring the mass-to-charge signal. The result is interpreted against the expected molecular mass for the compound. When the observed mass aligns with the expected mass within a tight error range, the report supports that the material in the vial is the intended molecule rather than a mislabeled or structurally different peptide.
For Nexus, the core chemistry story is layered: HPLC describes the purity profile of the sample, while mass spectrometry helps confirm whether the measured material matches the expected molecule. A 99% HPLC result means the dominant integrated chromatogram peak accounts for roughly 99% of the measured peak area under that method. It does not mean every possible contaminant has been ruled out, and it does not replace identity confirmation. The right reading sequence is compound and batch ID first, HPLC purity and retention behavior second, mass identity fields third, and any additional panels such as endotoxin or microbial presence after that.
A purity number only means something when it is connected to a real lot, a recognizable method, and a report structure that can be inspected later. Janoshik's public raw-data convention reinforces that structure: analysis reports include sample information, method filenames, acquisition timestamps, chromatogram axes in minutes and mAU, and a peak table with retention time, area, and area-percent values. The same pattern appears inside every Nexus COA card — so you can inspect the lot, method, peak, mass fields, and release threshold before trusting the badge.
A sample moves through the column while related components separate into distinct signal bands.
The main integrated peak is compared with the total peak area to report area-percent purity.
Mass spectrometry checks whether the observed signal aligns with the expected molecule.
Read batch ID, HPLC purity, mass identity, and added panels as one layered record.
Additional screens such as endotoxin are read as release context, not as a replacement for identity.
Each card below uses a real Nexus COA record. Open a card to see the fields that matter: the purity peak, the acceptable release range, and the chromatogram pattern that signals a clean sample.
5 public COAs · Open record · Annotate fields5 public records · Tap Annotate COA for field notes · Open arrow for the full certificate
NEX-BPC-157-2026-0013
This peak = purity %. BPC 157 lot NEX-BPC-157-2026-0013 reports RP-HPLC purity at 99.65%, with the main peak retained at 12 min.
This range = acceptable. The COA release specification is >= 99.0% HPLC purity, and this lot clears that threshold at 99.65%.
Batch ID ties the report to one released lot. Expected mass is 1419.53 Da and observed mass is 1419.50 Da by Mass Spectrometry, ESI-TOF; endotoxin is < 1.0 EU/mg and sterility is Passed.
BPC 157 lot NEX-BPC-157-2026-0013 is the record being annotated. The purity callout points to the 99.65% RP-HPLC result and 12 min retention time. The acceptable-range callout compares that result with the >= 99.0% release specification. The identity callout checks the mass match: expected 1419.53 Da, observed 1419.50 Da.
NEX-SEMAGLUTIDE-2026-0076
This peak = purity %. Semaglutide lot NEX-SEMAGLUTIDE-2026-0076 reports RP-HPLC purity at 99.52%, with the main peak retained at 16.5 min.
This range = acceptable. The COA release specification is >= 99.0% HPLC purity, and this lot clears that threshold at 99.52%.
Batch ID ties the report to one released lot. Expected mass is 4113.58 Da and observed mass is 4113.46 Da by Mass Spectrometry, ESI-TOF; endotoxin is < 1.0 EU/mg and sterility is Passed.
Semaglutide lot NEX-SEMAGLUTIDE-2026-0076 is the record being annotated. The purity callout points to the 99.52% RP-HPLC result and 16.5 min retention time. The acceptable-range callout compares that result with the >= 99.0% release specification. The identity callout checks the mass match: expected 4113.58 Da, observed 4113.46 Da.
NEX-RETATRUTIDE-2026-0073
This peak = purity %. Retatrutide lot NEX-RETATRUTIDE-2026-0073 reports RP-HPLC purity at 99.49%, with the main peak retained at 17.8 min.
This range = acceptable. The COA release specification is >= 99.0% HPLC purity, and this lot clears that threshold at 99.49%.
Batch ID ties the report to one released lot. Expected mass is 4731.33 Da and observed mass is 4731.50 Da by Mass Spectrometry, ESI-TOF; endotoxin is < 1.0 EU/mg and sterility is Passed.
Retatrutide lot NEX-RETATRUTIDE-2026-0073 is the record being annotated. The purity callout points to the 99.49% RP-HPLC result and 17.8 min retention time. The acceptable-range callout compares that result with the >= 99.0% release specification. The identity callout checks the mass match: expected 4731.33 Da, observed 4731.50 Da.
NEX-TIRZEPATIDE-2026-0092
This peak = purity %. Tirzepatide lot NEX-TIRZEPATIDE-2026-0092 reports RP-HPLC purity at 99.55%, with the main peak retained at 17.5 min.
This range = acceptable. The COA release specification is >= 99.0% HPLC purity, and this lot clears that threshold at 99.55%.
Batch ID ties the report to one released lot. Expected mass is 4813.53 Da and observed mass is 4813.72 Da by Mass Spectrometry, ESI-TOF; endotoxin is < 1.0 EU/mg and sterility is Passed.
Tirzepatide lot NEX-TIRZEPATIDE-2026-0092 is the record being annotated. The purity callout points to the 99.55% RP-HPLC result and 17.5 min retention time. The acceptable-range callout compares that result with the >= 99.0% release specification. The identity callout checks the mass match: expected 4813.53 Da, observed 4813.72 Da.
NEX-AOD9604-2026-0008
This peak = purity %. AOD9604 lot NEX-AOD9604-2026-0008 reports RP-HPLC purity at 99.63%, with the main peak retained at 13.5 min.
This range = acceptable. The COA release specification is >= 99.0% HPLC purity, and this lot clears that threshold at 99.63%.
Batch ID ties the report to one released lot. Expected mass is 1815.07 Da and observed mass is 1815.16 Da by Mass Spectrometry, ESI-TOF; endotoxin is < 1.0 EU/mg and sterility is Passed.
AOD9604 lot NEX-AOD9604-2026-0008 is the record being annotated. The purity callout points to the 99.63% RP-HPLC result and 13.5 min retention time. The acceptable-range callout compares that result with the >= 99.0% release specification. The identity callout checks the mass match: expected 1815.07 Da, observed 1815.16 Da.
Receipts, not promises. Nexus separates verified records from pending certificates by tying each release decision to a batch status, an analytical method where finalized, and a customer-facing COA trail.
No false certainty
Nexus lots are assigned a batch status before they are shown to customers. Published COA records are built from independent analytical values; lots awaiting final paperwork remain certificate pending and do not display assay values. The model is catalog-wide visible status, with verified claims reserved for verified lots.
Rejected, not discounted
If a batch fails its release threshold, it does not become an alternate-price product and it does not quietly roll into inventory. The batch is rejected, quarantined from customer-facing stock, and reviewed against the supplier and logistics record. If affected customer communication is required, the notification explains the batch, the failure mode, and the corrective action in plain language.
Batch history stays inspectable
Nexus retains COA data as a batch history, not just a sales asset. Current product pages should show the active batch, while older batch records remain available through the verification/archive path when the corresponding lot has already shipped. That retention policy matters because trust is cumulative: a buyer should be able to see the pattern of release decisions over time, not only the newest purity number.
Now that the proof system is visible, continue into the catalog and inspect each active batch record from the product page.
