CJC-1295 with DAC Testing & Verification
Independent, third-party analysis of mail-in CJC-1295 with DAC samples by RP-HPLC-UV — confirming the vial actually holds the DAC-modified molecule, not the cheaper no-DAC version, and reporting purity and net peptide content.
What CJC-1295 with DAC is
CJC-1295 with DAC is a synthetic analog of the 1-29 fragment of growth hormone-releasing hormone (GHRH). It shares its tetrasubstituted GRF 1-29 backbone with the compound sold as 'CJC-1295 no DAC' (Mod GRF 1-29), but adds a Drug Affinity Complex: a maleimidopropionic acid linker conjugated through a lysine residue, designed to bind covalently to serum albumin. The full molecule comes to roughly 3647 Da. In practice, 'CJC-1295' listings on the research market may refer to either variant, and the DAC version typically sells for more — a combination that makes the with-DAC/no-DAC question the central identity issue for this compound. It is an investigational research compound, not an approved drug, and grey-market material carries no regulated identity or content guarantee.
Why get your CJC-1295 with DAC independently tested
- The no-DAC substitution question: because the DAC version commands a higher price than chemically similar Mod GRF 1-29, there is a direct financial incentive to fill 'with DAC' vials with the cheaper no-DAC peptide. The DAC group changes the molecule's retention time on reversed-phase HPLC, so an identity check against a certified with-DAC reference standard answers whether the linker-bearing molecule is actually present.
- Incomplete DAC conjugation: the maleimidopropionic acid linker is attached in a separate conjugation step during manufacture, and incomplete conjugation leaves unmodified backbone peptide in the product. That unconjugated material appears as a distinct peak, and the chromatographic purity figure (area %) quantifies how much of the vial is the intended conjugate versus everything else.
- Underfilling of a premium product: higher-priced peptides are the natural target for short fills. The net-peptide assay reports the measured milligrams of peptide in the vial you send, so the labeled quantity can be checked rather than assumed.
- Label mg vs. salt and water weight: lyophilized material carries acetate counter-ion, residual moisture, and excipient mass that all count toward gross weight but not toward peptide content. The net-peptide assay isolates the peptide fraction, exposing any gap between the printed milligrams and the real peptide mass.
What we measure on CJC-1295 with DAC
Every CJC-1295 with DAC certificate reports exactly three results by reversed-phase HPLC with UV/diode-array detection at 214 nm. Identity is established by matching your sample's retention time and UV spectrum to a certified CJC-1295 with DAC reference standard — a match that simultaneously rules out the no-DAC variant, which elutes differently; chromatographic purity is reported as the area percent of the main peak relative to total integrated peak area; and the net-peptide assay reports the milligrams of peptide present per vial.
Every result is issued as a certificate of analysis you — or anyone you forward it to — can verify cryptographically. Reporting identity, purity, and milligram content is the point: a vial can be pure and still underfilled, so we report all three. More on purity vs. net-peptide content and how to read a peptide COA.
Our scope — stated plainly
Testing is RP-HPLC-UV against a certified reference standard. A qualified CJC-1295 with DAC standard may need to be sourced before analysis, which can affect turnaround; we will confirm with you first. KMD Analytical is an independent laboratory; we do not perform mass spectrometry, sterility, endotoxin, heavy-metal, or residual-solvent testing.
KMD is an independent RP-HPLC-UV lab. We do not run LC-MS / mass-spec, sterility, endotoxin, or heavy-metal testing. If your job needs a capability we don't have, we'll say so.
CJC-1295 with DAC testing — FAQ
Can RP-HPLC-UV really tell with-DAC from no-DAC material?
Yes. The maleimidopropionic acid linker and its lysine attachment make the with-DAC molecule chemically distinct from Mod GRF 1-29, and that difference shifts its reversed-phase retention time. Comparing your sample against a certified with-DAC reference standard shows whether the sample co-elutes with the genuine conjugate or with the unmodified backbone. As with all our identity work, this is a retention-time and UV-spectral match, not a mass-spectrometry confirmation.
Do you verify that the DAC actually binds albumin?
No — albumin-binding is a functional property, and we do not run functional or biological assays. What we verify is chemical: that the material in your vial matches the certified CJC-1295 with DAC reference standard by retention time and UV spectrum, which confirms the DAC-bearing molecule is what is present.
My vendor just says 'CJC-1295' — which variant should I select on the order form?
Select the variant the vendor charged you for; if the listing said DAC or the price was at the DAC tier, order the with-DAC test. If it is genuinely unclear, note that on your submission — because the two variants resolve chromatographically, the analysis will show which one the sample matches either way.
What would incomplete conjugation look like on my certificate?
It shows up in the purity result: unconjugated backbone peptide elutes as a separate peak from the DAC conjugate, so a vial containing a mix reports a lower main-peak area percent, with the additional peak visible on the chromatogram. The identity result tells you whether the main peak is the conjugate at all.
Other peptides we test
Retatrutide · Cagrilintide · Tesamorelin · BPC-157 · see the full panel.