Two catalog entries can share “CJC-1295” in the title while referring to different requested identities. For procurement, the words “with DAC” and “without DAC” are a starting point for clarification, not a complete structural specification. Before comparing prices, make sure each quotation describes the item you actually requested.
What the DAC distinction tells you—and what it does not
The original CJC-1295 research describes an albumin-binding GHRH analog. That is the relevant historical context for the DAC-related identity question; it does not prove that a current catalog item has the same structure. See the original CJC-1295 identification paper. This guide uses that distinction only for material identification, not for advice on use in people.
Commercial “no DAC” wording should not be treated as a universal structural definition. Ask for the full proposed sequence and modifications. Do not automatically replace the requested material with another peptide name just because a search result, forum or supplier shorthand treats the names as interchangeable.
Use two separate RFQ lines
| Field | With-DAC request | Without-DAC request |
|---|---|---|
| Catalog reference | Link to the with-DAC item | Link to the without-DAC item |
| Full identity | Request sequence, termini and exact DAC-related modification | Request sequence and termini; ask what “without DAC” means for this item |
| Structure reference | Ask which stated identity the identifier represents | Confirm independently; do not copy identifiers from the other line |
| Chemical form | Record the proposed form and any stated counterion | Record separately, even if the proposed form is similar |
| Quantity and package | Write amount basis and container count | Use the same fields, without assuming interchangeable material |
| Document scope | Ask for available evidence linked to the offered lot | Ask for the separate lot and available records |
The short name should not override the specification
Write the exact catalog title in the first line of the inquiry and place the structural clarification beneath it. If the supplier proposes a sequence or modification that differs from the protocol, leave the original request intact and record the proposal as a deviation. A corrected quote should show which version is being offered and which version you accepted.
Ambiguous naming can otherwise travel through the entire order: the quotation copies the short name, the invoice copies the quotation and the delivered label copies the invoice. Agreement between three repeated labels is not independent confirmation of the underlying material identity.
Ask what the analytical record actually addresses
Request the available batch-linked identity record and ask the supplier how it supports the specified material. Avoid asking only whether “a COA is included.” A summary document may list a product nickname while leaving the sequence, modification or analytical scope unclear. The question is whether the record provides enough information for your laboratory’s reviewer to assess the requested identity.
Keep an example report separate from the proposed batch record. If no lot has been allocated, record that limitation instead of marking the documentation review complete. If a reported value conflicts with the quoted identity, ask for a written explanation and an updated, traceable document rather than informally editing the report yourself.
An inquiry template that avoids silent substitution
Please quote the linked CJC-1295 item as a separate line. Confirm the full sequence, termini, exact modification and proposed chemical form. Explain what the DAC designation means for this specific listing. State the offered quantity basis, packaging, allocated-lot status and available identity documents. Flag any proposed substitution or unresolved identity field.
Use the with-DAC listing for one line and the without-DAC listing for the other. Ask for two separate confirmation records even when the same supplier handles both requests. This preserves a clear audit trail if one item is available and the other is not.
Before releasing a purchase request
- The requested identity and offered identity have been compared explicitly.
- Every unresolved field has an owner and a follow-up question.
- The quotation and document scope refer to the same item.
- A proposed alternative has not been accepted merely because its short name looks familiar.
Editorial scope: research-material procurement and document review. Not medical guidance, dosing instructions or a claim of suitability for human use. Requirements and availability must be confirmed for the quoted material.
