A discontinued reagent can disappear from a catalogue while remaining central to an experiment or publication. Preserve the documents that describe the material actually used, together with their context, so that future readers are not left relying on a broken product link.
Identify the research record worth preserving
Cambridge University Libraries’ digital-preservation policy includes digital objects and their associated metadata, and emphasises integrity and managed, documented change. These principles explain why preserving a file also requires preserving enough context to understand it.Cambridge University Libraries — Digital Preservation Policy (opens in a new tab)
For a discontinued reagent, identify which studies used it and which documents establish its description. Prioritise the applicable specification, certificates, purchase and receipt identifiers, and material records linked to those studies.
Do not replace a historical product description with a successor product merely because the old link redirects there. The replacement may differ in molecular form, formulation or documentation.
Record the discontinuation information and its source separately. A product being unavailable does not establish that it was defective, that existing stock is unsuitable or that past results are invalid.
Build an archive that can be understood later
| Item | Context to retain |
|---|---|
| Specification | Issuer, version, date and applicability to the used material |
| Certificate or report | Document ID, product/lot/sample mapping and any revision history |
| Study connection | Experiments or publications using the material |
| Availability notice | What was discontinued and when that was communicated |
| Archive index | File descriptions, source locations and access restrictions |
A short index should explain unfamiliar filenames and identify which document answers which question. It should also distinguish supplied originals from laboratory summaries or annotated working copies.
If a catalogue page supplies context absent from the certificate, preserve an appropriate dated record of that context within applicable permissions. A saved page should retain its source and retrieval date rather than appearing to be an issuer-certified specification.
Where information was already missing, state that in the archive. The act of archiving does not justify reconstructing a sequence or analytical result from a newer product with a similar name.
Preserve files without changing their evidential role
Keep original files alongside any access copies created for readability or future software compatibility. Record transformations so a later reader can distinguish a converted file from the original supplied document.
A checksum can help detect whether a saved file has changed since a recorded point. It does not authenticate the document’s issuer or verify the chemical material described inside it.
Use institutional storage and retention arrangements appropriate to the research. A folder on one departing researcher’s laptop is a weak archive even if every file is named carefully.
Keep replacement decisions separate from history
If a later project needs an alternative, start a new material-selection record and link it to the historical archive. Do not edit the old material entry to make it describe the replacement.
A publication can accurately report that the original reagent is no longer commercially available while still providing the identity and evidence needed to interpret the work. Availability and reproducibility information should not be conflated.
The archive’s purpose is to preserve what was used and what was known about it. It supports later comparison without pretending that a discontinued material can always be recreated exactly from incomplete documentation.
Sources and further detail
- Cambridge University Libraries — Digital Preservation Policy (opens in a new tab)
Official indexed policy text checked for associated metadata, integrity and documented change; glossary also checked for fixity. The reagent archive is an original application, not an institutional retention mandate.
Sources checked 20 September 2026. Inventory examples are hypothetical research records, not Novum stock, fulfilment procedures or validated laboratory systems. This article has not undergone independent scientific peer review.