An aliquot is a portion taken from a larger sample. Its lineage describes how it came into existence, including the parent material and the event that separated it. That relationship remains important after the containers move to different locations.
Distinguish ancestry from a similar-looking name
TU Delft’s Geoscience and Engineering sample-management guidance uses parent and child names to reconstruct the origin of subsamples. Its examples concern geological materials; the transferable idea is a retrievable relationship between a source sample and its descendants.TU Delft GSE — Sample Management (opens in a new tab)
In a peptide notebook, the relationship can live in a structured field or a linked preparation record. It does not have to be encoded entirely inside a long identifier, provided another reader can follow it reliably.
A name such as S12-A may suggest that S12 was the parent. The record should establish that fact explicitly, since a familiar naming pattern can also be mistyped or reused.
Keep the source vial, a preparation made from it and a portion of that preparation distinguishable. They are related physical entities rather than three interchangeable names for one container.
Record the event that creates separate histories
Consider an original example: preparation P12 is divided into portions P12-A and P12-B on 20 September. Both children inherit the documented history of P12 up to that event, but later observations belong to the individual portions.
| Entity | Relationship | Later event |
|---|---|---|
| P12 | Parent preparation | Split documented in notebook entry N44 |
| P12-A | Child of P12 | Transferred to analytical sequence Q6 |
| P12-B | Child of P12 | Retained in its recorded storage location |
A later measurement of P12-A is a result for that analysed portion. Whether it represents P12-B requires a sampling argument and consideration of the histories after separation.
Record the person, event time and relevant transfer details at the split. The purpose is to reconstruct the relationship, not to infer an approved aliquoting procedure from the notebook format.
Represent pooling without losing either parent
Pooling creates a different relationship: one new sample can have several parents. A single parent field is inadequate if it silently discards one contributing source.
For example, pool R3 made from portions A7 and B9 should retain both links and the recorded contributions. Calling it A7-new would conceal B9 even if the person who prepared it remembers the mixture.
If the contributions are uncertain, preserve that uncertainty. A total pool volume cannot reconstruct each contribution unless other information supplies the missing quantities.
Test the record in both directions
Choose an analysed child and trace backwards to the source vial and its associated documents. Then start at that vial and identify the descendants that may be relevant to a later investigation.
The reverse search matters if a parent record is corrected or a handling concern is identified. A system that only stores a child’s current location may make affected descendants difficult to find.
Retain consumed or discarded children in the documentary history rather than deleting their existence. Their physical availability and their role in an experiment are separate facts.
The useful outcome is a connected history: which material produced which portion, when the relationship was created and where each independent branch can be followed next.
Sources and further detail
- TU Delft GSE — Sample Management (opens in a new tab)
Official university guidance checked for parent–child naming and reconstructable sample lineage. Geological examples support the documentary principle, not peptide handling conditions.
Sources checked 20 September 2026. Worked records are original hypothetical examples, not Novum operating procedures or actual customer events. This article has not undergone independent scientific peer review.