Cold-chain freight (revision 13)
Old revision·17:54, 7 May 2025·SupplyWatchSuri
| Cold-chain freightLogistics | |
|---|---|
A passive shipper holds temperature for a designed duration, not indefinitely. | |
| Passive systems | Insulation plus phase-change material |
| Active systems | Powered refrigeration |
| Evidence of performance | A temperature record, not a cold pack |
| Topic infobox · conventions | |
Cold-chain freight is transport under controlled temperature. For peptides it is used to limit the degradation routes — deamidation, oxidation, aggregation — whose rates rise with temperature, and its performance is a matter of record rather than of appearance.[1]
A passive shipper is insulation plus a phase-change material, designed to hold a temperature range for a stated duration under a stated ambient profile. It does not hold indefinitely, and a shipment that takes longer than the design duration is outside the qualification whatever the pack looks like on arrival.[2]
The presence of a cold pack is therefore not evidence that a cold chain was maintained. The evidence is a temperature record, from a logger or an indicator, covering the whole of transit. See Temperature excursion.[2]
Passive and active systems
[edit]Passive shippers are qualified by testing against defined ambient profiles: a summer profile, a winter profile, and a duration. Qualification states what the system will do under those conditions, and nothing about what it will do outside them.[2]
The coolant matters. Gel packs conditioned to refrigerator temperature hold a chilled range; frozen packs can take contents below the intended range, and freezing is a distinct hazard for a solution. Phase-change materials formulated to melt at the target temperature avoid both extremes.
Active systems maintain temperature by refrigeration and can hold it as long as they are powered. They are used for high-value or long-duration shipments and are uncommon in research-chemical supply.[1]
Monitoring
[edit]| Device | What it records |
|---|---|
| Single-use threshold indicator | Whether a threshold was crossed |
| Time–temperature indicator | Cumulative exposure above a threshold |
| Electronic data logger | A full temperature profile with timestamps |
| Nothing | Nothing |
A threshold indicator that has not tripped establishes that a specific threshold was not crossed, which is genuinely informative and is much less than a profile. A logger record is the strongest evidence available and is uncommon outside pharmaceutical distribution.[2]
Reports submitted to this wiki that mention temperature control most often mention the state of the coolant on arrival. That is a weak observation: a pack can be solid on arrival after a period at ambient if it was frozen at dispatch, and can be liquid on arrival without the contents having exceeded the intended range.[3]
See also
References
- ^ a b International Council for Harmonisation, Q1A(R2): Stability Testing of New Drug Substances and Products (2003).
- ^ a b c d United States Pharmacopeia, General Chapter <1079>, Risks and Mitigation Strategies for the Storage and Transportation of Finished Drug Products.
- ^ PeptidePedia Wiki community test-report tally, 2024–2026 (self-reported; see Project:Sourcing guidelines).