Cold chain: difference between revisions
Diff·revision 28 → 29·12:11, 6 Aug 2025
Difference between revision 28 and revision 29 of Cold chain. 11 lines changed; the page grew by 1,034 bytes.
| Revision 28 — 17:51, 17 Jul 2025 RepackRadek (talk) clarify that "cold chain" without a logger is a claim, not a record 22,995 bytes +393 | Revision 29 — 12:11, 6 Aug 2025 ComparisonCato (talk) expand §Storage classes and their definitions 24,029 bytes +1,034 | ||
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| 136 | '''Documentation failure.''' A shipment may be correctly maintained and still be unusable in a regulated setting if the record is missing, unreadable or not attributable. Distribution guidance treats the record as part of the product's quality status, not as administrative overhead.{{r|eugdp2013}} | 136 | '''Documentation failure.''' A shipment may be correctly maintained and still be unusable in a regulated setting if the record is missing, unreadable or not attributable. Distribution guidance treats the record as part of the product's quality status, not as administrative overhead.{{r|eugdp2013}} |
| 137 | 137 | ||
| + | 138 | | Failure point | Characteristic mechanism | Detected by | | |
| + | 139 | |---|---|---| | |
| + | 140 | | Packing | Direct coolant contact; part-full payload | Payload logger | | |
| + | 141 | | Air freight | Extended hold at ramp temperature | Shipment logger | | |
| + | 142 | | Customs | Hold of unpredictable duration | Logger, if retrieved | | |
| + | 143 | | Courier depot | Unrefrigerated overnight storage | Shipment logger | | |
| + | 144 | | Doorstep delivery | Local ambient until collection | Nothing, in general | | |
| + | 145 | | Domestic refrigerator | Compartment gradient; door-shelf placement | Min–max thermometer | | |
| + | 146 | ||
| 138 | == Distribution outside regulated channels == | 147 | == Distribution outside regulated channels == |
| 139 | A substantial proportion of the material discussed on this wiki moves outside pharmaceutical distribution, and the cold-chain concept applies to it only partially. The differences are structural rather than incidental. | 148 | A substantial proportion of the material discussed on this wiki moves outside pharmaceutical distribution, and the cold-chain concept applies to it only partially. The differences are structural rather than incidental. |
| ⋮ | ⋮ | ||
| 142 | 151 | ||
| 143 | The product is generally lyophilised, which changes the physics substantially. A dry amorphous solid held below its glass transition temperature degrades orders of magnitude more slowly than the same peptide in solution, and its temperature sensitivity is correspondingly lower. This is the physical basis on which ambient shipment of dry peptide is defensible, and it is set out in detail at [[Lyophilisation]].{{r|ich_q1a}} | 152 | The product is generally lyophilised, which changes the physics substantially. A dry amorphous solid held below its glass transition temperature degrades orders of magnitude more slowly than the same peptide in solution, and its temperature sensitivity is correspondingly lower. This is the physical basis on which ambient shipment of dry peptide is defensible, and it is set out in detail at [[Lyophilisation]].{{r|ich_q1a}} |
| + | 153 | ||
| + | 154 | The defensibility is conditional and the conditions are not verifiable by the recipient. The glass transition temperature of a dry peptide matrix may be only tens of degrees above ambient; moisture ingress through a compromised closure lowers it further; and the material is unlikely ever to have had a stability programme establishing what it tolerates. A parcel that arrives warm has therefore experienced an exposure of unknown consequence rather than a demonstrably harmless one.{{r|ich_q1a,usp1079}} | |
| 144 | 155 | ||
| 145 | == References == | 156 | == References == |