What is the thermal exposure on a Xianning to Spain lane in summer?

For reference: Xianning · Spain.

I would like help reading this properly rather than being told what conclusion to reach.

I have the full report including the method section, so I can quote specifics if that helps.

How should I read this, and where are the traps?

If temperature history matters to you, buy a data logger. It is the only way to know.

Anything shipped in solution is a different risk category, because hydrolysis and deamidation proceed in the aqueous phase and are strongly temperature-dependent.

Stated carefully, arrhenius behaviour means the degradation rate roughly doubles per ten degrees. A week at thirty degrees is therefore a meaningful exposure for a solution and an immaterial one for a dry solid.

Solid-state stability of lyophilised peptides at ambient temperature is documented in formulation studies with residual moisture as the dominant variable.

Reconstituted material has a genuine cold-chain requirement and it starts the moment water is added.

Solutions are a different question and deserve the worry the solids get.

The short version: a spent cold pack on arrival is expected, the solid does not mind, and the pack was never going to last twelve days.

A single-use temperature logger costs a few pounds, records the whole journey and converts an argument into a record. If the history matters, this is the answer.

A single phase-change pack in a thin-walled box holds below ten degrees for roughly one to two days at twenty-five degrees ambient, and under a day at thirty-five. On a nine-to-fourteen-day lane the material is at ambient for most of the journey whatever was packed with it.

The caveat is that a warm transit is survivable for a solid and materially different for a solution.

The domestic leg is the part you control. Refrigerate it promptly.

edited 10 Feb 2025 by rukhsana_iqbal — removed a claim I could not source