Does a shrunken cake mean the lot failed identity?

No. Appearance after shipping is not a mass result. Quarantine a wet cake or a broken seal and follow the receipt note. Identity remains the lot file.

Should a cold vial be warmed quickly to drive off moisture?

No. The storage guide says not to heat a very cold vial. Let it sit sealed in a dry place.

Glossary · 2026-09-24

Scientific lead: Alice Kay, Ph.D.

Hygroscopic peptide solid, laboratory note

Hygroscopic means a solid can take up water from the air. Residual water speeds hydrolysis of the peptide bond, which is why lyophilized research peptides are stored sealed, away from moisture and from unnecessary light. A cake that looks different after a cold parcel is not an identity test. Match the vial to its Certificate of Analysis when a lot is published.

Receipt steps are in peptide storage for Canadian laboratories and lyophilized research peptides. This term does not list a drying procedure or a solvent. See also hydrolysis. Research use only.

Published lot files for this catalogue are indexed in the certificates library. This definition does not add a report, and it does not assign a task identifier. Research use only.

Frequently asked questions

Does a shrunken cake mean the lot failed identity?: No. Appearance after shipping is not a mass result. Quarantine a wet cake or a broken seal and follow the receipt note. Identity remains the lot file.
Should a cold vial be warmed quickly to drive off moisture?: No. The storage guide says not to heat a very cold vial. Let it sit sealed in a dry place.

Research use only. BlueNex Labs does not provide medical or veterinary advice. Confirm your institution’s policies before purchase. How a comparison or class note is checked sits on documentation standards. The biochemist of record is Alice Kay, Ph.D.