A multi-peptide assay found a large difference between polypropylene and two glass vial types.
What the study actually tested
A published guidance study on peptides used in mass-spectrometry assays compared recovery after storage in polypropylene, ordinary glass, and deactivated glass vials. The experiment used a 50 fmol/µL sample and 15 repeated LC–MS/MS analyses at hourly intervals over 15 hours. The authors classified signal decay of less than 5%, 5–50%, and more than 50% as stable, slow decay, and fast decay, respectively. The counts below describe peptides classified as unstable in that panel. This is a comparison of the full sample-handling system, not a chemical purity comparison of three peptide lots.
Numbers worth reading in context
| Study measure | Reported result |
|---|---|
| Polypropylene | 1 unstable peptide |
| Ordinary glass | 13 unstable peptides |
| Deactivated glass | 14 unstable peptides |
The counts make the practical point: even a vial marketed for analytical use can change which peptides remain measurable. In the same paper, two hydrophobic example sequences were highlighted in the handling analysis. Adsorption and recovery are sequence and condition dependent, so the observed one-versus-13/14 result cannot be turned into a rule that all polypropylene vials are suitable or all glass vials fail.
What to put in the RFQ or experiment plan
When requesting material for a low-concentration LC–MS assay, identify the planned vial and tube materials, stock concentration, diluent, hold time, and transfer steps. Ask the analytical team to compare a fresh standard against a stored and transferred standard in the actual container. Record whether any internal standard was added before or after the potential loss point; a late-added standard may miss an earlier adsorption loss.
Evidence boundary
The figures are counts in the published test panel, not percentage losses, and they are not NHD product measurements. They support method qualification under the buyer’s own conditions.
Sources and next step
Primary research: Recommendations for the generation, quantification, storage and handling of peptides used for mass spectrometry-based assays. These external figures are not test results for an NHD lot.
Related NHD guide: read the related article. For a material-specific question, request a written quotation with the sequence, amount, intended use, and required records.
Sources & editorial method
AI-assisted writing and source verification. Numerical claims were checked against the linked full-text records, with source inconsistencies identified in the article. This is not independent scientific peer review or verification of a supplied lot.
1 linked records are listed in the references below. Read the editorial and AI-assistance policy.
How to interpret this article
The figures are counts in the published test panel, not percentage losses, and they are not NHD product measurements. They support method qualification under the buyer’s own conditions.
Research-use boundary: Catalog materials discussed on this website are for laboratory research, development and manufacturing use only, not for human or veterinary use. This content is not medical advice and does not provide administration instructions.
