Twenty Vendors, Twenty Vials

Part 1 — The Ledger

The submitted sample: the weakest link in the whole system

What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.

Part 2 — Explainers

Why two wavelengths on one run would settle several arguments

Non-chromophoric components — counter-ions, salts, some excipients — contribute mass to the vial and nothing at all to the chromatogram.

Part 3 — Analytics

Three services, one lot, and a spread of two and a half points

Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.

Part 4 — The Ledger

Six words a verification badge would need to mean anything

What a verification mark would have to carry to be checkable: a date, a lot, a method, a submitter and a link to the report.

Part 5 — The Ledger

Reproducibility, measured rather than assumed

The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and published each method alongside each result.

Part 6 — Analytics

Reproducibility, measured rather than assumed

Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.

Part 7 — The Ledger

A tested vial is evidence about a vial

What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.

Part 8 — The Supply Chain

The submitted sample: the weakest link in the whole system

Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s control and outside its records.

Part 9 — Explainers

Retention time is not identity

Matching a retention time against a standard is evidence of consistency, not proof of identity. Two different species can elute at the same time on one method.

Part 10 — The Ledger

How a claim degrades between the bench and the listing

A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on sale is the lot that was tested.

Part 11 — Analytics

The badge economy, and what it is actually certifying

A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on sale is the lot that was tested.

Part 12 — The Supply Chain

Same material, different gradients, different answers

The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and published each method alongside each result.