u/medutest_mel

I would not post that as a finding. It is a single result and the template asks you to say so.

Carryover from a previous high-concentration injection looks exactly like a small impurity.

nora_lundgren is right — the integration choice is a decision and it should be stated alongside the result.

a blank injection between samples costs four minutes and settles most arguments

Left up and added to the vendor source page log. Thanks for paying for it and posting it.

Merged with the other thread on the same batch so the results sit together.

UV response is not uniform across species. At 214nm you are looking at the peptide bond, which is why it is the working wavelength for this class; at 280nm you only see tryptophan, tyrosine and phenylalanine.

Not convinced by that integration. Dropping the baseline there absorbs part of the shoulder into the main peak.

date of analysis matters as much as the number

report the method or do not report the number

That is a waist figure in the weight column. Easy mistake and it makes the chart look dramatic.

reproducibility beats resolution if you only get one of them

I would not read the price difference as a quality signal. Most of it is the consultation model, not the vial.

What would you do differently, specifically?

What is the one column you added late and wish you had from the start?

Left up and added to the vendor source page log. Thanks for paying for it and posting it.

GL Biochem came back 99.6% on a claimed 99.0%, which is agreement not a discrepancy

Agreed. One line a week that actually gets written beats an elaborate template abandoned in month two.

Left up and added to the vendor source page log. Thanks for paying for it and posting it.

Is the compound still on the shortage list where you are?

Retitled — the original stated a discrepancy the numbers do not show.

Same. The WWB results have been sitting in a tight band across lots, which is the useful shape.

a result with no batch number is about a vial nobody can identify

Is that the same lot as the one in the thread from last month?

First result I ever posted here got asked for the batch number and the claim. Fair, and my posts have been better ever since.

Retitled — the original stated a discrepancy the numbers do not show.

Did they name the facility?

Merged with the other thread on the same batch so the results sit together.

Area percent and net peptide content are different measurements and most reports give one. Quote which, or the comparison downstream is meaningless.

axis labels or the trace is decoration

Potency and sterility testing on the finished preparation are separate from any certificate covering the starting material. Ask which you are being shown.

That is area percent, not mass percent. The trace cannot give you the second one.

Agreed, and it is why BCH printing the column and gradient on the certificate is genuinely useful rather than decorative.

hazard_ratio_hal is right — the integration choice is a decision and it should be stated alongside the result.