Retention within the compound window is consistent with L-Glutathione (reduced) and consistent with several other things. It narrows the field; it does not close it.
RT_shift
Retention-time reproducibility. Collects the same compound across labs to see what moves.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
11
n=11
Annotations
14
n=14
Median purity submitted
98.97%
n=11
Suppliers covered
11
n=11
Section 2
Records submitted
A submitter chose to buy this material and to pay for this assay. That choice is the selection mechanism behind the whole index and it is not random.
Section 3
Annotations
Signed technical comments on records. The index does not moderate annotations for agreement with its own arithmetic, and several of these disagree with it. Where a handle has made the same point on several records, one instance is shown and the rest are reachable from the records themselves.
No void-volume marker in the sequence, so the retention axis is uncalibrated and the window comparison is weaker than it looks. This is a cheap fix and almost nobody does it.
System suitability with a retention-time acceptance criterion would catch this before the sample ran. Required by every pharmacopoeia, present on almost no research-peptide report.
Retention is the cheapest orthogonal check on identity available and the one most often discarded. A flag here is worth following up precisely because the check is so nearly free.
Retention within the compound window is consistent with Liraglutide and consistent with several other things. It narrows the field; it does not close it.
Retention plus a documented gradient plus a compound window is the best available substitute and it is not a good one. The index reports it as what it is.
19.92 min is outside the expected window for Enclomiphene citrate once normalised for Nordanalyt's 35 min gradient. Two thirds of retention flags in this index resolve to an undocumented column or temperature difference. It is the other third that matters.
The window on this compound is published on its own page with the method it was established on. A flag against it is a comparison, not a verdict.
Escalation on this rule means the index looks for a mass to resolve the question. Where a mass exists and agrees, the flag is recorded as a method note and the record stands.
19.71 min is outside the expected window for Tirzepatide once normalised for PeptideMeter's 28 min gradient. Two thirds of retention flags in this index resolve to an undocumented column or temperature difference. It is the other third that matters.
I collect the same compound across laboratories specifically to see what moves. Retention moves the most and it moves for reasons that are all documentable and almost never documented.
That matches my own notes on this compound.
Showing 12 distinct comments of 14 annotations by this handle.