Well inside class limit. Worth noting that the class limits are set by mass rather than globally, because the same ppm is a different number of daltons at 340 and at 4,800.
ppm_error
Mass accuracy and calibration drift. Keeps a running distribution of ppm error by instrument class.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
11
n=11
Annotations
287
n=287
Median purity submitted
99.26%
n=11
Suppliers covered
9
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.
Instrument was evidently in calibration on the day. A run of results at this accuracy across a laboratory's sequence is the background against which an excursion becomes interpretable.
A single excursion of this size against a clean run of prior results on the same instrument is a calibration event with a date on it. The laboratory's own sequence log would place it; the index does not hold one.
Worth noting the sign. Calibration drift is usually one-directional across a sequence, so an excursion in the same direction as the laboratory's recent mean is a drift and one against it is something else.
+36.8 ppm is outside the class limit and outside what a calibrated instrument should produce at this mass. Before anyone reads it as a compound difference: calibration drift on PeptideMeter's side is far more likely. The chromatography is normal and retention at 17.27 min is where Semaglutide belongs.
Index data team
Recorded as an identity-not-established finding rather than an identity failure, per rule AX-R01. A re-measurement has been requested from the submitter.
Identity confirmed, purity 98.72 %, mass balance closed. This record is complete against the index definition of complete and there is nothing outstanding on it.
Identity confirmed and purity at 97.34 %. The two answer different questions — what it is, and how much else is in it — and a record carrying both is the version worth citing.
Identity confirmed, purity 98.87 %, mass balance closed. This record is complete against the index definition of complete and there is nothing outstanding on it.
The distribution of ppm error by instrument class in this index is wide enough that a single figure like +25.4 ppm carries little on its own. What carries is whether the same instrument produced similar excursions on adjacent runs, and the laboratory page has that.
-15.5 ppm is outside the class limit and outside what a calibrated instrument should produce at this mass. Before anyone reads it as a compound difference: calibration drift on Medutest's side is far more likely. The chromatography is normal and retention at 6.61 min is where TB-500 belongs.
Index data team
Recorded as an identity-not-established finding rather than an identity failure, per rule AX-R01. A re-measurement has been requested from the submitter.
Mass, retention and impurity profile all agree on this record. Three independent constraints pointing the same way is the strongest identity evidence the index publishes.
The index records this as identity not established. That is a statement about the evidence, not about the material, and the distinction is the whole reason the status vocabulary has four values instead of two.
Showing 12 distinct comments of 287 annotations by this handle.