7.28 EU/mg from an older lot. Endotoxins are heat-stable and drift is rare. If this matches fresh-lot median from the same supplier, the number is stable.
underfill_3to1
Gravimetric fill checks. Under-fill outnumbers over-fill three to one.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
11
n=11
Annotations
4
n=4
Median purity submitted
99.10%
n=11
Suppliers covered
7
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.
| Supplier | Records | Median purity |
|---|---|---|
| TFC | 3 | 99.11 |
| QYB | 2 | n<3 |
| SWB | 2 | n<3 |
| WWB | 1 | n<3 |
| GL Biochem | 1 | n<3 |
| Homopeptide | 1 | n<3 |
| QSC | 1 | n<3 |
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.
Endotoxin tested twice on this lot with varying EU/mg spread. Endotoxin variability in retained samples is larger than most labs acknowledge and the single measurement here is not definitive.
7.46 EU/mg is at the sensitivity limit of Janoshik's LAL method. The true value is unspecified; treating this as a point estimate is overstating precision.
5.20 EU/mg is elevated relative to the index median and the record shows no depyrogenation step. If this material will be reconstituted in aqueous buffer for any downstream use, that endotoxin load is a risk.