AssayIndex
Cross-section

Melanotan II by laboratory

The same compound measured by different laboratories on different gradients. Where the medians differ, the question is whether the material differed or the method did — and for Melanotan II, with a class minimum gradient of 22 min, the method is a live explanation.

77 recordsmedian 99.42 %spec 98.5 %
LaboratoryReportsGradientMS resolutionMedian purity %Published bias (pp)Bias-adjustedMethod suitability
Janoshik2730minHigh99.48+0.0099.48ADEQUATE
PeptideMeter1728minHigh99.39-0.0599.44ADEQUATE
VendorInvestigate1132minHigh98.99-0.1199.10ADEQUATE
Nordanalyt1035minHigh99.33+0.0299.31ADEQUATE
Medutest7 n=725minUnit99.43+0.0899.35ADEQUATE
Kestrel5 n=515minUnit99.93+0.2499.69BELOW CLASS MINIMUM
97.698.098.598.999.399.7100.1JanoshikJanoshik: Q1 99.17, median 99.48, Q3 99.69, n=27outlier 98.09outlier 98.20n=27PeptideMeterPeptideMeter: Q1 99.23, median 99.39, Q3 99.77, n=17outlier 97.91outlier 98.16n=17MedutestMedutest: Q1 99.38, median 99.43, Q3 99.69, n=7outlier 98.11n=7VendorInvestigateVendorInvestigate: Q1 98.14, median 98.99, Q3 99.55, n=11n=11NordanalytNordanalyt: Q1 99.18, median 99.33, Q3 99.79, n=10n=10KestrelKestrel: Q1 99.93, median 99.93, Q3 99.93, n=5outlier 99.59n=5 Purity (% area)
Figure. Melanotan II purity by contributing laboratory. Any offset between rows has two possible sources — a real difference in the material each laboratory happened to receive, and the laboratory's own bias — and this figure cannot separate them. The paired analysis that can is on inter-lab agreement.