Cross-section

N-Acetyl Semax Amide 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 N-Acetyl Semax Amide, with a class minimum gradient of 15 min, the method is a live explanation.

89 recordsmedian 99.26 %spec 98.5 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	36	30min	High	99.13	+0.00	99.13	ADEQUATE
PeptideMeter	18	28min	High	99.11	-0.05	99.16	ADEQUATE
Medutest	17	25min	Unit	99.78	+0.08	99.70	ADEQUATE
VendorInvestigate	9	32min	High	98.61	-0.11	98.72	ADEQUATE
Nordanalyt	5 n=5	35min	High	99.50	+0.02	99.48	ADEQUATE
Kestrel	4 n=4	15min	Unit	99.50	+0.24	99.26	ADEQUATE

Figure. N-Acetyl Semax Amide 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.