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.

88 recordsmedian 99.35 %spec 98.5 %

Laboratory	Reports	Gradient	MS resolution	Median purity %	Published bias (pp)	Bias-adjusted	Method suitability
Janoshik	41	30min	High	99.40	+0.00	99.40	ADEQUATE
PeptideMeter	14	28min	High	99.23	-0.05	99.28	ADEQUATE
Medutest	12	25min	Unit	99.63	+0.08	99.55	ADEQUATE
VendorInvestigate	9	32min	High	98.93	-0.11	99.04	ADEQUATE
Kestrel	7 n=7	15min	Unit	99.36	+0.24	99.12	ADEQUATE
Nordanalyt	5 n=5	35min	High	99.13	+0.02	99.11	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.