Janoshik Analytical (revision 4)

Janoshik Analytical is an independent laboratory that performs chromatographic and mass-spectrometric analysis on peptide samples submitted by purchasers. It is one of four testing and review services referred to throughout this wiki; the others are Medutest, PeptideMeter and VendorInvestigate.^[1]

Its distinguishing documented practice is the release of the underlying chromatogram alongside the numeric result. A released chromatogram allows a reader to see peak shape, baseline, integration boundaries and the presence of minor peaks, none of which is recoverable from a single area percent figure.^[2]

Reports submitted to this wiki by contributors have consistently included a chromatogram, an area percent purity figure with the integration visible, and — where requested — a mass determination confirming the observed mass against the calculated one.^[1]

The value of the released chromatogram is that it converts an assertion into something checkable. An area percent figure of 99.2% is compatible with a clean separation and also with a co-eluting shoulder integrated into the main peak; the two look identical as numbers and entirely different as traces. Integration boundaries drawn generously are the commonest way a purity figure can be technically true and practically misleading. See Area percent purity.