Gradient elution and peptide peak separation
Read a chromatographic gradient programme, distinguish slope from duration and understand why the programmed composition does not instantly reach the column.
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HPLC peak integration and area percentage
Follow the calculation from recorded chromatographic signal to integrated peak area and area percentage, including the baseline and denominator.
Read the article →Co-eluting impurities in peptide chromatography
Understand how multiple components can contribute to one chromatographic peak and what different follow-up measurements can establish.
Read the article →Peak tailing and fronting in peptide analysis
Recognise asymmetric chromatographic peaks, read the stated shape metric and distinguish a visible shape problem from an established chemical cause.
Read the article →Chromatographic resolution and system suitability
Understand resolution as spacing relative to peak width, and read system-suitability checks against the analytical task they are intended to support.
Read the article →UV detection wavelengths in peptide HPLC
Understand why peptide chromatograms change with UV wavelength, why equal amounts can give unequal responses and what a weak channel does not establish.
Read the article →Mass-to-charge ratio in peptide spectra
Read the m/z axis, include the ion's charge and composition, and convert a protonated peptide signal into a neutral-mass estimate.
Read the article →Electrospray ionisation of peptides
Understand how electrospray connects a peptide solution with gas-phase ion measurements and why the resulting signal depends on the analytical conditions.
Read the article →Multiple charge states in peptide mass spectra
Recognise when several m/z signals can arise from one peptide, check their common neutral mass and distinguish charge-state spacing from isotope spacing.
Read the article →Deconvolution of peptide mass spectra
Understand how charged spectral signals become a reconstructed mass distribution, what assumptions enter the calculation and why the original spectrum still matters.
Read the article →Monoisotopic and average molecular mass
Choose the right mass convention before comparing a peptide reference with a spectrum, and understand why an isotope peak and an averaged value differ.
Read the article →Isotopic envelopes in peptide spectra
Read isotope-peak spacing and relative abundance without mistaking an isotope cluster for several different peptide sequences.
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