Highlights
•Discolouration of Jerusalem artichokes was measured by instrumental colour analysis.
•Sensory analysis of colour attributes of raw and boiled tubers was performed.
•Contents of total phenolics, phenolic acids, iron and organic acids were analysed.
•Enzymatic browning was the same independent of variety and harvest time.
•Analysed constituents could not explain discolourations of raw and boiled tubers.