Jerusalem artichoke tubers (Helianthus tuberosus L.) undergo enzymatic browning when peeled or cut,
and turn grey after boiling, due to after-cooking darkening reactions between iron and phenolic acids.
In an attempt to reveal the components responsible for these discolouration reactions, sensory evaluation
and instrumental colour measurements were related to contents of total phenolics, phenolic acids,
organic acids and iron in three varieties of raw and boiled Jerusalem artichoke tubers harvested in the
autumn and the spring.