Whiteness and browning
showed no relations to the measured chemical constituents.
Apparently, the concentrations of phenolic acids and iron are not
related to the degree of after-cooking darkening of boiled Jerusalem
artichoke tubers. The varieties Rema and Draga, were more closely
associated with sensory evaluated browning than Mari, which was
also expected from Mari’s lower scores in the sensory attribute (Table
1). The L⁄-variable was placed close to citric acid and phenolic
acids in the plot. A positive significant correlation between L⁄-values
and contents of citric acid was observed (r = 0.71, p = 0.001),
revealing that boiled tubers with high contents of citric acid were
whiter than those with low contents.