||Interactions between furanocoumarins
metabolism of webworms is increased when furanocoumarins are incorporated into its
diet. Metabolism rates of specific furanocoumarins vary. In general the
linear furanocoumarins (e.g., bergapten and xanthotoxin) are metabolized rapidly, while
the angular furanocoumarins (e.g., sphondin) are metabolized more slowly. When
furanocoumarins are present in mixtures, as they would be in the host plant,
metabolism rates are dramatically reduced, suggesting competitive inhibition among these
substrates (see graph at right).