β-O-Glucoside and β-O-glucuronide conjugates
of
1-hydroxypyrene (OHPy) were found in the leaves of
four kinds of woody plant; cherry, maple, ginkgo,
and camphor. The conjugates were quantified by
measuring OHPy liberated from the water-soluble
fraction of leaves treated with β-O-glucosidase
and
β-O-glucuronidase. Concentrations of
β-O-glucuronide
and β-O-glucoside ranged from 0 to 358 and
from
0 to 129 pmol/g of fresh leaves, respectively, in monthly
measurement over a period of 1 year. The amounts
of glucuronide conjugates were greater than those
of glucoside conjugates in most plants examined.
Both conjugates were detected at the highest concentrations in summer to autumn. For most plants, the
total amounts of the conjugates were greater than
that of free OHPy in the leaves in all seasons, and the
differences reached 30-fold in maple leaves in
September. From these results, the source of the OHPy
conjugates in leaves and their implications are
discussed.
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