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Leaf tissue (20 mg) was ground with a mortar and a pestle
in liquid N, and homogenized in 1.5 mL Na-phosphate buffer
(0.05 M, pH 7.0) containing 0.02% (w/v) sodium diethyldithiocarbamate
as an antioxidant. An internal standard of
13C6¨CIAA (200 ng) was added into each sample and extracted
by continuous shaking for 1 h at 4¡ãC. The samples were
transferred into 1.5-mL microcentrifuge tubes after extraction
and pH was adjusted to approximately 2.6 with 1.0 M
HCl (about 43 ¦ÌL of HCl was required for 1 mL of extract).
The sample was slurried with 60 mg of Amberlite XAD-7
(Sigma, MO) for 30 min. After removal of the buff er, the
XAD-7 was washed with 2 ¡Á 500 ¦ÌL of 1% acetic acid before
being slurried with 2 ¡Á 500 ¦ÌL of dichloromethane for 2 ¡Á
30 min (Edlund et al., 1995). The combined dichloromethane
fractions were reduced to dryness with nitrogen gas. Samples
were methylated with ethereal diazomethane at room temperature
according to Prinsen et al. (2000).
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