Abstract
A HPLC assay for ABA and bound ABA is described. The method uses conventional acid-base ether extractions for partial cleanup of the plant extracts followed by Sephadex G-25 column fractionation. The ABA is separated and detected by HPLC on a 3 m × 2.1 mm i.d. column of SCX-Zipax with a uv detector. The method is sensitive to less than 10 ng of ABA. HPLC analyses of ABA have been performed on extracts of leaves, stems, and roots of soybeans, pinto beans, cotton, apple seedlings, and the albedo and flavedo sections of orange peels.
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