Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 69, Issue 4, Pages 778-783Publisher
OXFORD UNIV PRESS
DOI: 10.1271/bbb.69.778
Keywords
indole-3-acetic acid; amino acid conjugate of IAA; Oryza sativa; solid-phase extraction
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A method for quantifying indole-3-acetic acid (IAA) and its conjugates with the six amino acids, Ala, -Asp, -Ile, -Glu, -Phe and -Val, in rice (Oryza sativa) by using high-performance liquid chromatography coupled with electrospray ionization and tandem mass spectrometry (HPLC-ESI-MS/MS) is described. Samples from the rice plant or callus were treated with 80% acetone in water containing 2.5mm diethyl dithiocarbamate. Each extract was partially purified in C-18 cartridge column for solid-phase extraction (SPE) and subjected to HPLC-ESI-MS/MS without converting the product. The detection limit was 3.8fmol for IAA, and 0.4-2.9 fmol for the IAA amino acid conjugates. The method was applied to the analysis of IAA and its conjugates in rice seedlings, dehulled rice and calli, using 20-100 mg tissue samples.
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