High-performance liquid chromatography of plant hormones

Involvement of naphthalene dioxygenase in indole-3-acetic acid biosynthesis by Pseudomonas putida

Two variants of plant growth-promoting strain Pseudomonas putida BS1380 harboring the naphthalene degradative plasmid pBS2 and the recombinant plasmid pNAU64 that contains the genes encoding for naphthalene dioxygenase were constructed by conjugation. The ability of this strain to produce phytohormone indole-3-acetic acid from different carbon sources was studied. Indole-3-acetic acid synthesis by these transconjugants was 15-30 times as much in contrast to a wild-type strain with glucose as the sole carbon source. No difference was observed in other carbon or nitrogen sources. It is suggested that naphthalene dioxygenase is involved in the conversion of indole-3-pyruvic acid to indole-3-acetic acid.

High-performance liquid chromatographic profiling of indolylacryloylglycine and its possible precursors in body fluids

Indolylacryloylglycine (IAcrGly) is one of the physiological components of urine, although its source and its role in the human organism have not yet been unambiguously established. Changes in the IAcrGly excretion level have been found under some physiological (age dependence, seasonal variations) and pathological (photodermatoses, muscle dystrophy, liver cirrhosis) conditions. The proposed method for IAcrGly, indolylacrylic acid and its possible precursors, namely indolyllactic and indolylpropionic acids, involves deproteinization and extraction of urine on a Sep Pak C18 cartridge. HPLC analysis was carried out using a DataApex liquid chromatograph, equipped with an LCD 2082 UV detector, signals being acquired with a CSW workstation. The chromatographic column was Spherisorb ODS, 5 microns (125 x 4 mm I.D.), the mobile phase for isocratic elution was ethanol-1% acetic acid (27:73) and the flow-rate was 0.7 ml/min. The lower response limit is about 1 mumol/l for all metabolites at 280 nm.