Esters of Indole-3-Acetic Acid from Avena Seeds 1
AUTOR(ES)
Percival, Frank W.
RESUMO
The present studies showed that about 80% of the indole-3-acetic acid extractable from Avena kernels by aqueous acetone was esterified to polymers precipitable by ammonium sulfate and ethanol or acetone. The polymers were positively charged, being adsorbed to cation exchange columns at a pH of 3, or below, and eluted at a pH greater than 4. The polymers were heterogeneous with respect to size, about 5,000 to 20,000 daltons, and charge, exhibiting apparent pKa values of 4.2 and 4.7. The polymer fractions contained esterified IAA, anthrone-reactive material that liberated glucose upon acid hydrolysis, phenolic compounds, and peptidic material with a high proportion of hydrophobic amino acids. Since the esterified IAA was unstable, establishing polymer purity was not possible, and the designation IAA-glucoprotein fraction was adopted.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=542180Documentos Relacionados
- Concentrations of Indole-3-acetic Acid and Its Esters in Avena and Zea12
- Uptake of Indole-3-acetic Acid and Indole-3-acetonitrile by Avena Coleoptile Sections 12
- Gas-Liquid Chromatographic Analysis of Indole-3-acetic Acid Myoinositol Esters in Maize Kernels 1
- Enzymatic Formation of Indole-3-Carboxaldehyde from Indole-3-Acetic Acid. 12
- Metabolism of Indole-3-Acetic Acid in Arabidopsis1
