Synthesis of Coffinite—USiO ₄

The destruction of indoleacetic acid. III. Relationships between peroxidase action and indoleacetic acid oxidation

“…This may be thought surprising, in view of the small amount of IAA which is present, the excess of H202 , and the considerable inhibition of pyrogallol peroxidation suggestive of an interaction of IAA with the enzyme. Since calorimetric determination of IAA in the presence of the amounts of polyphenol and Hz02 used in such experiments is very unreliable (15), two physical methods were employed to ascertain how much IAA destruction was actually occurring in the presence of pyrogallol and excess Hz02 .…”

An Improvement in the Sensitivity of the Salkowski Reagent for Tryptamine, Tryptophan and Indoleacetic Acid

“…The danger of encountering oxidizing or reducing substances in extracts which are known to interfere with tbe production of color with the Salkowski reagent (Gordon and Weber 1951, Platt and Thimann 1956. Siegel and Wciiitranh 1952 mnst he considered carefnily.…”

Indole Auxins

“…carried out with the unknown auxin still on the chromatogram are not so sensitive as the oat, wheat, and pea bioassays with the segmented chromato gram, and possible sources of error in the interpretation of the results also demand extra caution (27). Some indole compounds give a negative or only a slight chromogenic reaction (91), and certain phenols and polyphenols can interfere with the assessment of IAA by the Salkowski test (153). Also, a number of naturally occurring substances, not indole compounds, are re ported to give similar chromogenic reactions on chromatograms.…”