Abstract
RECENTLY attention has been focused on the reaction of indole acetic acid with ferric ions. Cohen et al. 1 have shown that indole acetic acid forms a chelate with iron at acid pH and this has been confirmed by Recaldin and Heath2. The latter state that at pH 2.6 iron slowly decomposes the indole acetic acid in the solution. The oxidation of indole acetic acid by ferric salts is the basis of the colorimetric determination of the acid based on the Salkowsky reaction3–5. It is generally supposed that these reactions measure the formation of a coloured oxidation compound of indole acetic acid formed at very acid pH in the presence of ferric chloride.
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References
Cohen, D., Ginzburg, B. Z., and Heitner-Wirguin, C., Nature, 181, 686 (1958).
Recaldin, D. A., and Heath, O. V. S., Nature, 182, 539 (1958).
Mitchell, L. W., and Brunstetter, B. C., Bot. Gaz., 100, 802 (1939).
Tang, Y. W., and Bonner, J., Arch. Biochem., 13, 11 (1947).
Gordon, S. A., and Weber, R. P., Plant Phys., 26, 192 (1951).
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MAYER, A. Determination of Indole Acetic Acid by the Salkowsky Reaction. Nature 182, 1670–1671 (1958). https://doi.org/10.1038/1821670a0
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DOI: https://doi.org/10.1038/1821670a0
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