Improved Procedure for Determining Free and Conjugated Indole-3-Acetic Acid by a Spectrofluorimetric Kinetic Method

Abstract The Indole-3-acetic acid (IAA), ester-and amide-linked IAA in peach seeds were determined by a kinetic method based on the measurement of the Indole-α-pyrone derivative of the free acid. The free acid concentration was 355 ng/g of fresh weight, the concentrations for the ester-and amide-conjugated IAA were 877 and 1785 ng/g of fresh weight, respectively. The relative standard deviation was always less than 15%.

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