A study was undertaken to determine the total residues including the sugar-and protein-bound residues of 2-naphthoxyacetic acid (BNOA), 2-(6-hydroxynaphthoxy)acetic acid (6-OH-BNOA), and 2-(7hydroxynaphthoxy)acetic acid (7-OH-BNOA) in tomato fruit, blossoms, and leaves from plants treated with BNOA. Analyses were by high-performance liquid chromatography. There were no detectable residues of 7-OH-BNOA at a method sensitivity of 0.05 ppm on any of the samples and <0.05 ppm of BNOA and 6-OH-BNOA on the tomato fruit. Tomato plant leaves had small amounts of BNOA and 6-OH-BNOA.Various chemicals of the plant growth regulating hormone types such as BNOA, 4-chlorophenoxyacetic acid, and 2,4-dichlorophenoxyacetic acid have been investigatedfor their effects on tomatoes (Mann and Minges, 1949; Wittwer and Reath, 1952). Emphasis in these studies was on tomatoes grown for early market production rather than on those grown for processing. Rathore et al. (1983) separated standard mixtures of organic acids including 2-naphthoxyacetic acid (BNOA) by paper chromatography. Thin-layer chromatography has
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