Journal of Agricultural and Food Chemistry p. 1052 - 1056 (1995)
Update date:2022-08-17
Topics:
Hoehl, Hans-Ulrich
Barz, Wolfgang
The metabolism of phoxim (Z-α-<<(diethoxyphosphinothioyl)oxy>imino>phenylacetonitrile), Volaton, was investigated using heterotrophic cell suspension cultures of soybean (Glycine max L.) and isolated organs (roots, stems, cotyledons, and leaves) of aseptically grown soybean plants.In both systems phoxim was first hydrolyzed to the corresponding oxime, which was then reduced to a primary nitrile amine.The primary amino group was N-malonylated as the terminal step of the catabolic sequence.The structure of this terminal metabolite was elucidated by spectroscopic (UV, IR, NMR, and MS) methods and chemical synthesis.In the plant no organ-specific differences in phoxim metabolism were observed.In the cell culture system phoxim was quantitatively converted to the N-malonate within 18-20 h, whereas in plant organs such extensive conversion could not be observed even within incubation times of about 5 days.The N-malonate was found to be excreted from the cultured cells into the medium; this effect could not be shown for the plant tissues.Keywords: Organothiophosphate metabolism; soybean plants and cell suspension cultures; conjugation reactions; N-malonylation; O-glucoside formation
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