isethionic acid

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i·se·thi·on·ic ac·id

(ī'sĕ-thī-on'ik as'id),
A colorless viscous liquid, miscible with water and alcohols, that forms crystalline salts with organic acids.
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Peak 1 displayed the pattern of isethionic acid (Barrow et al., 1993), as determined by [.sup.1]H- and [.sup.13]C-NMR spectroscopy, as well as some additional signals that were not characteristic of floridoside (see next section).
Isethionic acid and taurine were the major compounds in peak 1, as determined by [.sup.1]H- and [.sup.13]C-NMR spectroscopy and comparison with synthetic samples.
[.sup.13]C-NMR spectroscopy analysis of this peak showed only [.sup.13]C-signals for floridoside and isethionic acid (Williamson et al., 2000).
No metamorphosis was observed in treatments containing floridoside or isethionic acid, or in the controls.
Through bioassay-guided fractionation, the cue for metamorphosis was demonstrated to be a noncovalently-bound complex of the sugar floridoside and isethionic acid. The unusual (complexed) nature of the cue was confirmed by NMR spectroscopy, and by showing that the two components separately had no effect on metamorphosis.