High‐performance liquid chromatography in combination with mass spectrometric detection (atmospheric‐pressure chemical ionization, APCI) was used to determine various isoflavones. Negative‐ion APCI ionization has proved to be a suitable technique for determining this class of natural compound, as it provides quality mass spectra which give not only the molecular weight of the isoflavones, but also their molecular structures; consistent collision‐induced dissociation pathways were elucidated and fragments are reported. Deuterium oxide was used to induce peak shifts in the mass spectra in order to determine the number of exchangeable hydrogen atoms in each molecule.
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Aramendı́a et al. (1995) studied this question.
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