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The interaction of alkaloids with selected polyhaloquinone and polycyanoquinone π‐acceptors was found to yield intensely coloured radical ions. This finding was developed into a sensitive spectrophotometric assay for alkaloids of general applicability and with adequate accuracy and precision. 7,7,8,8‐Tetracyanoquinodimethane is used as the reagent.
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Taha et al. (1977) studied this question.
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