Abstract
HPLC and NMR methods are described for determining the levels of the sesquiterpene dialdehydes polygodial and 9-deoxymuzigadial in the foliage of Pseudowintera colorata. Analyses of 25 individual plants, from four populations on the South Island of New Zealand, showed two chemotypes: a mixed chemotype with similar levels of polygodial and 9-deoxymuzigadial, and a polygodial chemotype with very low levels of 9-deoxymuzigadial. Only the polygodial chemotype was found in northern and southwestern populations, both chemotypes were found in a central eastern population, and only the mixed chemotype was found in a southeastern population.
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