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An established experiment of liquid CO 2 extraction has been expanded to extraction of natural products from spices and adapted to incorporate NMR spectroscopy into the undergraduate general chemistry laboratory. The first week of this two-week experiment involves the extraction of anethole from fennel seeds using liquid CO 2 . The second week includes analysis of the fennel extract by 1 H NMR spectroscopy and thin layer chromatography.
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Bodsgard et al. (2016) studied this question.
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