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Extraction of caffeine from tea


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I'm trying to conduct an experiment to extract caffeine from tea, using dichloromethane as the organic solvent to extract caffeine and sodium carbonate to separate out the other organic chemicals. The question here is, are there organic chemicals in tea (e.g.catechins, saponins) that would not be affected by the sodium carbonate and get mixed up with the caffeine in dichloromethane? If so, what else could I use?




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