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Concentration of TMA extracted from red cabbage with pure solvents and binary liquid mixtures, free of organic acids and with organic acids: (filled blue circle) (1) water; (filled orange circle) (2) methanol; (filled grey circle) (3) ethanol; (filled yellow cicle) (4) isopropanol; (filled red circle) (5) water + methanol; (filled green circle) (6) water + ethanol; (filled pink circle) (7) water + isopropanol; standard relative deviation 0.08 (color figure online)
