| 11. | Hibiscus tea contains 15-30 % organic acids, including citric acid, malic acid, and tartaric acid.
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| 12. | Most species of portulaca have mucilaginous, often acidic ( malic acid ) stems and foliage.
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| 13. | Tartaric acid is most often added, but winemakers will sometimes add citric or malic acid.
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| 14. | To achieve this they synthesize malic acid in the leaves from neutral precursors like carbohydrates.
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| 15. | For example, lactose, malic acid and testosterone which are formed only by carbon, hydrogen and oxygen.
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| 16. | Most commercial malic acid additives are a mixture of the enantiomers D + and L-malic acid.
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| 17. | Malic acid has two stereoisomeric forms ( L-and D-enantiomers ), though only the L-isomer exists naturally.
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| 18. | Most commercial malic acid additives are a mixture of the enantiomers D + and L-malic acid.
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| 19. | As an example, malic acid has 4 carbon atoms but just one of them is asymmetric.
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| 20. | Malic acid occurs naturally in all fruits and many vegetables, and is generated in fruit metabolism.
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