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RATIONALECompound‐specific isotope analysis (CSIA) of the extracted caffeine can be used to determine the authenticity of the origin of tea. Elemental analysis‐isotope ratio mass spectrometry (EA‐IRMS), which is widely used to measure the carbon isotope ratio of caffeine, has a strict requirement for the purity of the extracted caffeine. To obtain high‐purity caffeine from tea leaves, the conventional...
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