Tea and instant tea in solid form -- Determination of caffeine content -- Method using high-performance liquid chromatography
This standard has been revised by ISO 10727:2002
The method specified is based on extracting the caffeine from a test portion with water at 90 °C in the presence of magnesium oxide, filtration followed by determination of the caffeine content by HPLC with UV detection. Applies to teas and instant teas with a caffeine content of greater than 0,3 % (m/m).
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Revisions / Corrigenda