ISO 10727:1995
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
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Tea and instant tea in solid form Determination of caffeine content Method using high-performance liquid chromatography
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03-20-2019
French, English
01-19-1995
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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