Norm

ISO 4052:1983 en

Coffee - Determination of caffeine content (Reference method)

  • Deze norm is ingetrokken sinds 30-06-2016

31,57

Over deze norm

Status Ingetrokken
Aantal pagina's 6
Commissie Beleidscommissie Landbouw & Levensmiddelen
Gepubliceerd op 01-06-1983
Taal Engels
The method consists in extracting of the caffeine from a test portion, in an ammoniacal medium, successive purifying, with diethyl ether, on two chromatographic columns, the first in an alkaline medium, the second in an acid medium, followed by elution by chloroform. Spectrometric measurement of the eluate at the wavelength of maximum absorbance (in the ultraviolet region). A first figure shows examples of chromatographic columns. A second figure gives an example of spectrometric measurement.

Details

ICS-code 67.140.20
Nederlandse titel Coffee - Determination of caffeine content (Reference method)
Engelse titel Coffee - Determination of caffeine content (Reference method)

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