ISO 4052:1983
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Coffee — Determination of caffeine content (Reference method)
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
02-04-2019
English, French
01-06-1983
Important note : Users cannot be edited or removed once added to your Multi user PDF.
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.
| DevelopmentNote |
Also numbered as BS 5752-3(1983) (08/2005)
|
| DocumentType |
Standard
|
| Pages |
6
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NFV 05 251 : 1983 | Identical |
| GOST ISO 4052 : 2013 | Identical |
| DIN 10777:1986-04 | Identical |
| PN ISO 4052 : 1998 | Identical |
| BIS IS 16039 : 2012 | Identical |
| DIN 10777:1986-04 | Corresponds |
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