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Detection of trace amounts of methylated uric acids in crude caffeine from different sources

by Citroreksoko, P.S; Petermann, J; Wanner, H; Baumann, T.W; Association Scientifique Internationale du Café, Paris (Francia); 8. Colloque Scientifique International sur le Café Abidjan (Costa de Marfil) 28 Nov-3 Dic 1977.
Publisher: Paris (Francia) 1979Description: p. 143-145.Subject(s): COFFEA EXCELSA | BIOQUIMICA | ANALISIS QUIMICO | CAFEINA | ACIDOS | ACIDO URICO | COFFEA EXCELSA | BIOCHEMISTRY | CAFFEINE | ACIDS | URIC ACID | COFFEA EXCELSA | BIOCHIMIE | CAFEINE | ACIDE | ACIDE URIQUESummary: In TLC analyses of crude caffeine from ripe Coffea excelsa beans the authors found traces of highly methylated uric acids. In order to quantify and identify these compounds they have chromatographed larger samples on a cation exchange column. By this method it is possible to separate a few micrograms of methyluric acids from about 20 mg caffeine. So far they have examined caffeine preparations from tea leaves and from coffee beans of different species for their content of such accompanying substances
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++ Dat. num. 8 ref. Sum. (En, Fr)

In TLC analyses of crude caffeine from ripe Coffea excelsa beans the authors found traces of highly methylated uric acids. In order to quantify and identify these compounds they have chromatographed larger samples on a cation exchange column. By this method it is possible to separate a few micrograms of methyluric acids from about 20 mg caffeine. So far they have examined caffeine preparations from tea leaves and from coffee beans of different species for their content of such accompanying substances

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