High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study
Four duplicate samples of cocoa-containing materials, a practice sample, and standards were submitted to the collaborators for theobromine and caffeine analysis by HPLC. In the method the samples are defatted with petroleum ether, and dried. The fat-free residue is them extracted with water and an aliquot is injected into the chromatograph. Compounds are quantitated by comparison with internal or external standards, either by peak height or peak area. Results for all the analyses showed that few of the values were more than 2 standard deviations from the mean. The method has been adopted as official first action.
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1980
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Subjects: | CHOCOLATE, CACAO, SUBPRODUCTOS, TEOBROMINA, CAFEINA, CROMATOGRAFIA LIQUIDA ALTA PRESION, ANALISIS QUIMICO, ALCALOIDES, |
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KOHA-OAI-BVE:694622020-02-03T21:36:34ZHigh pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study 83944 Kreiser, W.R. 90675 Martin Junior, R.A. 34095 93. Annual Meeting of the AOAC Washington, D.C. (EUA) 15-18 Oct 1979 1980Four duplicate samples of cocoa-containing materials, a practice sample, and standards were submitted to the collaborators for theobromine and caffeine analysis by HPLC. In the method the samples are defatted with petroleum ether, and dried. The fat-free residue is them extracted with water and an aliquot is injected into the chromatograph. Compounds are quantitated by comparison with internal or external standards, either by peak height or peak area. Results for all the analyses showed that few of the values were more than 2 standard deviations from the mean. The method has been adopted as official first action.Four duplicate samples of cocoa-containing materials, a practice sample, and standards were submitted to the collaborators for theobromine and caffeine analysis by HPLC. In the method the samples are defatted with petroleum ether, and dried. The fat-free residue is them extracted with water and an aliquot is injected into the chromatograph. Compounds are quantitated by comparison with internal or external standards, either by peak height or peak area. Results for all the analyses showed that few of the values were more than 2 standard deviations from the mean. The method has been adopted as official first action.CHOCOLATECACAOSUBPRODUCTOSTEOBROMINACAFEINACROMATOGRAFIA LIQUIDA ALTA PRESIONANALISIS QUIMICOALCALOIDESJournal of the Association of Official Analytical Chemists (EUA) |
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CHOCOLATE CACAO SUBPRODUCTOS TEOBROMINA CAFEINA CROMATOGRAFIA LIQUIDA ALTA PRESION ANALISIS QUIMICO ALCALOIDES CHOCOLATE CACAO SUBPRODUCTOS TEOBROMINA CAFEINA CROMATOGRAFIA LIQUIDA ALTA PRESION ANALISIS QUIMICO ALCALOIDES |
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CHOCOLATE CACAO SUBPRODUCTOS TEOBROMINA CAFEINA CROMATOGRAFIA LIQUIDA ALTA PRESION ANALISIS QUIMICO ALCALOIDES CHOCOLATE CACAO SUBPRODUCTOS TEOBROMINA CAFEINA CROMATOGRAFIA LIQUIDA ALTA PRESION ANALISIS QUIMICO ALCALOIDES 83944 Kreiser, W.R. 90675 Martin Junior, R.A. 34095 93. Annual Meeting of the AOAC Washington, D.C. (EUA) 15-18 Oct 1979 High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study |
description |
Four duplicate samples of cocoa-containing materials, a practice sample, and standards were submitted to the collaborators for theobromine and caffeine analysis by HPLC. In the method the samples are defatted with petroleum ether, and dried. The fat-free residue is them extracted with water and an aliquot is injected into the chromatograph. Compounds are quantitated by comparison with internal or external standards, either by peak height or peak area. Results for all the analyses showed that few of the values were more than 2 standard deviations from the mean. The method has been adopted as official first action. |
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CHOCOLATE CACAO SUBPRODUCTOS TEOBROMINA CAFEINA CROMATOGRAFIA LIQUIDA ALTA PRESION ANALISIS QUIMICO ALCALOIDES |
author |
83944 Kreiser, W.R. 90675 Martin Junior, R.A. 34095 93. Annual Meeting of the AOAC Washington, D.C. (EUA) 15-18 Oct 1979 |
author_facet |
83944 Kreiser, W.R. 90675 Martin Junior, R.A. 34095 93. Annual Meeting of the AOAC Washington, D.C. (EUA) 15-18 Oct 1979 |
author_sort |
83944 Kreiser, W.R. |
title |
High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study |
title_short |
High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study |
title_full |
High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study |
title_fullStr |
High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study |
title_full_unstemmed |
High pressure liquid chromatographic determination of Theobromine and caffeine in cocoa and chocolate products; collaborative study |
title_sort |
high pressure liquid chromatographic determination of theobromine and caffeine in cocoa and chocolate products; collaborative study |
publishDate |
1980 |
work_keys_str_mv |
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1756057250457190401 |