Journal ArticleDOI
A rapid micro-method for the separation, identification and estimation of the purine bases: caffeine, theobromine and theophylline.
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TLDR
A sensitive method for the quantitative detection of the purine bases caffeine, theobromine and theophylline is described, based on thin layer chromatography and has the added advantage that it does not require any expensive apparatus.About:
This article is published in Journal of Chromatography A.The article was published on 1968-01-01. It has received 15 citations till now. The article focuses on the topics: Theobromine & Theophylline.read more
Citations
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Journal ArticleDOI
Theobromine and caffeine content of the cocoa bean during its growth
TL;DR: In this paper, the authors determined changes in the concentrations of caffeine and theobromine in the cocoa pod during its growth, and found that the concentrations increased significantly after about 12 weeks from flowering to the time of harvesting.
Journal ArticleDOI
TLC techniques for identification of narcotics, barbiturates, and CNS stimulants in a drug abuse urine screening program.
K.K. Kaistha,Jerome H. Jaffe +1 more
TL;DR: Chromatographic developing solvent systems are described that can differentiate drugs of abuse and their adulterants from drugs used in treatment and methadone and/or cocaine from methapyrilene, diphenhydramine, pentazocines, cyclazocine, pipradrol, propoxyphene, thioridazine, promazine, and chlorpromazine.
Journal ArticleDOI
Extraction techniques for narcotics, barbiturates, and central nervous system stimulants in a drug abuse urine screening program
K.K. Kaistha,Jerome H. Jaffe +1 more
TL;DR: Several different extraction techniques, each of which is well suited to large scale screening of urines for drugs of abuse, are presented, and some of the relative advantages and disadvantages of each procedure are presented.
CAFFEINE, THEOBROMINE AND THEOPHYLLINE DISTRIBUTION IN Ilex paraguaryensis
TL;DR: In the mate plant (Ilex paraguaryensis Lamb), the levels of theobromine and theophylline were found to be higher in younger tissues.
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Estimation of caffeine, theophylline and theobromine in plant material
M. A. F. Jalal,H. A. Collin +1 more
TL;DR: In this paper, a method for the combined estimation of caffeine, theophylline and theobromine in plant material is presented, which involved a chloroform-ammonia extraction, separation of the bases in the chloromethane extract by thin layer or paper chromatography and finally estimation of the eluted bases by spectrophotometry.
References
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Journal ArticleDOI
Quantitative analysis by thin-film chromatography
S. Jean Purdy,E. V. Truter +1 more
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A reagent for the detection of chloride and of certain purines and pyrimidines on paper chromatograms.
TL;DR: A silver nitrate reagent has been developed which will detect as little as 1 µgm.
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Séparation de la solanine, de la chaconine et de la solanidine par chromatographie sur couches minces
TL;DR: In this article, a methode rapide de separation par chromatographie sur couches minces de la solanine, de la chaconine, and of the solanidine, is decrite dans le present article.
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Über die Bestimmung von Purinen in coffeinhaltigen Drogen
H. Michl,F. Haberler +1 more
TL;DR: In this article, an sechs coffeinhaltigen Drogen eine qualitative and quantitative Purinanalyse durchgefuhrt, wobei versucht wird, die Purine bis zu einem Gehalt von 10−3% zu erfassen.