Results 81 to 90 of about 980 (152)

Diagnosing Parkinson’s disease and monitoring its progression: Biomarkers from combined GC-TOF MS and LC-MS/MS untargeted metabolomics

Heliyon
Parkinson's disease (PD) is a prevalent neurodegenerative disorder with a poorly understood etiology. An accurate diagnosis of idiopathic PD remains challenging as misdiagnosis is common in routine clinical practice.
Lina A. Dahabiyeh, Refat M. Nimer, Jeremiah D. Wells, Eman Y. Abu-rish, Oliver Fiehn   +4 more
doaj   +1 more source

A mild method for the preparation of 8-substituted xanthines from 5,6-diaminouracils

, 1999
The Schiff base derivatives (3), prepared from the respective 5,6-diaminouracil (1) and aldehydes can be mildly oxidatively cyclized with (m) under bar-CPBA in MeCN to afford C-8 substituted xanthines (6)
de Araujo, AD, Demnitz, FWJ, Bacher, E, Santos, DA   +3 more
core  

Solubilities of the xanthines caffeine, theophylline and theobromine in supercritical carbon dioxide

, 1994
Johannsen, M. and Brunner, G., 1994. Solubilities of the xanthines caffeine, theophylline and theobromine in supercritical carbon dioxide. Fluid Phase Equilibria, 95: 215-226.
Johannsen, Monika, Brunner, Gerd
core   +1 more source

Structure-activity relationships in a series of 8-substituted xanthines as A(1)-adenosine receptor antagonists

, 2001
A series of X-substituted xanthines were synthesized and their affinity in vitro towards A(1), A(2A)-adenosine receptors was evaluated by radioligand receptor binding assays.
Strappaghetti G, Corsano S, GIANNACCINI, GINO, Barbaro R, BETTI, LAURA   +4 more
core   +1 more source

Edible films as oral delivery systems for xanthines extracted from medicinal plants: an experimental design approach [PDF]

, 2016
Two formulations of edible films intended for oral delivery of therapeutic xanthines were developed, following an experimental design approach. Gelatin type A and sodium carboxymethylcellulose were used as polymeric matrices with different physico ...
Castro, Pedro M., Oliveira, Ana, Fonte, Pedro, Madureira, Ana Raquel, Sarmento, Bruno, Pintado, Manuela   +5 more
core  

Sympathomimetic Action of Xanthine Diuretics in the Alligator

, 1956
The injection of caffeine, theobromine, theophylline and Mictine in doses of 25–250 mg/kg produced effects almost indistinguishable from those of epinephrine in doses of 1 mg/kg. The diuretic effects and the pattern of electrolyte excretion in the urine
Roland A. Coulson, Thomas Hernandez
core   +1 more source

XANTHINE OXIDASE

Journal of Biological Chemistry, 1957
Irwin Fridovich, Philip Handler
openaire   +1 more source

Concise xanthine synthesis through a double-amidination reaction of a 6-chlorouracil with amidines using base-metal catalysis

, 2017
: A new and concise route towards xanthines through a double-amidination reaction is described; consecutive intermolecular C 12Cl and intramolecular oxidative C 12H amidination.
Moseley, Jonathan D., Franck, Philippe, Sergeyev, Sergey, Morel, B\ue9n\ue9dicte, Smith, Dan A., Bidange, Johan, Maes, Bert U.W.   +6 more
core   +1 more source

Métodos para análise de ácido clorogênico

Química Nova, 2004
This paper describes the analytical methods for determination of total chlorogenic acid (CGA) and their individual isomers. Spectrofotometric methods are adequate for total CGA analysis in green coffee but they can provide inflated results for coffee ...
De Maria Carlos Alberto Bastos, Moreira Ricardo Felipe Alves   +1 more
doaj  

Environmental Fate of Emerging Contaminants and Their Transformation Products in Mexican Aquatic Systems: Distribution, Persistence, Monitoring Gaps, and Removal

Molecules
Emerging contaminants (ECs) represent a growing environmental problem due to their presence in various environmental matrices. In Mexico, research on ECs remains limited.
Sheila Genoveva Pérez Bravo, Ana Carolina Anzures Mendoza, Ana Lilia Avilés Mariño, Rosa Elena Zamudio Alemán, Dalia Guadalupe Mendoza López, María del Refugio Castañeda Chávez   +5 more
doaj   +1 more source