A Modified Microbiological Method for Determination of Folate Levels in Erythrocyte and Plasma
Pteridines, 2007 Pteridines are natural heterocyclic compounds and they are generally divided into two main groups which are denominated as conjugated and unconjugated pteridines.
Sipahi Hande +3 more
doaj +1 more source
Prediction of Fragmentation Pathway of Natural Products, Antibiotics, and Pesticides by ChemFrag
Journal of Mass Spectrometry, Volume 60, Issue 5, May 2025.ABSTRACT Because the manual interpretation of ESI‐MSn fragmentation spectra is time‐consuming and usually requires expert knowledge, automated annotation is often sought. The fragmentation software ChemFrag enables the annotation of MSn spectra by combining a rule‐based fragmentation and a semiempirical quantum chemical approach.
Jördis‐Ann Schüler +4 more
wiley +1 more source
First Synthesis of a Representative, Natural Pterin Glycoside: 2’-O-(α-D-Glucopyranosyl)biopterin [PDF]
, 2009 Glycosylation of N(2)-(N,N-dimethylaminomethylene)-1’-O-(4-methoxybenzyl)-3-[2-(4-nitrophenyl) ethyl]biopterin (14) with the novel donor 4,6-di-O-acetyl-2,3-di-O-(4-methoxybenzyl)-α-D-glucopyranosyl bromide (19) in the presence of silver triflate and ...
Hanaya, Tadashi +2 more
core
Tetrahydrobiopterin analogues with NO-dependent pulmonary vasodilator properties [PDF]
, 2011 Reduced NO levels due to the deficiency of tetrahydrobiopterin (BH4) contribute to impaired vasodilation in pulmonary hypertension Due to the chemically unstable nature of BH4 it was hypothesised that oxidatively stable analogues of BR, would be able to ...
Gibson, Colin +4 more
core +1 more source
Neopterin-induced Suppression of Erythropoietin Production In Vitro
Pteridines, 1995 The production of neopterin increases in several diseases with activation of the ceIlular immune response. As previously shown serum concentrations of neopterin are inversely correlated with blood hemoglobin concentrations in the anemia of hematological ...
Schobersberger W. +5 more
doaj +1 more source
Photo-reduction of Pteridines [PDF]
Nature, 1956 WHEN a solution of 7-hydroxypteridine1 was spotted on a sheet of Whatman No. 1 filter paper, irradiated with ultra-violet light (principally 254 mµ) for 5 min., and developed (by ascending chromatography) in various solvents, two spots appeared. One of these was identical with the starting material (unirradiated material was used as a control on the ...
openaire +2 more sources
Urinary and Serum Pteridines in Liver Diseases
Pteridines, 1996 The aim of this mini-review is to show the usefulness of pteridines as clinical markers. We assayed urinary neopterin and xanthopterin levels in liver disease. Total pterins were oxidized by active carbon to yield xanthopterin.
Mazda Toshio +2 more
doaj +1 more source
Folate, neopterin and kynurenine pathway in patients with statin therapy
Pteridines, 2016 Statins, widely used antihyperlipidemic drugs, also have immunomodulatory properties independent from their lipid lowering effect. Even with slight modulations in the immune system, pteridine levels can display changes.
Palabiyik Saziye Sezin +9 more
doaj +1 more source
Optimized Analytical Procedures for the Untargeted Metabolomic Profiling of Human Urine and Plasma by Combining Hydrophilic Interaction (HILIC) and Reverse-Phase Liquid Chromatography (RPLC)-Mass Spectrometry. [PDF]
, 2015 Profiling of body fluids is crucial for monitoring and discovering metabolic markers of health and disease and for providing insights into human physiology.
Contrepois, Kévin +2 more
core +1 more source
Characterization of Underivatized Pterins by Laser Desorption Fourier Transfonn Mass Spectrometry
Pteridines, 1993 Laser desorption FfMS provides a powerful method for examining the structures of underivatized pteridines. (M + Na)+ and (M + K)+ ions are generated by laser desorption and can be used to determine molecular weights. The negative ion spectra provide more
Jacobson K. Bruce, Hettich Robert L.
doaj +1 more source