Results 131 to 140 of about 950 (173)
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Physiological and clinical chemistry of biopterin
Medicinal Research Reviews, 1989Chimie, dosage de la biopterine. Biosynthese de la tetrahydrobiopterine. Role physiologique de la tetrahydrobiopterine comme cofacteur des monooxygenases necessitant la pterine.
T, Nagatsu, S, Matsuura, T, Sugimoto
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Biopterin and neopterin in human saliva
Life Sciences, 1989Presence of biopterin and neopterin in human saliva was investigated by HPLC after iodine oxidation in acidic medium. Concentrations of biopterin and neopterin (M +/- SEM) were 1.271 +/- 0.254 and 0.358 +/- 0.075 ng per ml, respectively, in saliva of apparently healthy young male adults, ages 20 to 22 years (n = 9).
S, Katoh +3 more
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Psychiatric Manifestations in Patients with Biopterin Defects
Neuropediatrics, 2022AbstractPsychiatric manifestations in patients with tetrahydrobiopterin (BH4) defects are common, and may occur even with treatment of the underlying disorder. The neurobiological background of these conditions has been linked to abnormalities of neurotransmitters, such as dopamine, serotonin, norepinephrine, and gamma-aminobutyric acid.
Maksim Parfyonov +4 more
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Neurochemical Research, 1981
Repeated intraventricular injections of 2,4-diamino-6-hydroxypyrimidine (DAO-Pyr), inhibitor of D-erythro-q-dihydroneopterin triphosphate synthetase, inhibited q-BH2 synthesis from GTP, markedly increased accumulation of 2-amino-4-hydroxy-5 (or -6)-formamido-6-triphosphoribosylaminopyrimidine (FPyd-P3) and brought about a 60% decrease in the in vivo of
E M, Gál, D H, Whitacre
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Repeated intraventricular injections of 2,4-diamino-6-hydroxypyrimidine (DAO-Pyr), inhibitor of D-erythro-q-dihydroneopterin triphosphate synthetase, inhibited q-BH2 synthesis from GTP, markedly increased accumulation of 2-amino-4-hydroxy-5 (or -6)-formamido-6-triphosphoribosylaminopyrimidine (FPyd-P3) and brought about a 60% decrease in the in vivo of
E M, Gál, D H, Whitacre
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Screening for Biopterin Disorders in PKU
Pediatrics, 1980It is now recognized (Pediatrics 65:806, 1980) that a small proportion of cases of phenylketonuria (PKU) may be due to abnormalities in the metabolism of biopterin. These cases do not respond to the restriction of dietary phenylalanine, but may be benefited by neurotransmitter replacement therapy. A specific diagnosis is therefore desirable.
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, 1990 ChemInform Abstract: PTERIDINES, LXXV. SYNTHESIS AND PROPERTIES OF BIOPTERIN AND BIOPTERIN ANALOGS
Chemischer Informationsdienst, 1985AbstractAus dem Desoxy‐arabinose‐hydrazon (II) und den Diaminen ( l) werden Biopterin ( 111a), dessen Dimethyl‐Derivat (IIIc) und Biolumazin (IIIb) hergestellt.
M. KAPPEL, R. MENGEL, W. PFLEIDERER
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Journal of the Chemical Society C: Organic, 1969
An unambiguous synthesis of biopterin [2-amino-6-(L-erythro-1,2-dihydroxypropyl)pteridin-4-(3H)-one] is described; based on an improved synthesis of L-neopterin. The synthesis yields biopterin, a naturally occurring pteridine, in a pure, crystalline form without recourse to chromatography. D-Biopterin and D-neopterin are also described.
K. J. M. Andrews +2 more
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An unambiguous synthesis of biopterin [2-amino-6-(L-erythro-1,2-dihydroxypropyl)pteridin-4-(3H)-one] is described; based on an improved synthesis of L-neopterin. The synthesis yields biopterin, a naturally occurring pteridine, in a pure, crystalline form without recourse to chromatography. D-Biopterin and D-neopterin are also described.
K. J. M. Andrews +2 more
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Quantitation of total biopterin and tetrahydrobiopterin in plasma
Clinical Biochemistry, 2007To develop a reliable method for the determination of tetrahydrobiopterin and total biopterin in plasma.Modifications include blood collection and handling procedures.Collection of blood in the presence of 0.1% (w/v) dithiothreitol and waiting for 2-3 h before centrifugation are optimal for adequate quantitation of both pterins.For a reliable ...
Fekkes, Durk, Kooijman, Ans
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Biopterin metabolism in patients with malignant syndrome
Parkinsonism & Related Disorders, 2003We examined the autopsied brains of two parkinsonian patients who had malignant syndrome (MS). Neopterin and biopterin contents, and GTP cyclohydrolase I activity were measured in various region of the brain. We found relatively higher GTP cyclohydrolase I activities in the hypothalamus compared with other regions of the brain from patients with MS ...
H. Ichinose +7 more
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