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Digitale Medien

Effect of age on homovanillic and 4-hydroxy-3-methoxymandelic acid levels in plasma (1986)

Hunneman, D. H. ; Jonas, W. ; Gabriel, M. ; [weitere]

Springer

European journal of pediatrics 145 (1986), S. 555-557

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ISSN: 1432-1076

Schlagwort(e): Homovanillic acid ; 4-hydroxy-3-methoxymandelic acid ; Catecholamine acidic metabolites ; Plasma ; Mass fragmentography

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract The plasma levels of homovanillic and 4-hydroxy-3-methoxymandelic acids have been determined in 524 normal subjects ranging from birth to 49 years of age using a mass fragmentographic method. The mean concentration of homovanillic acid in plasma declines exponentially from the age of 1 day (x=2342.0 nmol/l, 426.6 ng/ml) to adulthood (x=60 nmol/l, 10.9 ng/ml). 4-Hydroxy-3-methoxymandelic acid behaves in a similar although not so extreme manner (392 nmol/l, 77.6 ng/ml–50 nmol/l, 10 ng/ml).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02429064

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Digitale Medien

Neonatal pyruvate dehydrogenase deficiency with lipoate responsive lactic acidaemia and hyperammonaemia (1989)

Byrd, D. J. ; Krohn, H. -P. ; Winkler, L. ; [weitere]

Springer

European journal of pediatrics 148 (1989), S. 543-547

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ISSN: 1432-1076

Schlagwort(e): Pyruvate dehydrogenase deficiency ; Hyperammonaemia ; Peritoneal dialysis ; Lipoic acid ; Plasma amino acids

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract A 2-day-old girl developed a severe lactic acidosis with a normal lactate/pyruvate ratio and hyperammonaemia. Plasma arginine and citrulline levels were below the limit of detection. In muscle total pyruvate dehydrogenase complex (PDHC) and pyruvate decarboxylase (E1) activities were reduced to a fraction of lower control values. The acute neonatal period was bridged with peritoneal dialysis, dichloroacetate therapy, supplements of arginine and branched chain amino acids, a complete vitamin B complex and lipoic acid. Lactate homeostasis responded to pharmacological supplements of lipoic acid. At age 1 year the child was hypotonic, showed severe developmental retardation, optic atrophy and cranial dysmorphism. She died aged 1 year 8 months with signs of respiratory paralysis but with normal lactate levels under assisted breathing. Pathological findings at autopsy were suggestive of Leigh syndrome, interstitial pneumonia and extensive fatty infiltration of hepatocytes. Regression analysis of data from 187 plasma amino acid determinations from the patient over a period of 1 year 8 months revealed a persistent imbalance involving alanine, glutamic acid, glutamine, proline, citrulline and branched chain amino acids. Aspects of acute and long-term therapy in this patient and some implications of the imbalances in plasma amino acids are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00441554

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Digitale Medien

Studies on the mass fragmentographic determination of plasma estriol (1974)

Adlercreutz, H. ; Nylander, P. ; Hunneman, D. H.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 1 (1974), S. 332-339

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ISSN: 1052-9306

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Three mass fragmentatographic methods for the determination of unconjugated estriol in pregnancy plasma and unconjugated and conjugated estriol in plasma of nonpregnant women after estriol administration were developed and tested as to their reliability and practicability. The methods were found to fulfil appropriate reliability criteria especially with regard to specificity. Unconjugated estriol could be assayed without prior chromatography in late pregnancy plasma, but a chromatographic step was needed for plasmas with a low estriol titre, and both a methylation step and chromatography is needed to achieve the required specificity if plasma conjugated estriol is determined or if assays are carried out following estriol administration. Unconjugated estriol in normal late pregnancy plasma was found in concentrations from 4.3 to 9.3 μg/l. The highest value recorded, 16.3 μg/l, was found in a prediabetic subject with mild hypertension, who delivered a child weighing 4150 g by Cesarean section in the 39th week. Low values were found in severe hypertension and in toxemia, and in general the results from the pathological material investigated seemed to correlate well with the clinical findings. However, only a few samples (five to ten) can be processed so rapidly that the results can be obtained the same day, which in addition to the expensive and complicated instrumentation limits the usefulness of the methods in routine clinical chemistry.

Zusätzliches Material: 6 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bms.1200010508

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Digitale Medien

Migration of dimethylsilyl substituents upon electron-impact: The fragmentation of methyl 12-dimethylsilyloxyoctadecanoate (1972)

Hunneman, D. H. ; Richter, W. J.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 6 (1972), S. 909-916

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Fragmentation of the dimethylsilyl (DMS) derivative of methyl 12-hydroxyoctadecanoate is found to be closely analogous to that of the previously studied trimethylsilyl (TMS) derivative, including migration of the silyl substituent from C-12 to the ester carboxyl function. besides establishing comparable migratory aptitudes of the TMS and DMS substituents, details of several other processes were revealed by use of deuterium labelling of selected positions and compared with related fragmentation of simple long-chain alcanoic esters.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210060811

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Digitale Medien

Gas chromatographic - mass spectrometric studies of long chain hydroxy acids. - III.1 The mass spectra of the methyl esters trimethylsilyl ethers of aliphatic hydroxy acids. A facile method of double bond location (1968)

Eglinton, G. ; Hunneman, D. H. ; McCormick, A.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 1 (1968), S. 593-611

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Trimethylsilylation has proved to be extremely useful in the gas chromatography and the mass spectrometry of hydroxy acid methyl esters. The characteristic mass spectral fragmentation patterns have shown these derivatives to be superior in some respects to others for structural elucidation; in particular, hydroxylation followed by trimethylsilylation provides a useful method of double bond location in unsaturated fatty acid esters.A preliminary presentation of this method has been given by G. Eglinton at the Lecture etting in Combined Gas Chromatography - Mass Spectrometry at the school of Pharmacy, London, August 9, 1967. It has come to the authors' attention that this method simultaneously developed by Dr. P. Capella, Institute di Industria Agrarie, University of Bologna, Italy1c (P. Capella and C. M. Zorzut, Anal. Chem. 41, 1458 (1968).)

Zusätzliches Material: 20 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210010413

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