31P NMR analysis of red blood cell UDPGlucose and UDPGalactose: comparison with HPLC and enzymatic methods.
Anal Biochem
; 202(1): 105-10, 1992 Apr.
Article
em En
| MEDLINE
| ID: mdl-1621971
ABSTRACT
The levels of uridine diphosphogalactose (UDPGal) and uridine diphosphoglucose (UDPGlu) in trichloroacetic acid extracts of human red blood cells (RBC) were measured by 31P NMR spectroscopy. Individual determinations were compared to results obtained by enzymatic and high-pressure liquid chromatographic (HPLC) methods. The characteristic doublet of the P beta resonance signals of both UDPGal and UDPGlu were detected in proton-decoupled spectra of extracts. Quantitative analyses were obtained by employing a standard, methylene diphosphonate, in an external capillary tube during data acquisition for periods of 14 to 24 h using an "inverse-gated" pulse sequence. The ratio of the integrated area of each of the uridine sugar nucleotide doublets to the area of the external reference peak was linear with concentrations between 0.03 and 0.50 mM. There was no difference between the mean value obtained by 31P NMR of 6.6 +/- 1.4 mumol UDPGlu/100 g Hgb or 2.1 +/- 0.6 mumol UDPGal/100 gHgb and the corresponding levels determined enzymatically or by HPLC in identical RBC extracts. When analyzed as paired data, only UDPGlu by NMR was found to be lower than the value obtained by HPLC. As a quantitative analytical tool, NMR spectrometry validated both the enzymatic and HPLC methods used for measurement of uridine sugar nucleotides in our laboratories.
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Base de dados:
MEDLINE
Assunto principal:
Uridina Difosfato Galactose
/
Uridina Difosfato Glucose
/
Espectroscopia de Ressonância Magnética
/
Eritrócitos
Idioma:
En
Revista:
Anal Biochem
Ano de publicação:
1992
Tipo de documento:
Article