## Abstract Based on experimentally determined concentrations of PCr, __P__~i~, ATP, and H^+^, the ADP and AMP concentrations and the free energy for the ATP hydrolysis in normal human brain and muscle were calculated assuming that the creatine kinase‐ and the myokinase‐catalyzed reactions were in
31P NMR Methods for the Direct Determination of ADP in the Presence of ATP
✍ Scribed by Dafna Ben-Bashat; Hadassah Shinar; Gil Navon
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 174 KB
- Volume
- 110
- Category
- Article
- ISSN
- 1064-1866
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✦ Synopsis
A new method is presented for the direct measurement of the amount of ADP in the presence of ATP by selectively eliminating the alpha- and gamma-ATP signals. The method is compared with other methods, both experimentally and theoretically, using the product-operator formalism. An analysis of the effect of beta 1 inhomogeneity on the efficiency of the methods is also given. Experimental results obtained using adiabatic pulses to compensate for such effects are shown. The accuracy of this new method is demonstrated by measuring various ADP concentrations in a series of solutions containing ADP and ATP.
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We describe a modified colorimetric method that quantitates inorganic phosphate linearly up to 60 nmol, with high stability of the developed color and with a low interference by ATP concentration (up to 30 mM). This method is very suitable for use in ATPase enzymatic assays, especially with enzymes
## Abstract ^31^P MRS examinations of the calf muscles of 12 healthy volunteers were performed to determine __T__~2~ of the coupled ATP signals by using the 90°–TE/2–2662‐TE/2‐acq selective spin‐echo sequence for elimination of phase and intensity distortions. The __T__~2~ relaxation times obtained
## Abstract T~2~ measurements of ^31^P NMR signals of ATP using the Hahn 90°–180° spin‐echo sequence imply difficulties whenever the 180° pulse angle is not completely perfect. The reason for this finding is the crucial influence of the __J__ ‐couplings of the ATP signals which result in intensity