Methodological problems of direct bioluminescent ATP assay in platelets and erythrocytes
β Scribed by Girotti, Stefano ;Ferri, Elida ;Cascione, Maria Loredana ;Comuzio, Sergio ;Mazzuca, Augusto ;Orlandini, Alessandro ;Breccia, Alberto
- Publisher
- John Wiley and Sons
- Year
- 1989
- Weight
- 548 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0884-3996
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β¦ Synopsis
Direct bioluminescent ATP determination in platelets and erythrocytes involves the study of different parameters which are discussed here. Some parameters are linked to the bioluminescent reaction and t o the analyte (ATP); others have regard t o the biological matrix. The composition of bioluminescent reagents and the preparation and conservation of the ATP standard, also in the presence of excipients, are among the first given. Matrix problems involve cell characteristics related t o age and form, lysis resistance and the possible formation of aggregates (platelets) that may inhibit the complete release of ATP. For these reasons we used the most efficient ATP release agent with the lowest inhibitory effect on luciferase. The data obtained correlate well with a bioluminescent method requiring extraction with ethanol/EDTA, and therefore more time, for ATP determination in platelets and erythrocytes.
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A bioluminescent assay of bacterial ATP for rapid detection of bacterial growth in 512 clinical aerobic blood cultures was evaluated. At the detection limit of bacterial ATP (lO-'Omol/l) in the blood cultures 94.2% of the true positive blood cultures were detected (sensitivity) and the specificity w
EDTA, pH 7.4 (Na,H,EDTA adjusted with NaOH or Na,EDTA adjusted with. HCl). EDTA is not completely soluble in this mixture, and the precipitated solid becomes finely dispersed in fresh mixtures. Large clumps form after 30 min of storage and E-E was therefore used fresh. On mixing E-E with sample (or