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References in periodicals archive ?
Blank plasma samples were thawed at room temperature and then spiked with different concentrations of Piroxicam and 5-hydroxypiroxicam, while the internal standard concentration was kept constant (500 ng/mL) in all spiked plasma samples and vortexed for 2 min.
suggest an A/IS cutoff for cocaine use at 0.026 for cocaine and 0.018 for benzoylecgonine to distinguish from background samples after adding 100 [micro]L of internal standard solution (50 ng/mL) as reconstitution solvent (2).
An acetonitrile solution containing 20 ng/mL internal standard gelsenicine was prepared by diluting gelsenicine stock solution with acetonitrile.
Discussion is provided on sample handling, the addition of internal standards, the number of calibrants, the number of replicate measurements, sample queue design, drift and inhomogeneity, integration of partially separated components, use of controls, and measurement traceability.
To prepare an internal standard solution, about 0.035 [+ or -] 0.01 g of curcumin standard was dissolved in acetonitrile, making up to a volume of 50 ml of glass-stoppered conical flask.
Stavudine and internal standard were monitored in the negative ion mode using a Turboion spray interface.
In that method, the labeled SILAC protein is used as a calibrator while it is used as an internal standard in our method.
The purpose of this study was to evaluate the influence of the internal standard peak on the measured degree of conversion (DC) for methacrylatebased resins analyzed by FTIR.
With the technology, there is very limited or no impact to internal standard operating procedures (SOPs) and quality control procedures, enabling easy adopting of simply paperless in any clean room.
"What Motorola decided was that rather than track all the individual components that we use to each of these initiatives, we would develop our own internal standard: we'd pick the toughest and most restrictive limits for each of the substances and that's what we'd measure against."
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