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A simple and fast capillary gas chromatographic method with flame ionisation detection (FID) has been developed for the analysis of fluoxetine, fluvoxamine, citalopram, sertraline and paroxetine in their pharmaceutical preparations, using clomipramine as internal standard in order to achieve quantification.
According to the stakeholder, NORMAN should also have a role in ensuring improvement of the ability of laboratories to achieve quantification limits (LOQs) in line with toxicologically relevant concentrations in the marine environment.
To achieve quantification of the Hp-T3 glycoforms, intense oxonium ions that are easily generated in CID of glycosylated-peptides, were selected for quantification.
The peak area of each analyte was divided by the appropriate internal standard peak area, and this analyte/internal standard ratio was used to achieve quantification by the internal standard method.
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Overall, the MRAC-atlas achieves quantification accuracy similar to CTAC with a small but measurable difference of 5% in values, which is 2.6% higher than the error of the MRAC-patient.
All together, we have achieved quantification of 259 unique phosphorylation sites from 154 unique phosphopeptides corresponding to 132 protein groups.
We found that our new EB/AO method achieved quantification results comparable to those produced using the conventional EB/AO method for both suspension and adherent cells.
We achieved quantification of the stained area by dissolving stain in 4% IGEPAL (vol/vol isopropanol) and measuring absorption at 490 nm.
The standard calibrator origin and structural conformation were shown crucial to achieve accurate quantification.
It can be difficult to achieve reliable quantification of peptides that occur at relatively low abundance in complex mixtures using MS methods due to co-eluting, interfering peptides or misidentified and misquantified peptide transitions46.
The assay is rapid for specimen concentrations ≥1 mg/l and is easily tuned to achieve low quantification limits at high chromatographic resolution for lower concentrated samples.
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