A new analytical method based on anti-EPO monolith column and LC-FAIMS-MS/MS for the detection of rHuEPOs in horse plasma and urine samples.

Recombinant human erythropoietin (rHuEPO) is a 30-34 kDa glycoprotein banned by the racing authorities. For some years this molecule has been detected in race horses in USA and in Europe, and even in racing camels. Although direct methods to differentiate horse endogenous EPO and rHuEPO have been developed either by LC-MS/MS or by isoelectric focusing (IEF) with double-blotting, the short confirmation time of such prohibited hormone in plasma remains a problem for horseracing doping control laboratories.

Evaluation of laser diode thermal desorption (LDTD) coupled with tandem mass spectrometry (MS/MS) for support of in vitro drug discovery assays: increasing scope, robustness and throughput of the LDTD technique for use with chemically diverse compound libraries.

Within the drug discovery environment, the key process in optimising the chemistry of a structural series toward a potential drug candidate is the design, make and test cycle, in which the primary screens consist of a number of in vitro assays, including metabolic stability, cytochrome P450 inhibition, and time-dependent inhibition assays. These assays are often carried out using multiple drug compounds with chemically diverse structural features, often in a 96 well-plate format for maximum time-efficiency, and are supported using rapid liquid chromatographic (LC) sample introduction with a tandem mass spectrometry (MS/MS) selected reaction monitoring (SRM) endpoint, taking around 6.5 h per plate.

Validated quantitation method for a peptide in rat serum using liquid chromatography/high-field asymmetric waveform ion mobility spectrometry.

The analysis of peptides presents serious challenges for bioanalytical scientists including low total ion current and non-selective fragmentation during tandem mass spectrometry (MS/MS). During method validation of a peptide in rat serum matrix some interferences could not be easily removed and thus prevented accurate and precise measurement. These problems associated with peptide quantitation were resolved by using FAIMS (high-Field Asymmetric waveform Ion Mobility Spectrometry).

Chlorproguanil/dapsone for uncomplicated Plasmodium falciparum malaria in young children: pharmacokinetics and therapeutic range.

The disposition of chlorproguanil/dapsone (one daily dose for 3 d of 1.2 and 2.4 mg/kg respectively) has been studied in young children with Plasmodium falciparum malaria, to provide data complementary to a clinical trial of this drug combination.

Marked variation in pyrimethamine disposition in AIDS patients treated for cerebral toxoplasmosis.

We have characterized the disposition of pyrimethamine in 20 adults with advanced AIDS. After the first dose, the area under concentration versus time curves (corrected for dose-size) varied 13-fold. This marked variation in drug levels was also noted during accumulation towards steady-state: pyrimethamine levels were consistently below the suggested lower end of the therapeutic range (750 mg/L) in three severely ill patients with perturbed consciousness (two of whom received the drug by nasogastric tube).