The compliance of 581 drug addicts attending six methadone substitution outpatient clinics was determined over a period of 18 months. Urine from these patients was labeled following oral administration of low molecular weight polyethylene glycols as marker substances. These substances were measured in approx. 5800 urine samples. A protocol for applying marker substances and ways to prevent substitution of urine samples were evaluated. Normal values for marker substances in urine were determined. The results suggest that this labeling procedure is a new diagnostic tool to prevent manipulation of urine samples by drug addicts receiving substitution therapy.
A micromethod for the determination of ca'rbamazepine in small blood samples by high speed liquid chromatography is reported. Carbamazepine is extracted into chloroform and determined by adsorption chromatography on Perisorb A. The minimal quantitatively detectable concentration of carbamazepine is 0.5 mg/1, requiring 100 μ\ of plasma, the relative standard deviation at therapeutic plasma levels being 3.8%.Eine Mikromethode zur Bestimmung von Carbamazepin in kleinen Blutproben durch Fl ssigkeitschromatographie mit hohen Eingangsdrucken wird beschrieben. Carbamazepin wird mit Chloroform extrahiert und mittels Adsorptionschromatographie auf Perisorb A analysiert. Geht man von 100 μ\ Plasma aus, so betragen die minimal nachweisbare Carbamazepin-Konzentration 0,5 mg/1 und die relative Standardabweichung 3,8% im therapeutischen Bereich.
Es wird ein flüssigkeitschromatographisches Verfahren mit hohen Eingangsdrucken 2ur Analyse von Diphcnylhydantoin in kleinen Blutproben beschrieben. Nach Oxidation von Diphenylhydantoin wird das entstehende Benzophenon mit /-Octan ausgeschüttelt und durch Adsorptionschromatographie mit Naphthalin als innerem Standard bestimmt. Geht man von 50 Serum aus, so beträgt die minimale quantitativ bestimmbare Diphenylhydantoin-Konzentration l mg/1 und die relative Standardabweichung 6% im therapeutischen Bereich.
A micrometbod for the determination of diphenylhydantoin( Phenhydan) in blood by high speed liquid chromatographyA rnicromethod for the determination of diphenylhydantoin in small blood samples by high speed liquid chromatography is reported. -Diphenylhydantoin is converted to diphenyl ketone, which is extracted into /-Octane and determined by adsorption chromatography on silica gel, using naphthalene as an internal standard. The minimal quantitatively detectable concentration of diphenylhydantoin is 1 mg/1, using a 50 \ sample of serum, with a relative standard deviation at therapeutic plasma levels of 6%.
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