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Generic capillary electrophoresis conditions for chiral assay in early pharmaceutical development.

Generic capillary electrophoresis (CE) conditions have been implemented for chiral separations in early pharmaceutical development. The chiral CE separations of several pharmaceutical samples at different stages of development, i.e., discovery, process chemistry, and investigative new drug application, have been obtained using sulfated beta-cyclodextrin (CD). Several sulfated beta-CDs have been screened to select an appropriate enantioselective agent. The use of a generic CE method allows for a convenient and rapid chiral recognition of different weak bases, with minimal or no method development. CE using sulfated beta-CD for the chiral separation of N-benzoyl methyl piperazine has been validated for linearity, precision, accuracy, limits of detection and quantitation (LOD, LOQ). Although less sensitive than a specific liquid chromatography method using a Chiralpak AD column, the overall performance of the chiral CE method was found comparable. Validation data demonstrate that a LOD of 0.1%, sufficient to fulfill regulatory requirements, is achievable by chiral CE.

Drug Industry↗

Experience with activated carbon-bead haemoperfusion columns in the treatment of severe drug intoxication. A preliminary report.

Five patients who were severely poisoned with hypnotic drugs, paracetamol, or theophylline were treated by charcoal haemoperfusion. The device contained 160 g of activated carbon beads with a polyester coating. Four patients made a significant improvement; one subsequently died from a cerebral haemorrhage which had occurred prior to haemoperfusion. Platelet losses were minimal and no fibrinolysis was observed. No significant biochemical abnormality occurred as a result of haemoperfusion, although one patient, who presented with hypocalcaemia, required intravenous calcium throughout the procedure.

Acetaminophen↗

The usefulness of the enzymatic tests in acute poisonings.

In the group of 107 patients poisoned by carbon monoxide (18 patients), ethanol (10), barbiturates (18), glutehimide (10), tranquilizers (19), organic solvents (10),salicylates (3), organochlorines (8), and sulfonamides (5)--the activities of 8 serum enzymes were determined for 6 consecutive days of treatment, the enzymes being as follows: aminotransferases, cholinesterase, alkaline phosphatase, lactate, alpha-hydroxybutyrate, glutamate, and sorbitol dehydrogenase. The antipyrine half-life was also assayed. It has been shown that the poisonings by particular groups of poisons do not bring about characteristic changes in the activity of enzymes that might be of any diagnostic value. The intensity of changes was connected withe depth and duration of toxic coma. Most frequently an increase ensued in the activity of AspAt and AlAt in the third 24-hrs period, and an increase in the activity of SDH in the first 24-hrs period. In the group under examination there were 26 drug abusers in whom a shortening of the antipyrine half-life was discovered. They were less responsive to toxic doses of drugs, and the enzymatic changes in them were less distinct. No changes in the activity of tested enzymes, which are characteristic of toxicomania, were found.

Adolescent↗

Induction of drug metabolism in the rat by taglutimide, a sedative-hypnotic glutarimide derivative.

Pretreatment with taglutimide significantly decreased the plasma dicoumarol level and shortened the duration of hexobarbital-induced narcosis in rats. Furthermore, taglutimide pretreatment accelerated the in vitro metabolism of dicoumarol, hexobarbital, o-nitrophenyl acetate and procaine, but not of 3,4-benzypyrene, as assayed in the 10,000xg supernatant fraction of rat liver homogenate. No definite increase was observed in liver wet weight, nor in the amount of microsomal and total liver protein in comparison with the control values. No marked differences were found between the effects of short- (4-day) and long-term (17-day) pretreatment on any of the studied parameters. The changes in drug metabolism and liver protein observed after taglutimide pretreatment differed from those observed after pretreatment with either phenobarbital or 3,4-benzypyrene. Taglutimide, like other inducing agents, is lipophilic, but differs from them in not being a substrate of monooxygenases.

Animals↗