On-line photochemical derivatization and flow-injection spectrophotometric determination of ergonovine maleate

Determination and pharmacokinetics of ergometrine maleate in rabbit blood with on line microdialysis sampling and fluorescence detection

The study describes a flow injection on-line microdialysis system for in vivo monitoring of ergometrine maleate in rabbit blood with fluorescence detection. A flow-through microdialysis probe was used for intravenous sampling by pumping of the blood from the tested rabbit through the flow-through microdialysis probe located outside the living system at a flow rate of 15 microl min-1. The perfusion rate is 5 microl min-1. The ergometrine maleate in the dialysate was detected on-line with a flow injection fluorescence system after the ergometrine maleate administration (0.2 mg kg-1, i.v.). The dialysate sample volume was about 15 microl. The system was linearly related to the concentration of ergometrine maleate in the range 1-140 ng ml-1 (r=0.9989) with a detection limit 0.3 ng ml-1 (3sigma). The pharmacokinetic parameters of ergometrine maleate were calculated utilizing the pharmacokinetic software 'NDST-21' by a one-compartmental open model.

Determination of ergometrine maleate by fluorescence detection

A simple, accurate, sensitive and selective fluorescence analysis method for rapid determination of trace amounts of ergometrine maleate has been developed. The method is based on the fluorescence of ergometrine maleate. The calibration graph was linear in the range of 1 x 10(-4) to 0.2 microg/mL and the detection limit was 4 x 10(-5) microg/mL, with a relative standard deviation of 0.32% at 0.05 microg/mL (n = 11) ergometrine maleate. The influence of foreign compounds was tested. The proposed method was applied successfully to the determination of ergometrine maleate in pharmaceutical preparations and human plasma.