Background: A straightforward and environment-friendly high-performance liquid chromatography/
diode array detection (HPLC/DAD) method based on cloud-point extraction (CPE) was developed
for the determination of dipyridamole in rat plasma after oral administration.
Methods: The non-ionic surfactant Triton X-114 was chosen as the extract medium. Various parameters
affecting the CPE efficiency were evaluated and optimized. Separation was obtained using a reversedphase
18 column (250 × 4.6 mm, 5 µm) at 30°C with detection wavelength at 292nm
Results: Under the optimum conditions, the assay was linear over the concentration range of 0.1-20.0
with the regression coefficients greater than 0.998, and the lower limit of quantification
(LLOQ) was 0.1 µg mL-1
. The extraction recoveries were more than 83.1%, the accuracies were within
± 9.7%, and the intra-day precision below 5.4% and inter-day precision below 12.6% in all cases.
Conclusion: The validated method is convenient, rapid and accurate for the pharmacokinetic study of
dipyridamole in rat after oral administration.