The analysis of dissolution samples by conventional spectrophotometers or conventional HPLC separations can require a large amount of time when analyzing the number of samples collected from a dissolution test. With the JASCO LC Dissolution rate calculation program and a vial rack which can be used for both of the DT-810 Dissolution Tester and the X-LC 3159AS auto-sampler, the combination of the DT-810 and the extreme high speed liquid chromatography (X-LC) systems provide a smooth measurement from the dissolution test to LC analysis. Using the X-LC, which is capable of reducing analysis time, 5 to 10 times less as compared to conventional HPLC, also makes it possible to offer a significant reduction of the total analysis time.