Objective: To establish a new determination method for quercitrin from Platycladus orientalis leaves by capillary-zone electrophoresis (CZE). Method: Under the optimized CZE conditions:a running buffer composed of 30 mmol ·L-1 borax-boric acid (volume 1 ∶3)

separation voltage at 25 kV

temperature at 25 centigrade

injection time for 8 sec with 0.5 psi pressure

quercitrin from P. orientalis leaves was detected at 254 nm wavelength. Result: Quercitrin was linear in the range of 1-200 mg ·L-1 (r=0.999 3). The RSD of exactitude

stability

and recovery of the method was 1.1346%

2.6046 % and 2.3315%

respectively. The contents of quercitrin in three batches of P. orientalis leaves were 2.5513

2.5467

2.4780 mg ·g -1. Conclusion: The method was simple

fast and accurate for determination of the drugs containing quercitrin.