Abstract: Capillary zone electrophoresis (CZE) was used to determine t he cont ent of chlorogenic acid in green tea . The buffer solution used in this method was pH 8.5 and 20 mmol/L sodium borate solution .Under 20℃, the separating vol tage was 20kV . Sodium benzoate used as interna l standard and 50% methanol use d as extraction , the wavelength of de tection was 328 nm .The content of chloro genic acid was 10.25 mg/g in g reen tea , the calibration curve showed good lin earity over the range of 0.03～0.15 mg/ml, the average recovery was 99.75% , RSD was 1.4% .

Key words: CZE, green tea, chlorogenic acid