Abstract: Astopped-flow kinetic spectrophotometric method is proposed for the simultaneous determination of ascorbic acid (Vc ) and L-cysteine(L-cys)in fruit juices.The calibration graphs are linear for 0-24.0-280mg/L and the detection limits are lmg/ L and 16mg/L for Vc and L-cys.respectively.The injectd sample volume is 157uL and the sampling rate is 30 samples/h.This method is simple rapid. sensitive and accurate with high selectivity and has been applied for determination of Vc and L-cys in strawberry juice.The marked recovery rates are up to 95.2%and 92.8%for Vc and L-cys respectivily.

Key words: Stopped Folw Analysis Simultaneous Determination Spectrophotometric method Ascorbic acid L-cysteine