合成食用色素日落黄、亮蓝的示波极谱测定

Oscillopolarographic determination of sunset and indigo carmine in foods

本文提出了用示波极谱法测定合成食用色素日落黄、亮蓝的方法。用该法测定日落黄的最佳体系为0.1mol/L NH_3—NH_4Cl缓冲液(pH8～9),测定亮蓝的最佳体系为0.25mol/L NaAc—1.4mol/L HAC的缓冲液(pH3.6)。在一定浓度范围内,峰高与两色素的浓度成正比。该方法选择性好,灵敏度高,已成功地应用于某些食品中日落黄和亮蓝的测定。

A method for the determination of sunset and indigo carmine in food by oscillopolarography has bcen established. The optimum systems for the sunset and indigo carmine arc 0.1 mol/L NH_3NM_4cl (pH8—9)and 0.25 mol/L NaAc—1.4 mol/L HAc(pH 3.6).re spectlvely. The change of peak height with concentration of sunset and indigo carmine is linear. The method is good at selectivity and sensitivity. The mothod has been successfully applied to the determination of sunset and indigo carmine in food.