毛细管电泳法同时测定化妆品中氢醌、苯酚和防腐剂

采用毛细管电泳法对化妆品中氢醌、苯酚、山梨酸和苯甲酸进行了分离研究,考察了缓冲溶液的种类和pH值对分离的影响.以15 mmol/L硼砂(pH 9.2)为电泳缓冲液,采用压力进样方式,在20 kV恒压下进行分离,并在波长240 nm处检测,各组分可达到基线分离.4种标样在0.5～ 100.0 mg/L范围内呈良好线性关系...

Determination of hydroquinone,phenol and preservatives in cosmetics by capillary electrophoresis

Hydroquinone,phenol,sorbic acid,and benzoic acid in cosmetics were separated and studied by capillary electrophoresis technique.The effects of experimental parameters including pH,the kind of buffer,and buffer concentration on the separation were investigated.From the experiments,we found the optimum electrophoretic conditions were as follows: 15 mmol/L borate as the running buffer(pH 9.2),applied voltage of 20 kV,detection wavelength of 240 nm.Under the optimum conditions,baseline-separation of each compon...