食品中三聚氰胺的固相萃取-高效液相色谱测定法

目的 建立固相萃取(SPE)-高效液相色谱(HPLC)测定食品中三聚氰胺含量的方法.方法 样品经提取液提取、离心后,上清液于Waters Oasis MCX固相萃取柱净化.采用HPLC进行测定,色谱柱为TIANHE C18柱(250 mm×4.6 mm,5μm),流动相为混合溶液(含0.01 mol/L己烷磺酸钠和0.01 mol/L柠檬酸):乙腈体积比为94:6,流量为1.0 ml/min,柱温为35℃,进样量为20μL.结果 在0.80-80.0mg/L范围内,该方法所得线性方程为:y=84.64x-6.1271,相关系数为0.99998,检出限为0.5mg/kg,平均加标回收率为88.8%～99.0%,RSD＜5%.结论 该方法操作简便、快速,适用于各类食品中三聚氰胺含量的检测.

Abstract：

Objective To establish a solid phase extraction (SPE)-high performance liquid chromatography(HPLC) method for determination of melamine in foods. Methods Melamine in sample was extracted with extractive agent. After centrifugation, the supernatant fluid was purified by Waters Oasis MCX cartridge, and detected with HPLC method. Chromatographic column of TIANHE C_(18)(250 mm×4.6 mm,5 μm) was used at 35 ℃ and mobile phase was water(containing 0.01 mol/L 1-hexanesulfonic acid sodium salt and 0.01 mol/L citric acid): acetonitrile = 94:6 (V:V) at a flow rate of 1.0 ml/min. Injection volume was 20 ui. Results In the range of 0.80 to 80.0 mg/L, the regression equation was y=84.64 x-6.127 1 with the correlation coefficient of 0.999 98. The detection limit of melamine in foods was 0.5 mg/kg. The average rates of recovery were 88.0%-96.0% and the relative standard deviation was less than 5%. Conclusion The method established in the present paper is applicable to determination of melamine in foods with good precision,accuracy and sensitivity.

Determination of Melamine in Foods by Solid Phase Extraction-High Performance Liquid Chromatography

Objective To establish a solid phase extraction (SPE)-high performance liquid chromatography(HPLC) method for determination of melamine in foods. Methods Melamine in sample was extracted with extractive agent. After centrifugation, the supernatant fluid was purified by Waters Oasis MCX cartridge, and detected with HPLC method. Chromatographic column of TIANHE C_(18)(250 mm×4.6 mm,5 μm) was used at 35 ℃ and mobile phase was water(containing 0.01 mol/L 1-hexanesulfonic acid sodium salt and 0.01 mol/L citric acid): acetonitrile = 94:6 (V:V) at a flow rate of 1.0 ml/min. Injection volume was 20 ui. Results In the range of 0.80 to 80.0 mg/L, the regression equation was y=84.64 x-6.127 1 with the correlation coefficient of 0.999 98. The detection limit of melamine in foods was 0.5 mg/kg. The average rates of recovery were 88.0%-96.0% and the relative standard deviation was less than 5%. Conclusion The method established in the present paper is applicable to determination of melamine in foods with good precision,accuracy and sensitivity.