1 Scope
This standard specifies the gas chromatographic method for determination of methylparaben, ethylparaben, propylparaben and butylparaben in foods.
This standard is applicable to the determination of methylparaben, ethylparaben, propylparaben and butylparaben in soy sauce, vinegar, beverages and jam.
2 Principle
Extract p-hydroxybenzoic acid esters with ethyl ether after specimen is acidized, concentrate it to nearly dry and then redissolve it with ethanol, and then carry out separation and determination by gas chromatographic method with hydrogen flame ionization detector, finally carry out qualitative analysis according to retention time and quantitative analysis by external standard method.
3 Reagents and Materials
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analytical Procedures
6 Expression of Analysis Results
7 Precision
8 Others
Appendix A Standard Solution Chromatogram of p-hydroxybenzoic Acid Esters
