Standard No.:	GB 5009.31-2016
English Name:	National Food Safety Standard - foodtuffs - Determination of p - hydroxybenzoic acid esters in foodtuffs
Chinese Name:	食品安全国家标准 食品中对羟基苯甲酸酯类的测定
Professional Classification:	GB    National Standard
Source Content Issued by:	National Health and Family Planning Commission
Issued on:	2016-08-31
Implemented on:	2017-3-1
Status:	superseded
Superseded by:	GB 5009.31-2025 National food safety standard - Determination of p-hydroxybenzoic acid esters in foods
Superseded on:	2025-9-16
Superseding:	GB/T 5009.31-2003 Determination of p-hydroxybenzoic acid esters in foods
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	80.0
Delivery:	via email in 1~3 business day

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