This Application Note describes the analysis of several well known preservatives like benzoic acid, sorbic acid or the esters p-hydroxy benzoic acid (methyl-, ethyl- and propyl-) with the Agilent 1120 Compact LC. It demonstrates the relevance of this method for quality control testing and monitoring of products for consumer protection.
This document describes a method for analyzing common preservatives, such as benzoic acid, sorbic acid, and p-hydroxy benzoic acid esters, in consumer products like chewing gum, ketchup, and toothpaste. The analysis utilizes the Agilent 1120 Compact LC system configured with an EZ-Chrom Elite Compact 3.3 software package.
The method determines benzoic acid, sorbic acid, and the esters p-hydroxy benzoic acid (methyl-, ethyl- and propyl-) in food and drugstore products.
The analysis allows for a 15-min determination of all components.
System suitability testing requires a minimum resolution of 1.5 between each peak.