Direct quantitation of the preservatives benzoic and sorbic acid in processed foods using derivative spectrophotometry combined with micro dialysis.

The preservatives benzoic acid and sorbic acid are generally quantified with separation techniques, such as HPLC or GC. Here we describe a new method for determining these compounds in processed food samples based on a narrowness of the UV-visible spectral band width with derivative processing. It permits more selective identification and determination of target analytes in matrices.

Retention Behavior of Halogenated Benzenes on a Stationary Phase Having a 2,4-Dibromophenoxy Group as the Halogen Recognition Functional Group.

A stationary phase with a dipole interaction was synthesized by immobilizing the 2,4-dibromophenoxy (DBP) group onto a hydrophilic base resin. The chromatographic properties for halogenated benzenes were evaluated on the DBP-resin by reversed phase mode. The separation efficiency of the DBP-resin for p-xylene and 1,4-dihalogenated benzenes was better than that of the column packed with octadecylsilane (ODS).