Analytical Sciences

Abstract − Analytical Sciences, 25(11), 1351 (2009).

Quantification of Sorbic Acid Using the Molecularly Imprinted Chemiluminescence Method with Rhodanine Derivative
Jinghua YU, Congcong ZHANG, Lei GE, Ping DAI, and Shenguang GE
College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
A novel molecular imprinting-chemiluminescence (MI-CL) method for the determination of sorbic acid (SA) was established, taking the molecularly imprinted polymer (MIP) as recognition material and a novel rhodanine derivative as chemiluminescence reagent. The MIP was prepared by a self-assembly technique with SA as template molecule, methacrylic acid (MAA) as functional monomer and ethylene glycol dimethacrylate (EGDMA) as cross-linker. It was found that 3-o-methoxyphenyl-5-(2′-sulfono phenylazo) rhodanine (2MORASP) significantly enhanced the luminescence intensity of the SA-potassium permanganate-hydrochloride acid system. The method was proved to be selective and sensitive. Under the optimized experimental conditions, the system exhibits an excellent linear relationship over the range of 3.0 × 10−7 − 6.0 × 10−4 g mL−1. The detection limit of the proposed method was 2.2 × 10−8 g mL−1. This method was successfully applied to the determination of SA in milk and fruit juice samples.