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Determination of phenolic preservatives in gelatin and vacant capsules for medicine use by ion-suppression reversed-phase high performance liquid chromatography.

The Ministry of Education, Center of Materials Analysis and Department of Chemistry, Nanjing University, 22 Hankou Road, Nanjing 210093, PR China.
Journal of Pharmaceutical and Biomedical Analysis (Impact Factor: 2.95). 03/2005; 37(2):369-72. DOI:10.1016/j.jpba.2004.11.001
Source: PubMed

ABSTRACT A reliable method for the simultaneous determination of phenolic preservatives parahydroxybenzoic acid, methyl, ethyl, propyl, butyl and pentyl parahydroxybenzoates in gelatin and vacant capsules for medical use has been developed by ion-suppression reversed-phase high performance liquid chromatography. Separation was carried out on a Kromasil C(18) column by isocratic elution using methanol-perchloric acid (pH 2.0; 10 mM) (60:40, v/v) at a flow-rate of 1.0 ml min(-1), and detection by UV absorbance at a wavelength of 254 nm. This method has been successfully applied to the routine analyses of these preservatives in the real samples.

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