Journal
FOOD CHEMISTRY
Volume 131, Issue 1, Pages 380-385Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2011.08.056
Keywords
Magnetic cation-exchange resin; Solid support derivatization; Formaldehyde; Fruit juice; High-performance liquid chromatography
Funding
- Natural Science Foundation of China [20875037]
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A method was developed using magnetic strong cation-exchange resin modified with 2,4-dinitrophenyl-hydrazine (DNPH) for the determination of formaldehyde (HCHO) in fruit juice samples. The procedures of extraction and derivatization were carried out in a single step by stirring the resins and diluted fruit juice with water. When the procedures were completed, the resins adsorbing the HCHO-DNPH derivative were easily separated from the sample matrix by an adscititious magnet. The HCHO-DNPH derivative eluted from the resins was directly determined by high-performance liquid chromatography with UV detector at 360 nm. The limit of detection of the proposed method in fruit juice obtained is 6.0 ng mL(-1). In this work, the volume of fruit juice was 5 mL and the amount of MSCX resins was 100 mg, and the resins can be reused 10 times. The relative standard deviations of intra-day and inter-day ranging from 3.9% to 6.1% and from 4.2% to 7.0% are obtained, respectively. The recovery of HCHO in the analysis of spiked fruit juice samples is in the range of 85.7-100.4%. (C) 2011 Elsevier Ltd. All rights reserved.
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