Journal
ELECTROPHORESIS
Volume 30, Issue 19, Pages 3413-3418Publisher
WILEY
DOI: 10.1002/elps.200900238
Keywords
Amperometric detection; CE microchip; Frauds; Screening confirmation; Vanilla markers
Funding
- Ministry of Science and Technology (Spain) [CTQ2007-61830, CTQ2005-09079-C03-03]
- Junta Comunidades Castilla-La Mancha [PCC08-0015-0722]
- JCCM
- University of Castilla-La Mancha
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A new strategy based on the fast separation of the fingerprint markers of Vanilla planifolia extracts and vanilla-related samples on microfluidic-electrochemistry chip is proposed. This methodology allowed the detection of all required markers for confirmation of common frauds in this field. The elution order was strategically connected with sequential sample screening and analyte confirmation steps, where first ethyl vanillin was detected to distinguish natural from adultered samples; second, vanillin as prominent marker in V. Planifolia, but frequently added in its synthetic form; and third, the final detection of the fingerprint markers (p-hydroxybenzaldehyde, vanillic acid, and p-hydroxybenzoic acid) of V. Planifolia with confirmation purposes. The reliability of the proposed methodology was demonstrated in the confirmation the natural or non-natural origin of vanilla in samples using V planifolia extracts and other selected food samples containing this flavor.
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