Document Detail


Detection of smoked paprika "Pimentón de La Vera" adulteration by free zone capillary electrophoresis (FZCE).
MedLine Citation:
PMID:  16756339     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this work was to develop a procedure based on protein analysis by free zone capillary electrophoresis (FZCE) that can be used in the determination of smoked paprika "Pimentón de La Vera" adulteration with paprika elaborated from varieties of pepper foreign to the "La Vera" region, in central western Spain. Two autochthonous varieties of pepper, Jaranda and Bola, and the variety Papri Queen, foreign to the "La Vera" region, were used in the study. Several aqueous solutions for solubilization of the methanol-soluble proteins were tested, and the FZCE conditions of capillary dimensions, FZCE buffer concentrations, and detection wavelengths were optimized. On the basis of the results, 30% (v/v) acetonitrile was adopted as the suspending solution for routine analysis, and the optimal FZCE parameters were 75 microm inner diameter and 57 cm total length capillaries, 8.75 mM phosphate/20.6 mM tetraborate as run buffer, and 256 nm as detection wavelength. This method was found to give excellent repeatability of the corrected migration time (CMT) with coefficients of variation (RSD %; n = 5) of <1% for most of the proteinaceous compounds analyzed and showed greater effectiveness in discriminating paprika varieties than the SDS-PAGE technique. Four peaks found in the FZCE electropherograms were investigated as a basis for detecting and estimating the adulteration of smoked paprika with paprika elaborated from the Papri Queen variety. The adulteration detection limits varied from 5 to 40% of the Papri Queen variety within a satisfactory working range of mixture (5-80%) sufficiently large to cover the adulteration levels of interest. The use of peak 6 as a marker for determining adulteration gave the best results, with an adulteration detection limit of 5-10% (w/w).
Authors:
Alejandro Hernández; Alberto Martín; Emilio Aranda; Teresa Bartolomé; María de Guía Córdoba
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  54     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-07     Completed Date:  2006-08-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4141-7     Citation Subset:  IM    
Affiliation:
Nutrición y Bromatología, Escuela de Ingenierías Agrarias, Universidad de Extremadura, Ctra. de Caceres s/n, 06071 Badajoz, Spain.
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MeSH Terms
Descriptor/Qualifier:
Buffers
Capsicum / chemistry*
Electrophoresis, Capillary*
Electrophoresis, Polyacrylamide Gel
Food Contamination / analysis*
Proteins / analysis
Smoke
Solubility
Solutions
Spain
Chemical
Reg. No./Substance:
0/Buffers; 0/Proteins; 0/Smoke; 0/Solutions

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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