Document Detail

Detection of potentially allergenic hazelnut (Corylus avellana) residues in food: a comparative study with DNA PCR-ELISA and protein sandwich-ELISA.
MedLine Citation:
PMID:  12358443     Owner:  NLM     Status:  MEDLINE    
Allergen detection is of increasing interest for food labeling purposes. A comparative study with a commercial hazelnut-specific PCR-ELISA and a sandwich-type ELISA detecting hazelnut protein was performed to investigate to what extent immunochemical and DNA-based techniques would correlate in the detection of trace amounts of potentially allergenic hazelnut residues. Both methods were highly sensitive and allowed the detection of even <10 ppm of hazelnut in complex food matrixes. The protein-ELISA was highly specific for hazelnut. However, some foods could lead to false-positive results at the 10 ppm level. The PCR-ELISA did not show any cross-reactions with non-hazelnut foods, thus reducing the probability of having false positives at the trace level. Forty-one commercial food products with and without hazelnut components on their labels were analyzed for the presence of hazelnut. Of the 27 products in which hazelnut components were detected, two samples were not identified by the protein-ELISA, and only one sample, namely one white chocolate having <1 ppm of hazelnut protein, was not detected by PCR-ELISA. The good correlation of the results of PCR-ELISA and protein-ELISA suggested that both PCR-based and immunochemical techniques are suitable for reliable detection of potentially allergenic hazelnut residues in foods at the trace level.
Thomas Holzhauser; Oliver Stephan; Stefan Vieths
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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:  50     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2002 Oct 
Date Detail:
Created Date:  2002-10-02     Completed Date:  2002-11-19     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:  5808-15     Citation Subset:  IM    
CONGEN Biotechnology, Robert-Roessle-Strasse 10, D-13125 Berlin, Germany.
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MeSH Terms
Allergens / analysis*
Corylus / chemistry*,  genetics,  immunology
DNA, Plant / analysis
Enzyme-Linked Immunosorbent Assay*
Food Analysis / methods*
Food Hypersensitivity* / prevention & control
Plant Proteins / analysis,  genetics
Polymerase Chain Reaction*
Sensitivity and Specificity
Reg. No./Substance:
0/Allergens; 0/DNA, Plant; 0/Plant Proteins

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

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