Detection and quantification of ricin in beverages using isotope dilution tandem mass spectrometry.
Anal Chem
; 83(8): 2897-905, 2011 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-21428278
ABSTRACT
The toxic plant protein ricin has gained notoriety due to wide availability and potential use as a bioterrorism agent, with particular concern for food supply contamination. We have developed a sensitive and selective mass spectrometry-based method to detect ricin in tap water, 2% milk, apple juice, and orange juice. Ricin added to beverage matrices was extracted using antibody-bound magnetic beads and digested with trypsin. Absolute quantification was performed using isotope dilution mass spectrometry with a linear ion trap operating in product-ion-monitoring mode. The method allows for identification of ricin A chain and B chain and for distinction of ricin from ricin agglutinin within a single analytical run. Ricin-bound beads were also tested for deadenylase activity by incubation with a synthetic ssDNA oligomer. Depurination of the substrate by ricin was confirmed by matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOFMS). This method was used successfully to extract ricin from each beverage matrix. The activity of recovered ricin was assessed, and quantification was achieved, with a limit of detection of 10 fmol/mL (0.64 ng/mL).
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Ricina
/
Bebidas
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Marcação por Isótopo
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article