Analytical and Bioanalytical Chemistry

, Volume 389, Issue 7–8, pp 2297–2302 | Cite as

Surfactant to dye binding degree based approach for the selective determination of l-glutamate in foodstuffs

  • Ana Pedraza
  • María Dolores Sicilia
  • Soledad Rubio
  • Dolores Pérez-BenditoEmail author
Original Paper


A selective method for the determination of l-glutamate in foodstuffs has been developed. It was based on the competition established between the analyte and the dye Coomassie brilliant blue G (CBBG) to interact with the surfactant didodecyldimethylammonium bromide (DDABr). The measurement parameter was the amount of DDABr required to reach a given dye-to-surfactant binding degree. It was obtained by photometric titration on the basis of the changes observed in the spectral characteristics of the dye when CBBG–DDABr aggregates were formed. The calibration graph obtained was linear in the l-glutamate concentration interval 0.2–5 mM (detection limit 0.05 mM). The high selectivity of the proposed method (other amino acids and food additives did not interfere at the concentrations present in foodstuffs) permitted the direct analysis of food samples after dissolution of the analyte in hot water. The accuracy of the surfactant to the dye binding degree method was demonstrated by determining l-glutamate in different kinds of foodstuffs (liquid and dried soups, seasonings, pasta sauces and dried mushroom creams) and comparing the results obtained with those provided by the commercial Boehringer Mannheim essay.


Surfactant to dye binding degree method l-Glutamate Food analysis Routine quality control 



The authors gratefully acknowledge financial support from CICyE (Junta de Andalucía, project no. FQM 166).


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Ana Pedraza
    • 1
  • María Dolores Sicilia
    • 1
  • Soledad Rubio
    • 1
  • Dolores Pérez-Bendito
    • 1
    Email author
  1. 1.Department of Analytical ChemistryFaculty of Sciences, University of Córdoba, Edificio Anexo Marie CurieCórdobaSpain

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