My watch list
my.chemeurope.com  
Login  

Sensors, Vol. 18, Pages 864: Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R

Sensors, Vol. 18, Pages 864: Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R

Sensors doi: 10.3390/s18030864

Authors: Maria Morosanova Zahar Samodelov Elena Morosanova

The interaction of silica–titania xerogel with triphenylmethane dyes (pyrocatechol violet, chrome azurol S, eriochrome cyanine R) has been investigated to create a new sensor material for solid phase spectrophotometric determination of food oxalates. The complex forming reaction between xerogel incorporated titanium(IV) and triphenylmethane dyes has been studied; half-reaction periods, complex composition, equilibrium constants, and xerogel sorption capacity have been calculated for each dye. Eriochrome cyanine R (ECR) is characterized by the shortest half-reaction period, the smallest equilibrium constant, and the greatest capacity; it has been chosen for the sensor material construction because titanium(IV)-ECR complex is formed faster and can be destroyed easier than other studied complexes. The interaction of this sensor material with oxalates has been described: the presence of oxalates causes sensor material discoloration and the absorbance is used as analytical signal. The analytical range is 35–900 mg/L (LOD 10.5 mg/L, n = 7). High concentrations of interfering inorganic anions, organic acids, and sucrose did not affect oxalate determination. Proposed solid phase spectrophotometric procedure has been successfully applied for the determination of oxalates in food samples (sorrel, spinach, parsley, ginger, and black pepper) and the results are in good agreement with HPLC oxalate determination.

Authors:   Morosanova, Maria A.; Samodelov, Zahar V.; Morosanova, Elena I.
Journal:   Sensors
Volume:   18
edition:   3
Year:   2018
Pages:   864
DOI:   10.3390/s18030864
Publication date:   15-Mar-2018
Facts, background information, dossiers
  • ginger
  • discoloration
  • complexes
More about Molecular Diversity Preservation International
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE