Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R
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 inco...
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| Format: | Article |
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MDPI AG
2018-03-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/3/864 |
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| author | Maria A. Morosanova Zahar V. Samodelov Elena I. Morosanova |
| author_facet | Maria A. Morosanova Zahar V. Samodelov Elena I. Morosanova |
| author_sort | Maria A. Morosanova |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-14T06:50:30Z |
| format | Article |
| id | doaj.art-843ce665f5444641a9eab72329d09325 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-14T06:50:30Z |
| publishDate | 2018-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-843ce665f5444641a9eab72329d093252022-12-22T02:07:02ZengMDPI AGSensors1424-82202018-03-0118386410.3390/s18030864s18030864Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine RMaria A. Morosanova0Zahar V. Samodelov1Elena I. Morosanova2Analytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, Moscow 119234, RussiaAnalytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, Moscow 119234, RussiaAnalytical Chemistry Division, Chemistry Department, Lomonosov Moscow State University, Moscow 119234, RussiaThe 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.http://www.mdpi.com/1424-8220/18/3/864oxalate determinationsilica–titania xerogeltriphenylmethane dyesfood oxalatessolid phase spectrophotometry |
| spellingShingle | Maria A. Morosanova Zahar V. Samodelov Elena I. Morosanova Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R Sensors oxalate determination silica–titania xerogel triphenylmethane dyes food oxalates solid phase spectrophotometry |
| title | Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R |
| title_full | Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R |
| title_fullStr | Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R |
| title_full_unstemmed | Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R |
| title_short | Determination of Food Oxalates Using Silica–Titania Xerogel Modified with Eriochrome Cyanine R |
| title_sort | determination of food oxalates using silica titania xerogel modified with eriochrome cyanine r |
| topic | oxalate determination silica–titania xerogel triphenylmethane dyes food oxalates solid phase spectrophotometry |
| url | http://www.mdpi.com/1424-8220/18/3/864 |
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