Detection of Thioarsenates in Rice Grains and Rice Products
| Autor: | Andrea Ester Colina Blanco, Britta Planer-Friedrich, Carolin F. Kerl |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
media_common.quotation_subject chemistry.chemical_element 01 natural sciences Arsenic Soil chemistry.chemical_compound Nitric acid Cacodylic Acid media_common Arsenite Chromatography 010401 analytical chemistry Extraction (chemistry) food and beverages Oryza Arsenic speciation General Chemistry 0104 chemical sciences Chromatographic separation Speciation chemistry Plant Structures General Agricultural and Biological Sciences 010606 plant biology & botany |
| Zdroj: | Journal of Agricultural and Food Chemistry. 69:2287-2294 |
| ISSN: | 1520-5118 0021-8561 |
| DOI: | 10.1021/acs.jafc.0c06853 |
| Popis: | Inorganic and methylated thioarsenates have recently been reported to contribute substantially to arsenic (As) speciation in paddy-soil pore waters. Here, we show that thioarsenates can also accumulate in rice grains and rice products. For their detection, a method was developed using a pepsin-pancreatin enzymatic extraction followed by chromatographic separation at pH 13. From 54 analyzed commercial samples, including white, parboiled and husked rice, puffed rice cakes, and rice flakes, 50 contained dimethylmonothioarsenate (DMMTA) (maximum 25.6 μg kg-1), 18 monothioarsenate (MTA) (maximum 5.6 μg kg-1), 14 dimethyldithioarsenate (DMDTA) (maximum 2.8 μg kg-1), and 5 dithioarsenate (DTA) (maximum 2.3 μg kg-1). Additionally, we show that the commonly used nitric acid extraction transforms MTA to arsenite and DMMTA and DMDTA to dimethylarsenate (DMA). Current food guidelines do not require an analysis of thioarsenates in rice and only limit the contents of inorganic oxyarsenic species (including acid-extraction-transformed MTA), but not DMA (including acid-extraction-transformed DMMTA and DMDTA). |
| Databáze: | OpenAIRE |
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