Development of Extraction Methods for Speciation Analysis of Selenium in Aqueous Extracts of Medicinal Plants

Advanced extraction methods have been developed for direct speciation of dissolved inorganic and organic selenium (Se) species in aqueous extracts of medicinal plants (MPs). The inorganic species of Se (SeIV and SeVI) were separated from organic forms by adsorbing inorganic Se on alumina, while the...

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Bibliographic Details
Published in:Journal of AOAC International 2011-07, Vol.94 (4), p.1069-1075
Main Authors: KOLACHI, Nida F, KAZI, Tasneem G, AFRIDI, Hassan I, KHAN, Sumaira, BAIG, Jameel A, WADHWA, Sham K, SHAH, Abdul Q, SHAH, Faheem
Format: Article
Language:English
Subjects:
Biological and medical sciences
Chemical properties
Composition
Extraction (Chemistry)
Food engineering
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
General pharmacology
Hydrogen-Ion Concentration
Identification and classification
Materia medica, Vegetable
Medical sciences
Medicinal plants
Methods
Pharmacognosy. Homeopathy. Health food
Pharmacology. Drug treatments
Physiological aspects
Plant extracts
Plant Extracts - chemistry
Plants, Medicinal - chemistry
Selenium
Selenium - analysis
Water - chemistry
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Summary:Advanced extraction methods have been developed for direct speciation of dissolved inorganic and organic selenium (Se) species in aqueous extracts of medicinal plants (MPs). The inorganic species of Se (SeIV and SeVI) were separated from organic forms by adsorbing inorganic Se on alumina, while the organic Se was not retained. The retained inorganic Se species was eluted with 10 mL 0.2 M HCl. The total inorganic Se species was determined after prereduction of SeVI into SeIV with concentrated HCl. The SeIV in the eluent and total inorganic Se species were then complexed with diethyldithiocarbamate. The resultant complexes were entrapped in the nonionic surfactant Triton X-114. The total Se, organic Se, total inorganic Se, and SeIV species were determined by electrothermal atomic absorption spectrometry with a modifier. The SeVI concentration was obtained by subtracting SeIV from total inorganic Se contents. The main factors affecting the methodologies were investigated in detail. Under the optimized experimental conditions, the LOD for SeIV was 50 microg/L. Among dissolved inorganic and organic Se species in aqueous extracts of MPs, organic Se species were present in the range of 74-84%, SeIV 3.62-7.47%, and SeVI 12.4-18.57% of total Se contents.
ISSN:1060-3271
1944-7922
DOI:10.1093/jaoac/94.4.1069