Flow injection determination of Se in dietary supplements using TiO2 mediated ultraviolet-photochemical volatile species generation

Nováková, Eliška; Linhart, Ondřej; Červený, Vlastislav; Rychlovský, Petr; Hraníček, Jakub

doi:10.1016/j.sab.2017.06.007

Cited by 18 publications

(3 citation statements)

References 44 publications

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“…The use of SRM 3280 for the determination of minerals and toxic elements (As, Cd) for both method development and validation has been reported by several researchers using ICP/MS ( 54 , 55 , 60 , 71 , 72 ) and AAS ( 63 , 69 ). Wolle et al used SRM 3280 for extraction method development in the determination of arsenic in dietary supplements ( 65 ).…”

Section: Case Studies Of Research Using Dietary Supplement Matrix Crmsmentioning

confidence: 99%

The Importance of Reference Materials and Method Validation for Advancing Research on the Health Effects of Dietary Supplements and Other Natural Products

2021

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Insufficient assessment of the identity and chemical composition of complex natural products, including botanicals, herbal remedies, and dietary supplements, hinders reproducible research and limits understanding mechanism(s) of action and health outcomes, which in turn impede improvements in clinical practice and advances in public health. This review describes available analytical resources and good methodological practices that support natural product characterization and strengthen the knowledge gained for designing and interpreting safety and efficacy investigations. The practice of validating analytical methods demonstrates that measurements of constituents of interest are reproducible and appropriate for the sample (e.g., plant material, phytochemical extract, and biological specimen). In particular, the utilization of matrix-based reference materials enables researchers to assess the accuracy, precision, and sensitivity of analytical measurements of natural product constituents, including dietary ingredients and their metabolites. Select case studies are presented where the careful application of these resources and practices has enhanced experimental rigor and benefited research on dietary supplement health effects.

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Section: Case Studies Of Research Using Dietary Supplement Matrix Crmsmentioning

confidence: 99%

The Importance of Reference Materials and Method Validation for Advancing Research on the Health Effects of Dietary Supplements and Other Natural Products

2021

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“…Its increasing usage has generated a considerable amount of selenium-contaminated wastewater, mainly containing selenate and selenite [ 5 ]. Although Se is an essential trace element for human health at the concentration range from 0.8 to 1.7 µmol/L, excessive intake of Se could lead to serious health issues [ 6 , 7 ]. The United States Environmental Protection Agency (US EPA) has mandated the maximum contaminant level of Se in drinking water at 50 µg/L [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Artificial Intelligence Based Optimization for the Se(IV) Removal from Aqueous Solution by Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron Composites

Cao

Fan

et al. 2018

Materials

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Highly promising artificial intelligence tools, including neural network (ANN), genetic algorithm (GA) and particle swarm optimization (PSO), were applied in the present study to develop an approach for the evaluation of Se(IV) removal from aqueous solutions by reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites. Both GA and PSO were used to optimize the parameters of ANN. The effect of operational parameters (i.e., initial pH, temperature, contact time and initial Se(IV) concentration) on the removal efficiency was examined using response surface methodology (RSM), which was also utilized to obtain a dataset for the ANN training. The ANN-GA model results (with a prediction error of 2.88%) showed a better agreement with the experimental data than the ANN-PSO model results (with a prediction error of 4.63%) and the RSM model results (with a prediction error of 5.56%), thus the ANN-GA model was an ideal choice for modeling and optimizing the Se(IV) removal by the nZVI/rGO composites due to its low prediction error. The analysis of the experimental data illustrates that the removal process of Se(IV) obeyed the Langmuir isotherm and the pseudo-second-order kinetic model. Furthermore, the Se 3d and 3p peaks found in XPS spectra for the nZVI/rGO composites after removing treatment illustrates that the removal of Se(IV) was mainly through the adsorption and reduction mechanisms.

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“…Photochemical vapor generation (PVG) is emerging as an alternative sample introduction method in atomic spectrometry with the characteristics of simple, sensitive, and green. − During the past nearly two decades, novel PVG hardware, including PVG reactors and gas–liquid phase separators, was developed to improve the generation and phase separation efficiencies. − Besides, the use of semiconductive materials can promote the formation of photogenerated electrons and positive holes at the valence band under UV irradiation, which facilitates the photochemical reduction of elements in the PVG system. Materials including nano-TiO 2 /doped TiO 2 , metal–organic frameworks (MOFs), and C 3 N 4 /doped C 3 N 4 have been demonstrated for efficiently enhancing PVG yields of analytes like Se and As. − Recently, the addition of transition ions was found to be efficient for promoting the photochemical reduction of elements even for those which are inert toward semiconductive materials-based catalysis. The enhancement ranges from 1.4 to 30 000-fold for analytes including Pb, , As, Bi, , Te, , Os, , Ru, , Cd, Re, W, Mo, , Hg, Ir, Rh, Tl, Cl, Br, , and F .…”

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confidence: 99%

Vanadium Species-Assisted Photochemical Vapor Generation for Direct Detection of Trace Tellurium with Inductively Coupled Plasma Mass Spectrometry

et al. 2022

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Photochemical vapor generation (PVG) is emerging as an alternative sample introduction method in the field of atomic spectrometry. The addition of transition metals can largely improve the PVG yields of elements with the enhancement of 1.4 to 30 000-fold, based on previous reports. In this work, the use of vanadium species as novel "sensitizers" in PVG was first reported, tellurium (Te) was selected as the target. The efficient photochemical reduction of Te was observed in the presence of 9% (v/v) formic acid (FA), 20%(v/v) acetic acid (AA), and 40 mg L −1 of V(V) (existing as VO 3 − ) with the conversion efficiency of 87 ± 3%. Under the selected conditions, there was no significant difference in analytical sensitivity between Te(IV) and Te(VI), making the direct detection of total Te possible. The limit of detection (LOD, 3σ) was 2.9 ng L −1 for Te with inductively coupled plasma mass spectrometry (ICP MS) measurement. Good precisions of 2.3% and 2.2% (relative standard deviations, RSD) for seven times replicate measurement of 0.5 μg L −1 Te(IV) and Te(VI) standard solutions were obtained. The sensitivity was enhanced about 55fold compared to that using traditional direct solution nebulization. The method was applied for the determination of trace Te in three water samples and two certified reference materials of sediment with satisfactory results. The possible mechanism was investigated. The generation of volatile vanadium along with (CH 3 ) 2 Te was found in PVG for the first time. The new findings in this work will be helpful for exploration of efficient "sensitizers" in PVG and further expanding the scope of elements amenable to PVG as well.

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Flow injection determination of Se in dietary supplements using TiO2 mediated ultraviolet-photochemical volatile species generation

Cited by 18 publications

References 44 publications

The Importance of Reference Materials and Method Validation for Advancing Research on the Health Effects of Dietary Supplements and Other Natural Products

The Importance of Reference Materials and Method Validation for Advancing Research on the Health Effects of Dietary Supplements and Other Natural Products

Artificial Intelligence Based Optimization for the Se(IV) Removal from Aqueous Solution by Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron Composites

Vanadium Species-Assisted Photochemical Vapor Generation for Direct Detection of Trace Tellurium with Inductively Coupled Plasma Mass Spectrometry

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