Multi-element analysis of vegetal foodstuff by means of low power total reflection X-ray fluorescence (TXRF) spectrometry

Dalipi, Rogerta; Marguí, Eva; Borgese, Laura; Depero, Laura E.

doi:10.1016/j.foodchem.2016.09.022

Cited by 74 publications

(49 citation statements)

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“…Several diluting agents were used for such purpose including ultrapure water, a solution of 1% Triton X-100 and a solution of 0.1% Mg(NO3)2. These reagents have been previously used in TXRF analysis to obtain homogeneous complex liquid samples and solid suspensions [12,14,20] and as chemical modifier for a proper sample deposition on the reflector [28]. In Figure 2, the effect of the sample dilution type on element concentrations and the shape of the dried residue on the quartz reflector are shown.…”

Section: Sample Treatmentmentioning

confidence: 99%

“…Another analytical possibility is the use of total reflection X-ray fluorescence spectrometry (TXRF). TXRF is a well-established analytical technique for multi element determination in various sample types, especially liquids and powdered micro samples [12][13][14]. To perform analysis under total-reflection conditions, samples must be provided as thin films.…”

Section: Introductionmentioning

confidence: 99%

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Critical evaluation of the use of total reflection X-ray fluorescence spectrometry for the analysis of whole blood samples: application to patients with thyroid gland diseases

et al. 2019

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Multielemental analysis of whole blood can provide significant information for the evaluation of nutritional status, diagnosis of certain diseases as well as for the assessment of exposure to potentially toxic metals. However, the quantification of multiple elements in whole blood is not easy partly because of the wide variation in element concentrations (from ng•L-1 to g•L-1) and the complex matrix. The aim of this work was to develop a fast, sustainable and reliable analytical method, in combination with low power TXRF, for multielemental analysis of blood samples. Firstly, a set of experiments were carried out to select the best diluent type and dilution factor using the control material SeronormTM Trace Elements Whole Blood L-1. A critical evaluation of the parameters affecting the sample deposition on the reflector was also carried out including a study of the shape and element distribution of the deposited residue on the reflector by micro X-ray fluorescence spectrometry. Using the best analytical conditions, limits of detection estimated were in the low mg•kg-1 range and similar to those obtained using more complex sample treatments such as digestion. Accuracy and precision of the results were in most cases acceptable (Recoveries: 89-102 %, RSD: 6-8%, n=5). Only underestimated values were obtained for light elements such as potassium. To prove the applicability of the method, several blood samples from control and thyroid diseases patients were analysed. Despite the fact that more samples need to be analysed, it seems that Zn and Br contents in some of the patients are significantly higher compared to control samples.

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Section: Sample Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical evaluation of the use of total reflection X-ray fluorescence spectrometry for the analysis of whole blood samples: application to patients with thyroid gland diseases

et al. 2019

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“…10 µl of the resulting solution were pipetted onto a clean quartz sample support, dried at 60 °C and analyzed for 2000 s. Detection limits were between 5 and 20 pg for this type of sample and sample preparation. TXRF can be used to analyze selected elements in food, beverages, and dietary supplements [60][61][62][63][64]. For beverages, a small quantity of the sample is often only mixed with an internal standard and analyzed directly.…”

Section: Biological and Food Applicationsmentioning

confidence: 99%

Total reflection X-ray fluorescence

Schmeling

2019

Physical Sciences Reviews

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Abstract Total reflection X-ray fluorescence (TXRF) spectrometry is a non-destructive and surface sensitive multi-element analytical method based on energy dispersive X-ray fluorescence spectrometry with detection limits in the lower picogram range. It utilizes the total reflection of the primary X-ray beam at or below the critical angle of incidence. At this angle, the fluorescence intensity is substantially enhanced for samples present as small granular residue or as thin homogenous layer deposited at the surface of a thick substrate. Generally, two types of application exist: micro- and trace-analysis as well as surface and thin-layer analysis. For micro- and trace-analysis, a small amount of the solid or liquid sample is deposited on an optically flat substrate, typically quartz or polycarbonate. The dried residue is analyzed at a fixed angle setting slightly below the critical angle. Quantification is carried out by means of internal standardization. For surface and thin-layer analysis, the surface of an optically flat substrate is scanned. Variations of the incident angle of the primary X-ray beam provide information about the type and sometimes also the amount of material present at or slightly below the surface of the substrate. Major fields of application are environmental samples, biological tissues, objects of cultural heritage, semiconductors and thin-layered materials and films.

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“…The most common methods for Cd detection in rice are atomic absorption spectroscopy (AAS), inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectrometry (ICP-OES), and so on. [6][7][8][9] These methods have achieved quick and exact detection, but they are also time-consuming, require sophisticated equipment and are very demanding for the operator, generally in a laboratory setting. Unlike other countries, China's agricultural production is dominated by scattered smallholders, which also increased a security supervision of difficulty.…”

Section: Introductionmentioning

confidence: 99%

In situ fast analysis of cadmium in rice by diluted acid extraction-anodic stripping voltammetry

et al. 2019

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Multi-element analysis of vegetal foodstuff by means of low power total reflection X-ray fluorescence (TXRF) spectrometry

Cited by 74 publications

References 32 publications

Critical evaluation of the use of total reflection X-ray fluorescence spectrometry for the analysis of whole blood samples: application to patients with thyroid gland diseases

Critical evaluation of the use of total reflection X-ray fluorescence spectrometry for the analysis of whole blood samples: application to patients with thyroid gland diseases

Total reflection X-ray fluorescence

In situ fast analysis of cadmium in rice by diluted acid extraction-anodic stripping voltammetry

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