Quantification of Fluoride in Food by Microwave Acid Digestion and Fluoride Ion-Selective Electrode

Rocha, R.A.; Rojas, Dayana; Clemente, María Jesús; Ruiz, Antonio José Ortiz; Devesa, Vicenta; Vélez, Dinoraz

doi:10.1021/jf403728r

Cited by 45 publications

(22 citation statements)

References 25 publications

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“…This lack of attention probably depends on the fact that fluoride ion is not routinely analyzed by the organizations responsible for food safety and health because of a number of analytical difficulties associated with its reliable quantification in foodstuffs (Rocha et al, 2013). Moreover, a careful analysis of the scarce literature concerning this aim allows us to conclude that a reliable and validated method devoted to the measure of the level of free fluoride ions in honey samples is at the moment absent.…”

Section: Methods Assessmentmentioning

confidence: 99%

Free fluoride determination in honey by ion-specific electrode potentiometry: Method assessment, validation and application to real unifloral samples

Spano

Guccini

Ciulu

et al. 2018

Arabian Journal of Chemistry

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Surprisingly, a reliable method for measuring the concentration of free fluoride ions in honey is still missing from the literature, notwithstanding the generally recognized importance of the analyte and the matrix. To fill this gap, this study proposes and validates a straightforward ion-specific electrode potentiometric method for this task. The method offers very low detection and quantification limits (6.7 lg kg À1 and 25 lg kg À1 , respectively), good linearity (R 2 > 0.994), good sensitivity (typically 55 ± 3 mV for an order of magnitude of concentration) in an unusually low concentration interval (between 0.020 and 1 mg L À1 ), and acceptable precision and bias. The method was applied to 30 unifloral (thistle, eucalyptus and strawberry tree) honey samples from Sardinia, Italy. The amount of free fluoride ions found in these honeys appears to be lower than Abbreviations: FISE, fluoride ion-selective electrode; TISAB, total ionic strength adjusting buffer; EDTA, ethylenediaminetetraacetic acid disodium salt; CDTA, 2-[2-[bis(2-hydroxy-2-oxoethyl)amino]cyclohexyl]-(2-hydroxy-2-oxoethyl)aminoethanoic acid; EC, external calibration method; MSA, multiple standard additions method; CRM, certified reference material; LOD, limit of detection; LOQ, limit of quantification * Corresponding author.

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Section: Methods Assessmentmentioning

confidence: 99%

Free fluoride determination in honey by ion-specific electrode potentiometry: Method assessment, validation and application to real unifloral samples

Spano

Guccini

Ciulu

et al. 2018

Arabian Journal of Chemistry

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“…10 The sensitive fluoride ions assays are usually performed with a wealth of established techniques including ion chromatography, 19 FNMR, fluoride ions selective electrodes and fluorescence capillary electrophoresis. [11][12][13][14] As these analyses are expensive, timeconsuming, and require tedious sample pretreatments and enrichments, and thus there exists a great demand to develop an ultrasensitive, simple, rapid and reliable assay of fluoride ions for improving drinking water safety and environmental protection.…”

Section: Introductionmentioning

confidence: 99%

A silica-based SERS chip for rapid and ultrasensitive detection of fluoride ions triggered by a cyclic boronate ester cleavage reaction

Zhang

Chen

et al. 2017

Nanoscale

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Chemical sensing for the convenient detection of trace aqueous fluoride ions (F) has been widely explored with the use of various sensing materials and techniques. It still remains a challenge to achieve ultrasensitive but simple, rapid, and inexpensive detection of F for environmental monitoring and protection. Here we reported a novel surface-enhanced Raman scattering (SERS) nanosensor, fluorescein phenylboronic acid covalently linked to 1,4-dimercapto-2,3-butanediol modified Au@Ag NPs by a cyclic boronate ester (Flu-PBA-Diol-Au@Ag NPs), for the rapid and ultrasensitive detection of F. Once the Flu-PBA approached the surface of Au@Ag NPs, the Raman signals of Flu-PBA were remarkably enhanced due to the strong SERS effect. However, the presence of F will induce the cleavage reaction of the cyclic boronate ester into the trifluoroborate anion (3F-Flu-PBA) and diol. The 3F-Flu-PBA molecules exfoliated from the surface of Au@Ag NPs, and the SERS signals of the nanosensor were quenched. Following the sensing mechanism, a silica-based SERS chip has been fabricated by the assembly of Flu-PBA-Diol-Au@Ag NPs on a piece of silicon wafer. The silica-based SERS chips showed high sensitivity for aqueous F, and the limit of detection (LOD) could reach as low as 0.1 nM. Each test using the SERS chip only needs a droplet of 20 μL sample and is accomplished within ∼10 min. The silica-based SERS chip has also been applied to the quantification of F in tap water and lake water.

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“…The limit of detection (0.130 mg / kg), accuracy (92%), recovery (84-101%) and sensitivity (1-8%) were determined. These analytical properties are satisfactory and have demonstrated the suitability of the fluoride analysis method in various types of foods [9].…”

Section: Original Research Articlementioning

confidence: 72%

Determination of Iodide and Fluoride in Brassica Oleraceae Var. Acephale with Ion Selective Electrodes

Kalaycı

2020

CJAST

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Black dandelion is widely grown in the Black Sea region, consumption as food is quite high. There are many trace elements important in terms of nutritional value. Goitre disease, which is common in this region, is caused by iodide deficiency. Fluoride is of great importance for the health of the teeth. Therefore, in our study, we wanted to measure the iodide and fluoride found in the most consumed dandelions in this region with iodide and fluoride selective electrodes. The black cabbage samples were dried to constant weighing. It was made soluble by wet burning method. Iodide and fluoride ions were determined by dilution. Our electrode consisting of ion exchange, PVC and plasticizer has a sensitivity of 59 mV to 10-5 - 10-1 M iodide. Our electrode, which is composed of calcium fluoride and less soluble silver salts, shows a sensitivity of 28 mV to 10-5 - 10-1 M fluoride. Iodide and fluoride measurements can be made with our electrodes which are not sensitive to any other anion and cation.

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Quantification of Fluoride in Food by Microwave Acid Digestion and Fluoride Ion-Selective Electrode

Cited by 45 publications

References 25 publications

Free fluoride determination in honey by ion-specific electrode potentiometry: Method assessment, validation and application to real unifloral samples

Free fluoride determination in honey by ion-specific electrode potentiometry: Method assessment, validation and application to real unifloral samples

A silica-based SERS chip for rapid and ultrasensitive detection of fluoride ions triggered by a cyclic boronate ester cleavage reaction

Determination of Iodide and Fluoride in Brassica Oleraceae Var. Acephale with Ion Selective Electrodes

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