A pencil-lead bismuth film electrode and chemometric tools for simultaneous determination of heavy metals in propolis samples

Pierini, Gastón Darío; Pistonesi, Marcelo Fabián; Nezio, María Susana Di; Centurión, María Eugenia

doi:10.1016/j.microc.2015.11.038

Cited by 34 publications

(14 citation statements)

References 28 publications

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“…The reaction conditions used here are not optimal for porphyrin metallation by other common metals in biology, such as Fe(II or III), Mn(II), Co(II or III), Ni(II), because of either inadequate pH or reaction time, or lack of appropriate catalyst . Metallation of H 2 TCPP 4− with Cu 2+ under the proposed conditions cannot be completely ruled out, but Cu 2+ concentration in propolis is lower than that of Zn 2+ . It is worth noting, however, that even in the event of H 2 TCPP 4− metallation with Mn(II), Fe(II or III), Co(II or III), Ni(II), Cu(II), or other non‐ d 10 metals, the corresponding metalloporphyrin complexes would be non‐fluorescent, imposing a high selectivity to Zn 2+ determination.…”

Section: Resultsmentioning

confidence: 89%

“…Zinc is the second most abundant transition metal usually found in raw propolis, in concentrations ranging from 10 to 200 mg/kg and being surpassed only by iron, which is found in at least 10‐fold higher concentration than that of zinc. Samples of raw propolis containing unusually high Zn concentrations of 1364 or 9325 mg/kg have been reported . Whereas zinc plays multiple roles in cell biology and is an essential element for a wide variety of living beings, including humans and microorganisms, there has been a great deal of efforts lately to develop Zn‐based complexes as antimicrobial agents and cancer experimental therapeutics.…”

Section: Introductionmentioning

confidence: 99%

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A porphyrin‐based fluorescence method for zinc determination in commercial propolis extracts without sample pretreatment

et al. 2017

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The quantification of zinc in over-the-counter drugs as commercial propolis extracts by molecular fluorescence technique using meso-tetrakis(4-carboxyphenyl)porphyrin (H TCPP ) was developed for the first time. The calibration curve is linear from 6.60 to 100 nmol L of Zn . The detection and quantification limits were 6.22 nmol L and 19.0 nmol L , respectively. The reproducibility and repeatability calculated as the percentage variation of slopes of seven calibration curves were 6.75% and 4.61%, respectively. Commercial propolis extract samples from four Brazilian states were analyzed and the results (0.329-0.797 mg/100 mL) obtained with this method are in good agreement with that obtained with the Atomic Absorption Spectroscopy (AAS) technique. The method is simple, fast, of low cost and allows the analysis of the samples without pretreatment. Moreover the major advantage is that Zn-porphyrin complex presents fluorescent characteristic promoting the selectivity and sensitivity of the method.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

A porphyrin‐based fluorescence method for zinc determination in commercial propolis extracts without sample pretreatment

et al. 2017

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“…Due to these peculiarities, Bi has motivated much interest in condensed matter research and also a significant number of applications, especially in the form of films. It has been used to test several quantum confinement phenomena [3][4][5][6][7], and among the applications of Bi films are magnetic field and current sensing [1,5,8], electrochromic and fotovoltaic devices [9][10][11][12], thermoelectric devices [13], and electrodes for a variety of appliances [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and electrical transport in electrodeposited Bi films

Moral‐Vico

Camón

Pobes

et al. 2019

Journal of Electroanalytical Chemistry

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The semimetal character of bismuth and its large photon absorbing power make of this element the most suitable absorber material for X-ray low temperature detectors. This application requires coatings of Bi with thicknesses and properties that only electrodeposition methods may achieve.Although there are studies on electrodeposition of bismuth for these detectors and other devices, the process is not straightforward and has not been sufficiently studied in terms of the desired final properties, neither the effect of different parameters is well known or easily reproduced. This work reports the influence of two different electrolytes, of the deposition method, and of heating and stirring on the structure, microstructure and transport properties of bismuth films. Typically, rhombohedral Bi is obtained upon electrodeposition with very good crystallinity, and some crystal preferential orientation, while significant empirical correlations are found among electrochemical parameters, microstructure, and resistivity. Such correlation allows the identification of the deposition parameters for coatings that yield the optimal functional properties.

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“…Researchers have shown that the primary botanical sources (Baccharis dracunculifolia) for the production of propolis can accumulate cadmium [180], turning this plant into a possible source of contamination. Other sources of this toxic metal can be agricultural inputs, such as fungicides, used in plantations in Santa Catarina (SC) and Rio Grande do Sul (RS) [31,34,181,182], where Cd was found in pollen samples.…”

Section: Toxic Metals In Brazilian and Mexican Propolismentioning

confidence: 99%

Comparison of the Biological Potential and Chemical Composition of Brazilian and Mexican Propolis

et al. 2021

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Propolis is a resinous substance collected by bees from plants and its natural product is available as a safe therapeutic option easily administered orally and readily available as a natural supplement and functional food. In this work, we review the most recent scientific evidence involving propolis from two countries (Brazil and Mexico) located in different hemispheres and with varied biomes. Brazil has a scientifically well documented classification of different types of propolis. Although propolis from Brazil and Mexico present varied compositions, they share compounds with recognized biological activities in different extraction processes. Gram-negative bacteria growth is inhibited with lower concentrations of different types of propolis extracts, regardless of origin. Prominent biological activities against cancer cells and fungi were verified in the different types of extracts evaluated. Antiprotozoal activity needs to be further evaluated for propolis of both origins. Regarding the contamination of propolis (e.g., pesticides, toxic metals), few studies have been carried out. However, there is evidence of chemical contamination in propolis by anthropological action. Studies demonstrate the versatility of using propolis in its different forms (extracts, products, etc.), but several potential applications that might improve the value of Brazilian and Mexican propolis should still be investigated.

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A pencil-lead bismuth film electrode and chemometric tools for simultaneous determination of heavy metals in propolis samples

Cited by 34 publications

References 28 publications

A porphyrin‐based fluorescence method for zinc determination in commercial propolis extracts without sample pretreatment

A porphyrin‐based fluorescence method for zinc determination in commercial propolis extracts without sample pretreatment

Microstructure and electrical transport in electrodeposited Bi films

Comparison of the Biological Potential and Chemical Composition of Brazilian and Mexican Propolis

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