Speciation of chromium and vanadium in medicinal plants

M, Owolabi I A; Mandiwana, Khakhathi L.; Panichev, Nikolay

doi:10.17159/0379-4350/2016/v69a8

Cited by 16 publications

(8 citation statements)

References 13 publications

(9 reference statements)

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“…This may be the result of contamination during the harvesting and processing of medicinal plants as well as contamination of the raw materials used in manufacturing. Owolabi et al [54]and Adhikari et al [55] reported high levels of chromium in medicinal plant from South African. Cr exposure can cause dermatitis, respiratory tract issues, lung cancer, and permanent nose damage [29].…”

Section: Resultsmentioning

confidence: 99%

Investigation of heavy metal analysis on medicinal plants used for the treatment of skin cancer by traditional practitioners in Pretoria

Oluwaseun

Kopaopa

Mugivhisa

et al. 2023

Preprint

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The use of medicinal plants for the treatment of diseases, including cancer, is acknowledged and accepted in many African nations. Heavy metal contamination of plant materials poses a potential health risk, particularly for populations that are already vulnerable. This study determine the levels of heavy metals in medicinal plant samples used for treatment of skin cancer and evaluate the health risk caused by heavy metals to the adult population in Pretoria, South Africa using inductively coupled plasma mass spectrometry (ICP-MS). The concentrations of metals were as follows; As (< 0.2–1.04 ± 0.026), Cd (0.02 ± 0.00026–0.167 ± 0.006), Pb (0.38 ± 0.01–2.27 ± 0.05), Cr (5.31 ± 0.21– 26.9 ± 3.96) mg/kg and Hg which were lesser than 0.02 mg/kg. The mean concentrations of all analyzed heavy metals are above permissible limit except for Hg which are lower than the permissible limit. The Hazard Quotient (THQ) was less than 1 for all the heavy metals, suggesting that there is no obvious non-carcinogenic health risks associated with the consumption of these medicinal plants for now even though the prolonged use may result in health risks. The ingestion route was identified as the primary contributor to the overall risk by the health index (HI) values in the present study were more than 1, indicating that the combined effects of the heavy metal contaminants present in a particular herbal preparation pose health risk in the long term. Our findings support the need for close monitoring of potential heavy metals concentrations in medicinal plants given to patients from herbal shops.

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Section: Resultsmentioning

confidence: 99%

Investigation of heavy metal analysis on medicinal plants used for the treatment of skin cancer by traditional practitioners in Pretoria

Oluwaseun

Kopaopa

Mugivhisa

et al. 2023

Preprint

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“…However, no improvement was achieved, possibly indicative of a small interconversion of the species. However, only with minor variations (vortex agitation and development time), this methodology proposed by Panichev and colleagues [14,15], proves to be more efficient than all others tested. Additionally, in accordance with U.S. Food and Drug Administration guidelines [22], recoveries of 86% and 80%, for the extraction of soluble and insoluble species in the presence of the Cr2O3 pigment matrix are considered acceptable.…”

Section: Recovery Yield For Soluble and Insoluble Cr(vi) Speciesmentioning

confidence: 87%

“…Thereafter, the sample was centrifuged at 4000 rpm for 20 min and filtered through a 0.45 μm filter. The pH was adjusted to 2.0 ± 0.5 by addition of 3 mol L -1 H2SO4 and diluted to a final volume of 25 mL with high-purity water and homogenized [14,15]. Blank solutions of the same medium were run in parallel and their absorbance was taken into consideration.…”

Section: Procedures VI -Na2co3 Based Extractionmentioning

confidence: 99%

“…Spectrophotometry remains a widely used method for detection of Cr(VI) in water, soils, sludges, sediments, and similar solid waste samples based on its complexation with 1,5-diphenylcarbazide (DPC) because of its simplicity, speed and low cost while meeting the required legislated limits of 1 µg g -1 [3,[7][8][9]. However, different sample pre-treatment options for solid samples are noted in the literature [9][10][11][12][13][14][15]. EPA method 3060A is most often recommended for determination of Cr(VI) in solid environmental matrices and is based on an alkaline extraction [9].…”

Section: Introductionmentioning

confidence: 99%

“…Bruzzoniti and coauthors [11] compared three different methods for extraction of Cr(VI): EPA method 3060A, IRSA16 (Istituto di Ricerca Sulle Acque: cromo esavalente) [12] and use of Na3PO4 [13] for determination of Cr/Cr(VI), Ni and Co in cosmetic matrices (pearly pigment, black iron oxide, pearly powder and eye shadow samples) using ion chromatography [9,[11][12][13]. Owolabi and coauthors [14] simply leached Cr(VI) and V(V) from medicinal plants with a 0.10 mmol solution of Na2CO3 prior to determination by electrothermal atomic absorption spectrometry whereas Mathebula and coauthors [15] employed the same extraction approach for the leaching of Cr(VI) from bread and breakfast cereals for further determination by high resolution continuum source absorption spectrometry (HR-CS AAS) [14,15]. Due to the high risk of contamination by Cr(VI) when GRAPHICAL ABSTRACT using Cr2O3 pigment as a colorant in cosmetic products, it is important to determine the presence of this extremely toxic contaminant.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Sample Preparation Procedures for Determination of Cr(VI) in Cr2O3 Pigments by Vis Spectrophotometry

Santos

Sabatke

Herrmann

et al. 2021

Braz. arch. biol. technol.

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Six sample preparation procedures were evaluated for selective extraction of Cr(VI) from commercial samples of chromium oxide green (Cr2O3) pigments prior to formation of its diphenylcarbazone complex [CrDPCO]for determination by visible spectrophotometry: (I) water-soluble chromium; (II) EPA method 3060A without Mg 2+ ; (III) EPA method 3060A with Mg 2+ ; (IV) Na3PO4 based extraction; (V) method IRSA16 based on acidic extraction and; (VI) Na2CO3 based extraction. Evaluation of the influence of concomitant Cr(III) ions, time and stability of the [CrDPCO]complex was investigated. Recoveries of soluble and insoluble Cr(VI) species were 86% and 80%, respectively, using procedure (VI). Direct calibration against aqueous standards prepared in the extraction medium was successful for Cr(VI) in the concentration range 0.05-1.50 μg L -1 . Limits of detection and quantitation were 0.3 µg g -1 and 1.0 µg g -1 , respectively, for 250 mg subsamples/25 mL. Procedure (VI) was applied to the analysis of four commercial samples of Cr2O3 pigments, three determined to have Cr(VI) within compliance limits below 1.0 µg g -1 , but one at 16.6 ± 0.6 µg g -1 , prohibiting use of this pigment in cosmetic formulations. This sample was conveniently employed to evaluate the accuracy of the method. The recommended procedure is simple and accurate and has been adopted by Tecpar's laboratory of Parana Institute of Technology (Curitiba, Brazil). HIGHLIGHTS Different preparation procedures were investigated to selectively determine Cr(VI) in Cr2O3.  A robust method was developed for detection of Cr(VI) in Cr2O3 pigments for use in cosmetics products. Method validation demonstrated accuracy and precision.2 Dos Santos, E.J.; et al.

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Genetic and Environmental Influence on Macro- and Microelement Accumulation in Plants of Artemisia Species

Golubkina

Logvinenko

Молчанова

et al. 2020

Plant Micronutrients

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Speciation of chromium and vanadium in medicinal plants

Cited by 16 publications

References 13 publications

Investigation of heavy metal analysis on medicinal plants used for the treatment of skin cancer by traditional practitioners in Pretoria

Investigation of heavy metal analysis on medicinal plants used for the treatment of skin cancer by traditional practitioners in Pretoria

Evaluation of Sample Preparation Procedures for Determination of Cr(VI) in Cr2O3 Pigments by Vis Spectrophotometry

Genetic and Environmental Influence on Macro- and Microelement Accumulation in Plants of Artemisia Species

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