Heavy Metal Contents of St. John’s wort (Hypericum perforatum L.) Growing in Northern Turkey

Ayan, Alı Kemal; Kizilkaya, Rıdvan; Çırak, Cüneyt; Kevseroğlu, Kudret

doi:10.3923/jps.2006.182.186

Cited by 9 publications

(9 citation statements)

References 12 publications

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“…It corresponds to the R ÷ 1.1-3.8. The increase of R to 14.1 was detected in work [48] only. Such an increase corresponds to the expansion of the concentration range to 12.9-181.6 μg/g.…”

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 79%

“…Such an increase corresponds to the expansion of the concentration range to 12.9-181.6 μg/g. Among 35 samples in [48], the Zn concentration exceeded 100 μg/g in 7 plants only. The increase in Zn concentration above 50-100 μg/g is not typical for most observations.…”

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 93%

“…These papers account for 72 samples from the studied 136 probes. More precisely, the iron content exceeded 80 μg/g in 43 plants [46,48], while the results of individual measurements are not shown in [45]. In all 18 samples reported in [49,52], the Fe concentration exceeded 80 μg/g despite the moderate value of R. Totally, high iron content was observed in almost half of the studied samples (at least 61 out of 136).…”

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 96%

“…The increase in Zn concentration above 50-100 μg/g is not typical for most observations. The influence of external environmental pollution may take place in these few samples described in [48].…”

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 99%

“…The parameter R varies from 1.1 to 5.5, which corresponds to a concentration range of about 20-80 μg/g. Meanwhile, many observations with elevated R are known from the literature [45,46,48]. These papers account for 72 samples from the studied 136 probes.…”

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 99%

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Chemistry of medicinal plants as an integral part of ecological education

Derkach

Tarasenko

2021

E3S Web Conf.

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The degree of variability in the composition of herbal medicines was studied on the example of the preparation of St. John's wort from various Ukrainian producers. The Cu and Zn contents were the most stable compared to other (Fe, Mn, Co, Cr, Ni, Pb, Cd) microelements among plants of different origins. The content of toxic elements (Pb, Cd) did not exceed the established standards. Meanwhile, a 2-3-fold concentration difference was observed for hyperforin, an active pharmaceutical ingredient in St. John’s wort. Thus, the existing standards do not ensure the stability of the composition of herbal preparations. As a result, the quality of medicinal drugs can be significantly different. The key reason for the variation in plant composition is environmental influence, including anthropogenic factors. Existing training programs for prospective specialists of the pharmaceutical industry do not pay enough attention to the impact of the environment on the quality of herbal raw materials. Necessary changes to the syllabi of relevant disciplines are formulated to eliminate this shortcoming and ensure sustainable development of raw materials sources for the pharmaceutical industry.

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“…It corresponds to the R ÷ 1.1-3.8. The increase of R to 14.1 was detected in work [48] only. Such an increase corresponds to the expansion of the concentration range to 12.9-181.6 μg/g.…”

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 79%

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 93%

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 96%

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 99%

Section: Variability Of the Composition Of Medicinal Plantsmentioning

confidence: 99%

See 3 more Smart Citations

Chemistry of medicinal plants as an integral part of ecological education

Derkach

Tarasenko

2021

E3S Web Conf.

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Bioaccumulation of Heavy Metals by Herbaceous Species Grown in Urban and Rural Sites

Pietrelli

Menegoni

Papetti

2022

Water Air Soil Pollut

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Toxic Element Profiles in Selected Medicinal Plants Growing on Serpentines in Bulgaria

Pavlova

Karadjova

2013

Biol Trace Elem Res

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Populations of medicinal plants growing on serpentines and their respective soils were analyzed for Fe, Ni, Mn, Cr, Co, Cd, Cu, Zn, and Pb using inductively coupled plasma atomic emission spectrometry. Aqua regia extraction and 0.43 M acetic acid extraction were used for the quantification of pseudototal and bioavailable fractions, respectively, of elements in soil and nitric acid digestion for determination of total element content in plants. Screening was performed to (1) document levels of toxic metals in herbs extensively used in preparation of products and standardized extracts, (2) compare accumulation abilities of ferns and seed plants, and (3) estimate correlations between metal content in plants and their soils. The toxic element content of plants varied from site to site on a large scale. The concentrations of Fe and Ni were elevated while those of Cu, Zn, and Pb were close to average values usually found in plants. The highest concentrations for almost all elements were measured in both Teucrium species. Specific differences in metal accumulation between ferns and seed plants were not recorded. The investigated species are not hyperaccumulators but can accumulate toxic elements, in some cases exceeding permissible levels proposed by the World Health Organization and European Pharmacopoeia. The harvesting of medicinal plants from serpentines could be hazardous to humans.

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Heavy Metal Contents of St. John’s wort (Hypericum perforatum L.) Growing in Northern Turkey

Cited by 9 publications

References 12 publications

Chemistry of medicinal plants as an integral part of ecological education

Chemistry of medicinal plants as an integral part of ecological education

Bioaccumulation of Heavy Metals by Herbaceous Species Grown in Urban and Rural Sites

Toxic Element Profiles in Selected Medicinal Plants Growing on Serpentines in Bulgaria

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