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Pb in medicinal plants from Jordan

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Abstract

This is the first report on Pb in medicinal herbs from Jordan. Medicinal herbs may present a health risk due to the presence of toxic metals. Seventy-nine dry medicinal plant samples were collected from herbalist shops in Jordan. The plants were digested with acids and analyzed for total Pb concentration using atomic absorption spectrometry. Mean Pb concentration was 15.9 μg/g on a dry weight basis. Our results show that Pb concentrations in Jordan medicinal plants are higher than published data in other countries. The highest level of 33.4 μg Pb/g was determined in Inula viscosa, and the lowest level of 3.0 μg Pb/g was found in Nigella sativa. Calculated daily intakes of Pb of most analyzed herbs were high; most of them are higher than recommended values by the world health organization (WHO). Fortunately, the herbs that contain the highest Pb levels are the less commonly used medicinal herbs in Jordan. The mean Pb levels in the most commonly, commonly and less commonly used herbs in Jordan are 13.9, 13.1 and 16.9 μg Pb/g, respectively. The average dietary intake of Pb through a mixture of these medicinal herbs consumption, assuming 5.0 g herbs is consumed daily, is 79.5 μg Pb/day, which is higher than the maximum daily limit allowed by WHO. We conclude that most of the medicinal plants consumed in Jordan contain significant amount of Pb, and therefore, people of Jordan should not consume large amounts of these herbs.

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Authors and Affiliations

  1. Yarmouk University, Irbid, Jordan

    Ahmed Alomary, Eshraq El Jamal, Idrees Al-Momani, Abdulrahman Attiyat & Safwan Obeidat

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  1. Ahmed Alomary
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  2. Eshraq El Jamal
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  3. Idrees Al-Momani
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  4. Abdulrahman Attiyat
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  5. Safwan Obeidat
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Correspondence to Ahmed Alomary.

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Alomary, A., Jamal, E.E., Al-Momani, I. et al. Pb in medicinal plants from Jordan. Environ Chem Lett 11, 55–63 (2013). https://doi.org/10.1007/s10311-012-0378-y

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