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Reviews on Environmental Health

Editor-in-Chief: Carpenter, David O. / Sly, Peter

Editorial Board: Brugge, Doug / Edwards, John W. / Field, R.William / Garbisu, Carlos / Hales, Simon / Horowitz, Michal / Lawrence, Roderick / Maibach, H.I. / Shaw, Susan / Tao, Shu / Tchounwou, Paul B.


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2191-0308
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Volume 30, Issue 1

Issues

Toenail as a biomarker of heavy metal exposure via drinking water: a systematic review

Nurul Hafiza Ab Razak
  • Faculty of Medicine and Health Sciences, Department of Environmental and Occupational Health, Universiti Putra Malaysia, Selangor Darul Ehsan, Malaysia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Sarva Mangala Praveena
  • Corresponding author
  • Faculty of Medicine and Health Sciences, Department of Environmental and Occupational Health, Universiti Putra Malaysia, Selangor Darul Ehsan, Malaysia
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Zailina Hashim
  • Faculty of Medicine and Health Sciences, Department of Environmental and Occupational Health, Universiti Putra Malaysia, Selangor Darul Ehsan, Malaysia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2014-10-21 | DOI: https://doi.org/10.1515/reveh-2014-0063

Abstract

Toenail is metabolic end product of the skin, which can provide information about heavy metal accumulation in human cells. Slow growth rates of toenail can represent heavy metal exposure from 2 to 12 months before the clipping. The toenail is a non-invasive biomarker that is easy to collect and store and is stable over time. In this systematic review, the suitability of toenail as a long-term biomarker was reviewed, along with the analysis and validation of toenail and confounders to heavy metal. This systematic review has included 30 articles chosen from a total of 132 articles searched from online electronic databases like Pubmed, Proquest, Science Direct, and SCOPUS. Keywords used in the search included “toenail”, “biomarker”, “heavy metal”, and “drinking water”. Heavy metal in toenail can be accurately analyzed using an ICP-MS instrument. The validation of toenail heavy metal concentration data is very crucial; however, the Certified Reference Material (CRM) for toenail is still unavailable. Usually, CRM for hair is used in toenail studies. Confounders that have major effects on heavy metal accumulation in toenail are dietary intake of food and supplement, smoking habit, and overall health condition. This review has identified the advantages and limitations of using toenail as a biomarker for long-term exposure, which can help future researchers design a study on heavy metal exposure using toenail.

Keywords: confounders; drinking water; heavy metal; toenail

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About the article

Corresponding author: Sarva Mangala Praveena, Faculty of Medicine and Health Sciences, Department of Environmental and Occupational Health, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia, Phone: +603-89472692, Fax: +603-89472395, E-mail:


Received: 2014-08-21

Accepted: 2014-09-26

Published Online: 2014-10-21

Published in Print: 2015-03-01


Citation Information: Reviews on Environmental Health, Volume 30, Issue 1, Pages 1–7, ISSN (Online) 2191-0308, ISSN (Print) 0048-7554, DOI: https://doi.org/10.1515/reveh-2014-0063.

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