Effect of Combined Exposure to EDTA and Zinc Pyrithione on Pyrithione Absorption in Rats
Toxicological Research 2019;35:155−160
Published online April 15, 2019;  https://doi.org/10.5487/TR.2019.35.2.155
© 2019 Korean Society of Toxicology.

Dong Sik Jung1, Guk Hwa Jung1, Eun Ho Lee1, Hye Ran Park1, Ju Hwan Kim1, Kyu-Bong Kim2, Hak Rim Kim1, and Hyung Gun Kim1

1Department of Pharmacology, College of Medicine, Dankook University, Cheonan, Korea, 2Department of Pharmacy, College of Pharmacy, Dankook University, Cheonan, Korea
Hyung Gun Kim, Department of Pharmacology, College of Medicine, Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, Chungnam 31116, Korea. E-mail: hgkimm@dankook.ac.kr
Received: February 18, 2019; Revised: March 9, 2019; Accepted: March 10, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract

Zinc pyrithione (ZnPT) is a coordination complex of zinc and has been used widely as an anti-dandruff agent in shampoos. Many shampoos contain both ZnPT and EDTA, a chelating agent speculated to increase ZnPT absorption, thereby raising concerns about neurotoxicity. Here, we investigated the effect of EDTA on ZnPT absorption by direct comparison of ZnPT and pyrithione (PT) concentrations in shampoo formulations, and by pharmacokinetic analysis of ZnPT, PT, and 2-methanesulfonylpyridine (MSP), the main ZnPT metabolite, in rat plasma or urine following exposure to shampoo containing ZnPT alone or a combination of ZnPT and EDTA. Approximately 17.3% of ZnPT was converted to PT by the addition of EDTA in the shampoo formulation. Plasma ZnPT and PT concentrations were not measured up to 24 hr after treatment with shampoo containing 1% ZnPT or 1% ZnPT + 2% EDTA in all rats. However, PT amount in 24-hr urine sample, MSP concentration in plasma, and MSP amount in 24-hr urine sample were approximately 4-, 2.6-, and 2.7-fold higher, respectively, in the 1% ZnPT + 2% EDTA shampoo group than in the 1% ZnPT shampoo group. As confirmed by the formulation analysis and in vivo pharmacokinetic analysis, the exposure of ZnPT could be increased by the absorption of PT due to partial dissociation of ZnPT into PT.

Keywords : Zinc pyrithione, Pyrithione, Pharmacokinetic, Shampoo


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