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Effect of Hydroxyl Groups and Rigid Structure in 1,4-Cyclohexanediol on Percutaneous Absorption of Metronidazole

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Abstract

In a previous study, a synergistic retardation effect of 1,4-cyclohexanediol and 1,2-hexanediol on percutaneous absorption and penetration of metronidazole (MTZ) was discovered. A complex formation between 1,4-cyclohexanediol and 1,2-hexanediol was proposed to be responsible for the observed effect. The objective of this study was to investigate the necessity of hydroxyl group and the ring structure in 1,4-cyclohexanediol on percutaneous absorption and penetration of MTZ. Eleven formulations were studied in an in vitro porcine skin model using glass vertical Frans Diffusion Cell. 1,4-Cyclohexanediol was changed into 1,4-cyclohexanedicarboxylic acid, trans (and cis)-1,2-cyclohexanediol and 1,6-hexanediol, respectively, to study if H-bonding or ring structure would influence the retardation effect. MTZ was applied at infinite dose (100 mg), which corresponded to 750 μg of MTZ. Based on modifier ratios (MR) calculated by the flux values, the retardation effect on percutaneous absorption and penetration of MTZ was found in the formulations containing 1,4-cyclohexanedicarboxylic acid or cis-1,2-cyclohexanediol (MR values were 0.47 for which only contains 1,4-cyclohexanedicarboxylic acid, 0.74 for the formulation containing both 1,4-cyclohexanedicarboxylic acid and 1,2-hexanediol, and 0.90 for the formulation containing cis-1,2-cyclohexanediol and 1,2-hexanediol, respectively). The results showed that the hydroxyl group and structure of 1,4-cyclohexanediol played a significant role in retardation effects and provided valuable insight on the mechanisms of retardation effect through structure–activity relationships.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Drug Delivery and High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, 300072, Tianjin, People’s Republic of China

    Yan Zhang, Fengping Tan, Weipu Jia, Nan Li & Jerry Zhang

  2. Zyleris PharmaTech, 11 N. Skokie Hwy, Suite G-16, Lake Bluff, Illinois, 60044, USA

    Jerry Zhang

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  1. Yan Zhang
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  2. Fengping Tan
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  3. Weipu Jia
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  4. Nan Li
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  5. Jerry Zhang
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Correspondence to Nan Li or Jerry Zhang.

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Zhang, Y., Tan, F., Jia, W. et al. Effect of Hydroxyl Groups and Rigid Structure in 1,4-Cyclohexanediol on Percutaneous Absorption of Metronidazole. AAPS PharmSciTech 15, 973–980 (2014). https://doi.org/10.1208/s12249-014-0125-8

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  • DOI: https://doi.org/10.1208/s12249-014-0125-8

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