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Modelling transdermal drug delivery using microneedles: effect of geometry on drug transport behaviour

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journal contribution
posted on 22.12.2014 by Ololade Olatunji, Diganta Das, Vahid Nassehi
Transdermal drug delivery using microneedles (MNs) depends on the rate of drug transport through the viable epidermis. Therefore, minimising the distance between the drug-loaded surface and the microcirculation in the dermis where the drug is absorbed into the body is significant in improving drug delivery efficiency. A quantifiable relationship between MN design parameters and skin diffusion properties is therefore desirable, which is what this study aims to achieve. A framework is presented to quantitatively determine the effects of design parameters on drug diffusion through skin, where the effects of compressive strain on skin due to insertion of MN are considered. The model is then used to analyse scenarios of practical importance. For all scenarios analysed, predicted steady-state flux was found to be lower when effect of MN strain on diffusion coefficient was accounted for. For example, simulations results indicated increasing tip radius from 5 to 20 μm and flux increased from 6.56 × 10 to 7.02 × 10 mol/(m s) for constant diffusion coefficient. However, if the effect of strain on diffusion coefficient is considered, the calculated flux increases from 5.30 × 10 to a peak value of 5.32 × 10 mol/(m s) (at 10 μm) and decreases to 5.29 × 10 mol/(m s). This paper contributes by reporting a framework to relate MN geometry to permeability with inclusion of the possible effects the MN design may pose on the diffusion coefficient. © 2011 Wiley Periodicals, Inc. and the American Pharmacists Association.

Funding

The authors gratefully acknowledge an Engineering and Physical Sciences Research Council, UK, studentship towards this PhD research.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Journal of Pharmaceutical Sciences

Volume

101

Issue

1

Pages

164 - 175

Citation

OLATUNJI, O., DAS, D.B. and NASSEHI, V., 2012. Modelling transdermal drug delivery using microneedles: effect of geometry on drug transport behaviour. Journal of Pharmaceutical Sciences, 101 (1), pp. 164 - 175.

Publisher

© Wiley Periodicals, Inc. and the American Pharmacists Association

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2012

Notes

This is the accepted version of the following article: OLATUNJI, O., DAS, D.B. and NASSEHI, V., 2012. Modelling transdermal drug delivery using microneedles: effect of geometry on drug transport behaviour. Journal of Pharmaceutical Sciences, 101 (1), pp. 164-175, which has been published in final form at: http://dx.doi.org/10.1002/jps.22736

ISSN

0022-3549

eISSN

1520-6017

Language

en

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