PMID- 28363491 OWN - NLM STAT- MEDLINE DCOM- 20180626 LR - 20180626 IS - 1879-0720 (Electronic) IS - 0928-0987 (Linking) VI - 104 DP - 2017 Jun 15 TI - Dendrimer pre-treatment enhances the skin permeation of chlorhexidine digluconate: Characterisation by in vitro percutaneous absorption studies and Time-of-Flight Secondary Ion Mass Spectrometry. PG - 90-101 LID - S0928-0987(17)30169-0 [pii] LID - 10.1016/j.ejps.2017.03.034 [doi] AB - Skin penetration and localisation of chlorhexidine digluconate (CHG) within the skin have been investigated in order to better understand and optimise the delivery using a nano polymeric delivery system of this topically-applied antimicrobial drug. Franz-type diffusion cell studies using in vitro porcine skin and tape stripping procedures were coupled with Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) to visualise the skin during various treatments with CHG and polyamidoamine dendrimers (PAMAM). Pre-treatment of the skin with PAMAM dendrimers significantly increased the amount and depth of permeation of CHG into the skin in vitro. The effect observed was not concentration dependant in the range 0.5-10mM PAMAM. This could be important in terms of the efficiency of treatment of bacterial infection in the skin. It appears that the mechanism of enhancement is due to the PAMAM dendrimer disrupting skin barrier lipid conformation or by occluding the skin surface. Franz-type diffusion cell experiments are complimented by the detailed visualisation offered by the semi-quantitative ToF-SIMS method which provides excellent benefits in terms of sensitivity and fragment ion specificity. This allows a more accurate depth profile of chlorhexidine permeation within the skin to be obtained and potentially affords the opportunity to map the co-localisation of permeants with skin structures, thus providing a greater ability to characterise skin absorption and to understand the mechanism of permeation, providing opportunities for new and more effective therapies. CI - Copyright (c) 2017. Published by Elsevier B.V. FAU - Holmes, Amy M AU - Holmes AM AD - School of Pharmacy, Keele University, Keele, Staffordshire ST5 5BG, UK. Electronic address: amy.holmes@unisa.edu.au. FAU - Scurr, David J AU - Scurr DJ AD - School of Pharmacy, University of Nottingham, Nottingham, UK. FAU - Heylings, Jon R AU - Heylings JR AD - Dermal Technology Laboratory Ltd., MedIC4, Keele University Science and Innovation Park, Keele, Staffordshire ST5 5NL, UK. FAU - Wan, Ka-Wai AU - Wan KW AD - School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, UK. FAU - Moss, Gary P AU - Moss GP AD - School of Pharmacy, Keele University, Keele, Staffordshire ST5 5BG, UK. Electronic address: g.p.j.moss@keele.ac.uk. LA - eng PT - Journal Article DEP - 20170329 PL - Netherlands TA - Eur J Pharm Sci JT - European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences JID - 9317982 RN - 0 (Dendrimers) RN - 0 (PAMAM Starburst) RN - MOR84MUD8E (chlorhexidine gluconate) RN - R4KO0DY52L (Chlorhexidine) SB - IM MH - Animals MH - Chlorhexidine/*analogs & derivatives/pharmacokinetics MH - Chromatography, High Pressure Liquid MH - Dendrimers/*administration & dosage MH - Limit of Detection MH - *Skin Absorption MH - Spectrometry, Mass, Secondary Ion/*methods MH - Swine OTO - NOTNLM OT - Chlorhexidine OT - In vitro skin diffusion OT - PAMAM dendrimer OT - Penetration enhancer OT - Tape stripping OT - Time-of-Flight Secondary Ion Mass Spectrometry EDAT- 2017/04/02 06:00 MHDA- 2018/06/27 06:00 CRDT- 2017/04/02 06:00 PHST- 2017/01/23 00:00 [received] PHST- 2017/03/14 00:00 [revised] PHST- 2017/03/24 00:00 [accepted] PHST- 2017/04/02 06:00 [pubmed] PHST- 2018/06/27 06:00 [medline] PHST- 2017/04/02 06:00 [entrez] AID - S0928-0987(17)30169-0 [pii] AID - 10.1016/j.ejps.2017.03.034 [doi] PST - ppublish SO - Eur J Pharm Sci. 2017 Jun 15;104:90-101. doi: 10.1016/j.ejps.2017.03.034. Epub 2017 Mar 29.