{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T02:32:26Z","timestamp":1790217146355,"version":"4.1.0"},"reference-count":28,"publisher":"S. Karger AG","issue":"1","license":[{"start":{"date-parts":[[2011,8,17]],"date-time":"2011-08-17T00:00:00Z","timestamp":1313539200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.karger.com\/Services\/SiteLicenses"},{"start":{"date-parts":[[2011,8,17]],"date-time":"2011-08-17T00:00:00Z","timestamp":1313539200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.karger.com\/Services\/SiteLicenses"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Skin Pharmacol Physiol"],"published-print":{"date-parts":[[2012]]},"abstract":"<jats:p>Microdialysis (MD) in the skin \u2013 dermal microdialysis (DMD) \u2013 is a unique technique for sampling of topically as well as systemically administered drugs at the site of action, e.g. sampling of dermatological drug concentrations in the dermis. Debate has concerned the existence of a correlation between the depth of the sampling device \u2013 the probe \u2013 in the dermis and the amount of drug sampled following topical drug administration. This study evaluates the relation between probe depth and drug sampling using dermal DMD sampling ex vivo in human skin. We used superficial (&lt;1 mm), intermediate (1\u20132 mm) and deep (&gt;2 mm) positioning of the linear MD probe in the dermis of human abdominal skin, followed by topical application of 4 mg\/ml of benzoic acid (BA) in skin chambers overlying the probes. Dialysate was sampled every hour for 12 h and analysed for BA content by high-performance liquid chromatography. Probe depth was measured by 20-MHz ultrasound scanning. The area under the time-versus-concentration curve (AUC) describes the drug exposure in the tissue during the experiment and is a relevant parameter to compare for the 3 dermal probe depths investigated. The AUC&lt;sub&gt;0\u201312&lt;\/sub&gt; were: superficial probes: 3,335 \u00b1 1,094 \u00b5g\u00b7h\/ml (mean \u00b1 SD); intermediate probes: 2,178 \u00b1 1,068 \u00b5g\u00b7h\/ml, and deep probes: 1,159 \u00b1 306 \u00b5g\u00b7h\/ml. AUC&lt;sub&gt;0\u201312&lt;\/sub&gt; sampled by the superficial probes was significantly higher than that of samples from the intermediate and deeply positioned probes (p value &lt;0.05). There was a significant inverse correlation between probe depth and AUC&lt;sub&gt;0\u201312&lt;\/sub&gt; sampled by the same probe (p value &lt;0.001, r&lt;sup&gt;2&lt;\/sup&gt; value = 0.5). The mean extrapolated lag-times (\u00b1SD) for the superficial probes were 0.8 \u00b1 0.1 h, for the intermediate probes 1.7 \u00b1 0.5 h, and for the deep probes 2.7 \u00b1 0.5 h, which were all significantly different from each other (p value &lt;0.05). In conclusion, this paper demonstrates that there is an inverse relationship between the depth of the probe in the dermis and the amount of drug sampled following topical penetration ex vivo. The result is of relevance to the in vivo situation, and it can be predicted that the differences in sampling at different probe depths will have a more significant impact in the beginning of a study or in studies of short duration. Based on this study it can be recommended that studies of topical drug penetration using DMD sampling should include measurements of probe depth and that efforts should be made to minimize probe depth variability.<\/jats:p>","DOI":"10.1159\/000330491","type":"journal-article","created":{"date-parts":[[2011,8,17]],"date-time":"2011-08-17T06:19:16Z","timestamp":1313561956000},"page":"9-16","source":"Crossref","is-referenced-by-count":22,"title":["Probe Depth Matters in Dermal Microdialysis Sampling of Benzoic Acid after Topical Application: An ex vivo Study in Human Skin"],"prefix":"10.1159","volume":"25","author":[{"given":"R.","family":"Holmgaard","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E.","family":"Benfeldt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N.","family":"Bangsgaard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.A.","family":"Sorensen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Brosen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.","family":"Nielsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.B.","family":"Nielsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"127","published-online":{"date-parts":[[2011,8,17]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1111%2F1523-1747.ep12533356"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1002%2Fjps.2600740117"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1111%2Fj.1471-4159.1966.tb04265.x"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1046%2Fj.1365-2133.1999.02859.x"},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1016%2Fj.coph.2005.04.010"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1038%2Fsj.jid.5700495"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.1016%2Fj.ejps.2008.09.002"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1080%2F000155599750010210"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1023%2FA%3A1015892914649"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1208%2Fs12248-008-9010-2"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.1177%2F0091270007312152"},{"key":"ref12","doi-asserted-by":"publisher","DOI":"10.1159%2F000314698"},{"key":"ref13","doi-asserted-by":"publisher","DOI":"10.1007%2Fs00403-005-0627-z"},{"key":"ref14","doi-asserted-by":"publisher","DOI":"10.1016%2Fj.yrtph.2004.02.004"},{"key":"ref15","doi-asserted-by":"publisher","DOI":"10.1080%2F15287390802529872"},{"key":"ref16","doi-asserted-by":"publisher","DOI":"10.1159%2F000320151"},{"key":"ref17","doi-asserted-by":"publisher","DOI":"10.1007%2Fs004030050447"},{"key":"ref18","doi-asserted-by":"publisher","DOI":"10.1016%2Fj.ejps.2003.11.004"},{"key":"ref19","doi-asserted-by":"publisher","DOI":"10.1016%2F0168-3659%2895%2900063-E"},{"key":"ref20","doi-asserted-by":"publisher","DOI":"10.1016%2Fj.vaccine.2007.05.046"},{"key":"ref21","doi-asserted-by":"publisher","DOI":"10.1111%2Fj.1600-0536.2008.01348.x"},{"key":"ref22","doi-asserted-by":"publisher","DOI":"10.1046%2Fj.1600-0773.2003.pto930508.x"},{"key":"ref23","doi-asserted-by":"publisher","DOI":"10.1016%2Fj.ijpharm.2005.09.020"},{"key":"ref24","doi-asserted-by":"publisher","DOI":"10.1159%2F000314995"},{"key":"ref25","doi-asserted-by":"publisher","DOI":"10.1016%2F0301-0082%2890%2990027-E"},{"key":"ref26","doi-asserted-by":"publisher","DOI":"10.1016%2F0165-6147%2896%2940002-5"},{"key":"ref27","doi-asserted-by":"publisher","DOI":"10.1124%2Fjpet.102.035634"},{"key":"ref28","doi-asserted-by":"publisher","DOI":"10.1111%2F1523-1747.ep12485165"}],"container-title":["Skin Pharmacology and Physiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.karger.com\/Article\/Pdf\/330491","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.karger.com\/Article\/Pdf\/330491","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,4,23]],"date-time":"2025-04-23T18:29:51Z","timestamp":1745432991000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000330491"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,8,17]]},"references-count":28,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2011,12,1]]},"published-print":{"date-parts":[[2011,12,1]]}},"URL":"https:\/\/doi.org\/10.1159\/000330491","archive":["Portico"],"relation":{},"ISSN":["1660-5527","1660-5535"],"issn-type":[{"value":"1660-5527","type":"print"},{"value":"1660-5535","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011,8,17]]}}}