{"id":1696,"date":"2026-08-11T19:00:53","date_gmt":"2026-08-11T19:00:53","guid":{"rendered":"https:\/\/innome.de\/?p=1696"},"modified":"2026-08-11T19:00:57","modified_gmt":"2026-08-11T19:00:57","slug":"tewl-messen-ivpt","status":"publish","type":"post","link":"https:\/\/innome.de\/en\/tewl-messen-ivpt\/","title":{"rendered":"TEWL messen in In-vitro-Permeationstests (IVPT)"},"content":{"rendered":"<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-container-core-group-is-layout-a61a3a89 wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group alignfull has-global-padding is-content-justification-center is-layout-constrained wp-container-core-group-is-layout-84031372 wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--28);margin-bottom:var(--wp--preset--spacing--28);padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\">\n\n\n<p class=\"has-text-align-left\"><strong>Der transepidermale Wasserverlust (TEWL) ist der wichtigste Parameter zur Bewertung der Hautbarriere \u2013 auch in vitro. Wer In-vitro-Permeationstests (IVPT) durchf\u00fchrt, muss die Integrit\u00e4t der Hautbarriere vor und w\u00e4hrend des Tests sicherstellen. Dieser Beitrag erkl\u00e4rt, wie TEWL in IVPT-Setups gemessen wird, welche Ger\u00e4te geeignet sind und worauf es in der Praxis ankommt.<\/strong><\/p>\n\n\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--30);margin-bottom:var(--wp--preset--spacing--30);padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\">\n<section class=\"innome-blog-body\">\n<style>\n.innome-blog-body{background:#ffffff;font-family:Poppins,system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif}\n.innome-blog-body *{box-sizing:border-box}\n.innome-blog-body__container{max-width:860px;margin:0 auto}\n.innome-blog-body__h2{margin:48px 0 16px;color:#009FE3;font-size:30px;line-height:1.1;font-weight:600;letter-spacing:-0.02em}\n.innome-blog-body__h3{margin:32px 0 12px;color:#0f2f3a;font-size:20px;line-height:1.2;font-weight:600}\n.innome-blog-body__p{margin:0 0 18px;color:#3a5260;font-size:16px;line-height:1.8}\n.innome-blog-body__ul{margin:0 0 24px;padding:0;list-style:none;display:flex;flex-direction:column;gap:10px}\n.innome-blog-body__ul li{position:relative;padding-left:22px;color:#3a5260;font-size:16px;line-height:1.7}\n.innome-blog-body__ul li::before{content:\"\";position:absolute;left:0;top:10px;width:8px;height:8px;background:#009FE3;transform:rotate(45deg);border-radius:2px}\n.innome-blog-body__ul strong{font-weight:600;color:#0f2f3a}\n.innome-blog-body__table-wrap{overflow-x:auto;border:1px solid rgba(15,47,58,0.08);border-radius:18px;margin:0 0 28px}\n.innome-blog-body__table{width:100%;border-collapse:collapse}\n.innome-blog-body__table th,.innome-blog-body__table td{padding:14px 18px;text-align:left;border-bottom:1px solid rgba(15,47,58,0.08);border-right:1px solid rgba(15,47,58,0.08);font-size:14px}\n.innome-blog-body__table th:last-child,.innome-blog-body__table td:last-child{border-right:none}\n.innome-blog-body__table tr:last-child td{border-bottom:none}\n.innome-blog-body__table thead th{background:rgba(0,159,227,0.06);color:#009FE3;font-weight:600}\n.innome-blog-body__table tbody td:first-child{font-weight:600;color:#0f2f3a}\n.innome-blog-body__table tbody td:not(:first-child){color:#5d7680}\n.innome-blog-body__hint{background:rgba(0,159,227,0.06);border-left:4px solid #009FE3;border-radius:0 12px 12px 0;padding:20px 24px;margin:0 0 28px}\n.innome-blog-body__hint p{margin:0;color:#0f2f3a;font-size:15px;line-height:1.7}\n.innome-blog-body__hint strong{color:#009FE3}\n<\/style>\n<div class=\"innome-blog-body__container\">\n\n<h2 class=\"innome-blog-body__h2\">Was ist TEWL \u2013 und warum ist er in IVPT entscheidend?<\/h2>\n<p class=\"innome-blog-body__p\">The <strong>transepidermale Wasserverlust (TEWL)<\/strong> beschreibt die Menge an Wasser, die passiv durch die Epidermis verdunstet. Er gilt als Goldstandard zur Bewertung der Hautbarrierefunktion: eine intakte Barriere h\u00e4lt Wasser im Gewebe, eine gesch\u00e4digte Barriere l\u00e4sst mehr Wasser passieren \u2013 und zeigt damit erh\u00f6hte TEWL-Werte.<\/p>\n\n<p class=\"innome-blog-body__p\">In <strong>In-vitro-Permeationstests (IVPT)<\/strong> \u2013 zum Beispiel mit Franz-Diffusionszellen \u2013 wird die Permeation von Wirkstoffen durch Hautmembranen untersucht. Ein h\u00e4ufig untersch\u00e4tztes Problem: Wenn die Hautbarriere bereits vor dem Test besch\u00e4digt ist, verf\u00e4lscht das die Permeationsdaten erheblich. TEWL-Messungen vor und nach der Pr\u00e4paration sind daher ein unverzichtbarer Qualit\u00e4tskontrollschritt.<\/p>\n\n<div class=\"innome-blog-body__hint\">\n<p><strong>Praxishinweis:<\/strong> Die FDA-Guidance f\u00fcr IVPT-Studien empfiehlt ausdr\u00fccklich, die Integrit\u00e4t der Hautbarriere vor dem Test zu \u00fcberpr\u00fcfen \u2013 TEWL ist dabei die bevorzugte Methode.<\/p>\n<\/div>\n\n<h2 class=\"innome-blog-body__h2\">Messprinzipien: Offene vs. geschlossene Kammer<\/h2>\n<p class=\"innome-blog-body__p\">F\u00fcr die TEWL-Messung existieren zwei etablierte Messprinzipien, die sich im IVPT-Einsatz unterschiedlich verhalten:<\/p>\n\n<h3 class=\"innome-blog-body__h3\">Offene Kammer (Open Chamber)<\/h3>\n<p class=\"innome-blog-body__p\">Das offene Kammerverfahren \u2013 eingesetzt z.B. im Tewameter (Courage+Khazaka) \u2013 misst den Wasserdampfgradienten kontinuierlich in Echtzeit. Es ist das weltweit am h\u00e4ufigsten zitierte Verfahren in der Dermatologie. Im In-vitro-Setup ist es durch seine Abh\u00e4ngigkeit von Umgebungsluftstr\u00f6mungen jedoch anf\u00e4lliger f\u00fcr Messartefakte.<\/p>\n\n<h3 class=\"innome-blog-body__h3\">Geschlossene Kammer (Closed Chamber)<\/h3>\n<p class=\"innome-blog-body__p\">Das geschlossene Kammerverfahren \u2013 eingesetzt im <strong>Delfin VapoMeter<\/strong> \u2013 misst den Anstieg der relativen Feuchte in einer abgeschlossenen Messkammer. Es ist vollst\u00e4ndig unabh\u00e4ngig von Umgebungsluftstr\u00f6mungen und eignet sich daher besonders gut f\u00fcr In-vitro-Setups, bei denen Luftbewegungen durch Laborbedingungen nicht immer kontrollierbar sind.<\/p>\n\n<div class=\"innome-blog-body__table-wrap\">\n<table class=\"innome-blog-body__table\">\n<thead>\n<tr><th>Property<\/th><th>Offene Kammer (Tewameter)<\/th><th>Geschlossene Kammer (VapoMeter)<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td>Airflow-Einfluss<\/td><td>\u26a0\ufe0f Empfindlich<\/td><td>\u2705 Unabh\u00e4ngig<\/td><\/tr>\n<tr><td>Messzeit<\/td><td>ab 20 Sekunden<\/td><td>Wenige Sekunden<\/td><\/tr>\n<tr><td>Portabilit\u00e4t<\/td><td>\u26a0\ufe0f Eingeschr\u00e4nkt<\/td><td>\u2705 Vollst\u00e4ndig kabellos<\/td><\/tr>\n<tr><td>IVPT-Eignung<\/td><td>\u2705 Ja (Tewitro-Sonde)<\/td><td>\u2705 Ja<\/td><\/tr>\n<tr><td>Echtzeit-Messung<\/td><td>\u2705 Kontinuierlich<\/td><td>Einzelmessung<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h2 class=\"innome-blog-body__h2\">Schritt f\u00fcr Schritt: TEWL-Messung im IVPT-Setup<\/h2>\n<p class=\"innome-blog-body__p\">Eine standardisierte TEWL-Messung im IVPT-Kontext folgt diesem Ablauf:<\/p>\n\n<ul class=\"innome-blog-body__ul\">\n<li><strong>Hautpr\u00e4paration:<\/strong> Exzidierte Hautmembranen (z.B. humane Exzisionshaut, RHE-Modelle oder synthetische Membranen) auf Zimmertemperatur \u00e4quilibrieren lassen \u2013 mindestens 30 Minuten.<\/li>\n<li><strong>Baseline-Messung:<\/strong> TEWL-Wert vor Montage in die Franz-Zelle messen. Membranen mit TEWL-Werten au\u00dferhalb des definierten Akzeptanzbereichs ausschlie\u00dfen.<\/li>\n<li><strong>Montage in Franz-Zelle:<\/strong> Hautmembran zwischen Donor- und Akzeptorkammer fixieren, auf Dichtigkeit pr\u00fcfen.<\/li>\n<li><strong>Post-Montage-Kontrolle:<\/strong> Optional: TEWL-Messung nach Montage zur \u00dcberpr\u00fcfung, ob die Membran bei der Pr\u00e4paration besch\u00e4digt wurde.<\/li>\n<li><strong>Nach dem Versuch:<\/strong> Abschlie\u00dfende TEWL-Messung zur Dokumentation der Barrierestabilit\u00e4t \u00fcber den Versuchszeitraum.<\/li>\n<\/ul>\n\n<div class=\"innome-blog-body__hint\">\n<p><strong>Wichtig:<\/strong> Definieren Sie Akzeptanzkriterien f\u00fcr den TEWL-Wert vor Versuchsbeginn. Typische Grenzwerte f\u00fcr intakte humane Exzisionshaut liegen bei &lt; 15 g\/m\u00b2\/h \u2013 abweichende Werte sollten zur Ablehnung der Probe f\u00fchren.<\/p>\n<\/div>\n\n<h2 class=\"innome-blog-body__h2\">Welches Ger\u00e4t eignet sich f\u00fcr IVPT?<\/h2>\n<p class=\"innome-blog-body__p\">F\u00fcr In-vitro-Permeationstests empfehlen sich Ger\u00e4te, die:<\/p>\n\n<ul class=\"innome-blog-body__ul\">\n<li><strong>Unabh\u00e4ngig von Umgebungsluft<\/strong> messen \u2013 Laborluftstr\u00f6me verf\u00e4lschen sonst die Ergebnisse<\/li>\n<li><strong>Schnell und reproduzierbar<\/strong> messen \u2013 besonders bei gr\u00f6\u00dferen Probenzahlen<\/li>\n<li><strong>Auf kleinen Messfl\u00e4chen<\/strong> funktionieren \u2013 Franz-Zellen haben begrenzte Membranfl\u00e4che<\/li>\n<li><strong>Wissenschaftlich validiert<\/strong> sind \u2013 f\u00fcr regulatorische Einreichungen (FDA, EMA)<\/li>\n<\/ul>\n\n<p class=\"innome-blog-body__p\">The <strong>Delfin VapoMeter VX<\/strong> erf\u00fcllt alle diese Kriterien: Als geschlossenes Kammersystem ist er airflow-unabh\u00e4ngig, vollst\u00e4ndig portabel und in zahlreichen IVPT-Studien eingesetzt worden. Er ist ISO 13485:2016 zertifiziert und in \u00fcber 60 L\u00e4ndern im Einsatz.<\/p>\n\n<h2 class=\"innome-blog-body__h2\">Fazit<\/h2>\n<p class=\"innome-blog-body__p\">TEWL-Messungen sind im IVPT-Setup kein optionaler Schritt \u2013 sie sind ein unverzichtbares Qualit\u00e4tskontrollinstrument, das die Validit\u00e4t Ihrer Permeationsdaten sicherstellt. W\u00e4hlen Sie ein Ger\u00e4t, das zu Ihrem Setup passt: airflow-unabh\u00e4ngig, schnell und wissenschaftlich anerkannt.<\/p>\n\n<p class=\"innome-blog-body__p\">Wenn Sie Fragen zur Ger\u00e4teauswahl haben oder den Delfin VapoMeter f\u00fcr Ihr Labor testen m\u00f6chten, sprechen Sie uns an \u2013 wir beraten Sie gerne.<\/p>\n\n<\/div>\n<\/section>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--30);margin-bottom:var(--wp--preset--spacing--30);padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\">\n<section class=\"innome-oem\">\n<style>\n.innome-oem{background:#ffffff;font-family:Poppins,system-ui,-apple-system,BlinkMacSystemFont,\"Segoe UI\",sans-serif}\n.innome-oem *{box-sizing:border-box}\n.innome-oem__container{max-width:1340px;margin:0 auto}\n.innome-oem__card{border:1px solid rgba(15,47,58,0.08);border-radius:24px;padding:36px;background:#fff;box-shadow:0 14px 34px rgba(15,47,58,0.05)}\n.innome-oem__title{margin:0 0 12px;color:#009FE3;font-size:32px;line-height:1.05;font-weight:600;letter-spacing:-0.03em}\n.innome-oem__subtitle{margin:0 0 26px;font-size:16px;line-height:1.7;color:#5d7680}\n.innome-oem__links{display:flex;flex-direction:column;gap:14px}\n.innome-oem__link{display:inline-flex;align-items:center;gap:10px;font-size:16px;text-decoration:none;color:#0f2f3a;font-weight:500;transition:all .25s ease}\n.innome-oem__link:hover{color:#009FE3}\n.innome-oem__arrow{color:#009FE3;font-weight:600}\n<\/style>\n<div class=\"innome-oem__container\">\n<div class=\"innome-oem__card\">\n<h2 class=\"innome-oem__title\">Passende Produkte<\/h2>\n<p class=\"innome-oem__subtitle\">Ger\u00e4te und weiterf\u00fchrende Informationen f\u00fcr Ihre TEWL- und Hautbarrieremessungen:<\/p>\n<div class=\"innome-oem__links\">\n<a class=\"innome-oem__link\" href=\"\/alternativen\/tewameter-alternative\/\"><span class=\"innome-oem__arrow\">\u2192<\/span>Tewameter Alternative \u2013 Delfin VapoMeter zur TEWL-Messung<\/a>\n<a class=\"innome-oem__link\" href=\"\/alternativen\/corneometer-alternative\/\"><span class=\"innome-oem__arrow\">\u2192<\/span>Corneometer Alternative \u2013 Delfin MoistureMeter zur Hautfeuchtigkeitsmessung<\/a>\n<a class=\"innome-oem__link\" href=\"\/kontakt\/\"><span class=\"innome-oem__arrow\">\u2192<\/span>Kontakt und Beratung \u2013 Muster, Preisliste oder individuelle Workflow-Beratung anfragen<\/a>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Der transepidermale Wasserverlust (TEWL) ist der wichtigste Parameter zur Bewertung der Hautbarriere \u2013 auch in vitro. Wer In-vitro-Permeationstests (IVPT) durchf\u00fchrt, muss die Integrit\u00e4t der Hautbarriere vor und w\u00e4hrend des Tests [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1696","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TEWL messen in IVPT \u2013 Hautbarriere in vitro pr\u00fcfen | innoME<\/title>\n<meta name=\"description\" content=\"Wie misst man TEWL in In-vitro-Permeationstests (IVPT)? 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