Udo Bock

Udo Bock
Across Barriers GmbH · CTO

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18
Publications
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636
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Publications

Publications (18)
Article
Full-text available
A formal validation study was performed, in order to investigate whether the commercially-available reconstructed human epidermis (RHE) models, EPISKIN, EpiDerm and SkinEthic, are suitable for in vitro skin absorption testing. The skin types currently recommended in the OECD Test Guideline 428, namely, ex vivo human epidermis and pig skin, were use...
Article
In order to prepare for a validation study to compare percutaneous absorption through reconstructed human epidermis with ex vivo skin absorption through human and animal skin, nine test compounds, covering a wide range of physicochemical properties were selected, namely: benzoic acid; caffeine; clotrimazole; digoxin; flufenamic acid; ivermectin; ma...
Article
The objective of this study was to establish and validate an ex vivo human cervical tissue model appropriate for transport studies of molecular and especially nucleic acid based drugs. For that purpose conditions had to be established for a standardized tissue handling and preparation following hysterectomy to allow an immediate experimental use of...
Article
The objective of this work was to compare the barrier function of the small diameter reconstructed human epidermis model Episkin (d=12 mm) to human skin in vitro. For that purpose a modification for the Franz diffusion cell (d=15mm) had to be developed so as to allow direct comparison with the following human skin preparations: Full thickness skin...
Article
Full-text available
Exposure to chemicals absorbed by the skin can threaten human health. In order to standardise the predictive testing of percutaneous absorption for regulatory purposes, the OECD adopted guideline 428, which describes methods for assessing absorption by using human and animal skin. In this study, a protocol based on the OECD principles was developed...
Article
To characterize the telomerase inhibitor and G-quadruplex stabilizing substance 9-[4-(N,N-dimethylamino)phenylamino]-3,6-bis (3-pyrrolodino-propionamido) acridine x 3HCl (BRACO19) in terms of biopharmaceutical properties such as solubility, protein binding, interaction with membrane lipids, cytotoxicity, and permeability across pulmonary epithelial...
Article
In der frühen Phase der Arzneimittelentwicklung mit einer großen Zahl an Wirkstoffkandidaten sind schnelle Analysenmethoden gefragt. Hier hat sich die LC-MS/MS-Kopplung durchgesetzt. Allerdings muss die Methodenentwicklung Effekte der Probenmatrix berücksichtigen.
Article
In vitro systems for testing of cutaneous penetration and permeation of topically applied drugs and cosmetic products are an interesting alternative to in vivo animal studies. Standardized procedures are necessary for improving reproducibility and comparability with in vivo data.
Article
Ziel der vorliegendenden In-vitro-Studien und In-vivo-Studien war es, die Permeation und Penetration eines 2,5%-igen Ketoprofen (CAS 22071-15-4) Gels [Phardol® Schmerz-Gel (Test-D)] mit Permeation und Penetration zweier anderer Ketoprofen-Gele (Ref-I, Ref-E) sowie eines Ibuprofen (CAS 15687-27-1) Gels (Ref-D) an exzidierter Haut zu vergleichen. Auß...
Article
Cell culture models are useful tools to study the uptake of drugs across the barriers of the human body, like the intestine, the skin or the blood-brain barrier. Cell-based in vitro models not only help to reduce the number of animals used but are also much faster to perform, more cost effective and give more reproducible data than animal studies....
Article
In order to respond to the flood of new active ingredients currently being generated by combinatorial chemistry or molecular biological synthesis, selection procedures able to filter out rapidly and economically those drug candidates with the highest development potential are required. This necessitates the measurement of fundamental biopharmaceuti...
Article
In order to respond to the flood of new active ingredients currently being generated by combinatorial chemistry or molecular biological synthesis, selection procedures able to filter out rapidly and economically those drug candidates with the highest development potential are required. This necessitates the measurement of fundamental biopharmaceuti...
Article
To investigate the mechanisms by which proteolytic enzymes, such as trypsin, chymotrypsin, papain, and bromelain, are able to cross the intestinal mucosal barrier after oral administration to man. Filter-grown Caco-2 cell monolayers were incubated with proteolytic enzymes and then the transepithelial electrical resistance (TEER) and the transport o...
Article
Saarbrücken, Universiẗat, Diss., 1996.

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