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Ochsenhausen, Germany

Zeitler B.,Labor Dr. Merk and Kollegen GmbH | Rapp I.,Labor Dr. Merk and Kollegen GmbH
Applied and Environmental Microbiology | Year: 2014

Touching of contaminated objects and surfaces is a well-known method of virus transmission. Once they are attached to the hands, viruses can easily get adsorbed and initiate infection. Hence, disinfection of frequently touched surfaces is of major importance to prevent virus spreading. Here we studied the antiviral activity of a glucoprotamin-containing disinfectant against influenza A virus and the model virus vaccinia virus (VACV) dried on inanimate surfaces. The efficacy of the surface disinfectant on stainless steel, polyvinyl chloride, and glass coupons was investigated in a quantitative carrier test. Vacuum-dried viruses were exposed to 0.25%, 0.5%, and 1% disinfectant for 5 min, 15 min, and 30 min without agitation, and residual infectivity was determined by endpoint titration. Although glucoprotamin was highly active against both viruses in suspension, limited antiviral activity against the surface-dried viruses was detected. Even after 30 min of exposure to 1% disinfectant, VACV was not completely inactivated. Furthermore, influenza A virus inactivation was strongly affected by the surface composition during the 5-min and 15-min treatments with 0.25% and 0.5% disinfectant. The results presented in this study highlight the relevance of practical tests to assess the antiviral activity of surface disinfectants. High virucidal activity in solution is not necessarily indicative of high antiviral activity against surface-dried viruses. In addition, we want to emphasize that the mere exposure of surfaces to disinfectants might not be sufficient for virus inactivation and mechanical action should be applied to bring attached viruses into contact with virucidal compounds. © 2014, American Society for Microbiology. Source


Eppler S.,University of Ulm | Schroder T.,Atoll GmbH | Friedle J.,Atoll GmbH | Michl S.,Labor Dr. Merk and Kollegen GmbH | And 2 more authors.
Biosensors and Bioelectronics | Year: 2012

For facilitating the identification of appropriate functionalities that may serve as a binding motif of functional monomers, a selection strategy based on high-throughput screening of the binding properties of readily available sorbent materials has been developed. Thereby, the affinity of such ligands to the protein of interest may be rapidly determined. From these studies, it is anticipated that ligand functionalities will be derived, which may lead to advanced selection and design of dedicated functional monomers suitable for decorating the surface of a scavenger material. Thus, specific binding of the target protein of interest should be enabled even in complex solutions such as e.g., biotechnologically relevant cell lysates.In the present contribution, an automated screening method for studying ligand interactions of selected sorbent materials with pepsin - a protein of the protease family - was developed. Aqueous buffer solutions containing pepsin at known constant concentration were pipetted through an array of miniaturized chromatographic solid phase extraction (SPE) columns containing a variety of sorbent materials, and the eluted solutions were analyzed by UV/vis spectroscopy. The established screening protocol was validated against resin materials of known interaction with pepsin. Finally, the developed screening strategy was adapted for a robot system enabling high-throughput screening for a wide variety of sorbent materials and ligand functionalities in a fully automated approach.The obtained results clearly indicate that the established screening routine provides valuable data for characterizing resin-immobilized ligands, and their affinity toward pepsin. © 2012 Elsevier B.V. Source

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