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BY 4.0 license Open Access Published by De Gruyter July 9, 2016

Effect of the Concentration of Hop Cone Extract on the Antibacterial, Physico-Chemical and Functional Properties of Adhesive Toilet Cleaners

Einfluss der Konzentration von Hopfendoldenextrakt auf die antibakteriellen, physikalisch-chemischen und funktionellen Eigenschaften von Toilettenreinigern
Thomasz Wasilewski , Dominik Czerwonka and Urszula Piotrowska


The study discusses the technology of preparation, and antibacterial, physicochemical and functional properties of advanced eco-friendly products for maintaining hygiene in toilets. The active substance with antibacterial properties which was added to the formulations for the purpose of the study was Humulus lupulus (hop cone) extract obtained under supercritical carbon dioxide conditions. The assumption was that the extract would improve the antibacterial activity of the products without adversely affecting their functional properties. The addition of hop cone extract at the concentration of 0.1% to the tested formulations was found to produce an antibacterial effect against S. aureus bacteria, however, no such activity was demonstrated against E. coli bacteria. Moreover, an increase in the content of the extract was shown to enhance product viscosity, at the same time extending the time of dissolution in water and improving the adhesive power to solid surfaces. The properties are highly desirable for the functionality of products of this type.


In der Untersuchung wurden die Herstellungsstechnologie, die antibakteriellen, physikalisch-chemischen und die funktionellen Eigenschaf-ten von fortschrittlichen und umweltfreundlichen Produkten für die Hygiene in Toiletten behandelt. Bei dem Wirkstoff mit antibakteriellen Eigenschaften, der den in dieser Studie verwendeten Formulierungen zugesetzt wurde, handelt es sich um Humulus lupulus-Extrakt (Hopfendoldenextrakt), der unter überkritischen Bedingungen mit CO2 erhalten wurde. Es wurde angenommen, dass der Extrakt die antibakterielle Aktivität der Produkte verbessern würde, ohne ihre Anwendungseigenschaften zu beeinträchtigen. Die Zugabe eines 0,1 %-igen Hopfendoldenextrakts zu den untersuchten Formulierungen hatte auf S. aureus einen antibakteriellen Effekt, wohingegen kein derartiger Einfluss auf E. coli festgestellt werden konnte. Darüber hinaus wurde festgestellt, dass ein höherer Extraktgehalt die Viskosität des Produkts verstärkt und gleichzeitig die Auflösungszeit in Wasser verlängert und die Adhäsion an festen Oberflächen erhöht. Diese Eigenschaften sind aus der Sicht der Funktion derartiger Präparate sehr vorteilhaft.

*Correspondence address, Dr. Dominik Czerwonka, University of Technology and Humanities in Radom, Chrobrego 27, Radom 26-600, Poland, Tel.: 484836177543, E-Mail:

Tomasz Wasilewski received his M.Sc. in Chemical Engineering from the Technical University of Radom, Poland (2000), his Ph.D. in Materials Science and Engineering from the Technical University of Warsaw, Poland (2004) and his DSc. in Commodity Science from the Cracow University of Economics, Poland (2014). He was supported by the Foundation for Polish Science (2006–2007), and is currently a researcher at the Department of Chemistry, University of Technology and Humanities in Radom. Main research topics of Assoc. Prof. Tomasz Wasilewski are cosmetics and household products, their manufacturing, properties, quality assessment and physicochemistry of aqueous solutions of surfactants. Currently, he is the Head of Department of Chemistry and the Vice Dean of the Faculty of Materials Science, Technology and Design at University of Technology and Humanities in Radom.

Dominik Czerwonka, M.Sc., PhD student at University of Kazimierz Pulaski Technology and Humanities in Radom.

Urszula Piotrowska, M.Sc., PhD student at Medical University of Warsaw.


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Received: 2016-01-25
Accepted: 2016-02-09
Published Online: 2016-07-09
Published in Print: 2016-07-15

© 2016, Carl Hanser Publisher, Munich

This work is licensed under the Creative Commons Attribution 4.0 International License.

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