Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

The end of the road for pathogens

14.01.2014
Scientists prove benefit of textiles with antiviral and antibacterial effect

As part of an AiF research project (AiF no. N 17407), scientists from the Hohenstein Institute in Bönnigheim (Germany) have, for the first time, developed a textile finishing with both an antiviral and an antibacterial function. This technology can be used for products in nurseries, child day care centres and hospitals to interrupt chains of infection.


Colour differences in cleaning cloths made of microfibres before and after finishing with copper pigments. ©Hohenstein Institute


Laboratory test under realistic conditions with cleaning cloths for the inactivation of viruses, bacteria and moulds on surfaces. ©Hohenstein Institute

Most infection-induced respiratory problems are caused by viruses. For example, the respiratory syncytial virus, a pathogen belonging to the family of paramyxoviruses, can cause infections of the upper respiratory tract in the form of colds, coughs, acute bronchitis or even pneumonia, particularly in small children.

At the start of winter, the rate of infections in child day care centres and nurseries regularly increases. Diarrhoea caused by noroviruses and rotaviruses as well as bacterial infections of the respiratory tract and the alimentary tract, on the other hand, are "in season" all year round.

To avoid droplet and smear infections as far as possible, hygienic hands, textiles and surfaces are of paramount importance.

The essential factor in avoiding or limiting the spread of disease in childcare facilities is regular and thorough hand-washing, by children and their carers.

However, textiles can also play a part in spreading pathogens. Viruses do not have their own metabolism and can therefore only survive for a limited time outside a host, and unlike bacteria, do not multiply there.

However, as studies have impressively documented, textiles that are in regular contact with hands have been proven to contribute to the spread of viruses (Sauver et al., 1998). In a scientific examination, clothes as well as domestic and hospital textiles in the form of bed linen, towels, kitchen towels and so on are, alongside hands, an important potential transmission route for viruses.

Surfaces of all kinds, which can also be contaminated by viruses and bacteria via the hands or air, are the third key transmission route for viruses. One important element in preventing infection is therefore the cleaning of surfaces. The Hohenstein scientists are investigating these factors in their current research project.

The test design included cleaning cloths in which, for the first time, antiviral and antibacterial effectiveness were combined with each other in one functional textile finishing. "Over the long term, we are interested in finding out whether the risk of infection, that is to say the spread of germs from person to person, can be reduced by using biofunctional textiles in the future," says Prof. Höfer, head of the hygiene, environment and medicine department.

To achieve this goal, various organic and inorganic colloidal or nanoparticle copper compounds and copper complexes were first applied in a sol-gel process. The effectiveness of the textile microfibre substrate was optimised using various application techniques such as foulard or spray methods. The inactivation of the test viruses was significant, was retained over 15 washing cycles and was at the same time abrasion-resistant.

A second alternative antiviral finish of microfibre cloths was achieved by finishing with copper pigments in a high-temperature exhaust process. In a similar way to dying with dispersion dyes, the dispersed copper pigments were incorporated in the fibres in a slightly acid environment. In a second step, fixing was carried out using a polymer binding agent in a cold padding process to protect the copper particles against mechanical abrasion. These copper finishes also produced good evenness, but there was a slight green tone compared to the originally lighter fabric colour. All samples passed the laboratory tests on skin-friendliness.

The effectiveness tests under realistic conditions were carried out on different surfaces, such as glass, stainless steel or wood, which were contaminated with viruses and wiped with the finished cleaning cloths. The bacterial virus MS2, a non-pathogenic surrogate virus, which due to its structure and environmental stability is comparable to clinically relevant viruses such as novovirus, poliovirus, hepatitis A or enteroviruses, was used as the test virus. The finished microfibre cloths absorbed 91 % of the applied viruses. At the same time, the virus concentration in the cloth was reduced by approximately 90 %. Effectiveness tests against bacteria and mould were also carried out in accordance with standards (DIN EN ISO 20743 and EN 14119). With this test set-up, the finishes were optimised in a targeted manner.

The research project reveals that antiviral cleaning cloths provide an efficient hygienic effect and can help to reduce the germ transfer rate e.g. of pathogens in nurseries and child day care centres. However, this new functionalisation could be of interest in the domestic environment, in hospitals, old people's homes, care homes and in communal facilities (e.g. canteens) and in protective clothing for the fire brigade, emergency services and military.

Rose-Marie Riedl | idw
Further information:
http://www.hohenstein.de

More articles from Materials Sciences:

nachricht Researchers devise microreactor to study formation of methane hydrate
23.08.2017 | NYU Tandon School of Engineering

nachricht Meter-sized single-crystal graphene growth becomes possible
22.08.2017 | Science China Press

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>