Antibacterial Modification of Textiles Using Nanotechnology

Fouda, Moustafa M. G.

doi:10.5772/45653

Cited by 10 publications

(11 citation statements)

References 56 publications

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“…Kā piemēru var minēt telšu brezenta audumu, kas tika piesūcināts ar ķimikālijām, lai tas nesāktu bojāties un lai uz tā neattīstītos mikroorganismi. Taču šādi audumi bija ar nepatīkamu aromātu un ļoti stīvi, kas tos padarīja nepiemērotus lietošanai ikdienas apģērbā [5], [6].…”

Section: Pašattīrošu Audumu Vēstureunclassified

“…Turpmākajos gados tika veikti eksperimenti, kas balstīti uz kokvilnas auduma šķiedru modificēšanu ar dažādām ķimikālijām (acetilēšana, cianoetilēšana), taču tie netika ieviesti ražošanā, pateicoties metožu dārgajām izmaksām. Sintētiski radītie audumi, kas kļuva arvien populārāki, šādu ideju padarīja vēl neizdevīgāku [5].…”

Section: Pašattīrošu Audumu Vēstureunclassified

“…Pašattīrošu audumu izgatavošanai var tikt izmantotas dažāda veida nanodaļiņas: ZnO [7], TiO2 [8], Cu2O [9], CuO [10], Ag2O [11], SiO2 [12], Ag [5], utt. No nanodaļiņu veidiem vispopulārākās ir ZnO un TiO2 nanodaļiņas.…”

Section: A Pašattīrošu Audumu Izveide Pasaulēunclassified

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Pašattīroši audumi: kas tie ir un kāpēc tādi nepieciešami?

Eglı̅tis

Mežinskis

Buiķe

2018

SJ MSAC

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Pašattīroši audumi ir tekstilmateriāli, kuriem piemīt spēja ārēju vides faktoru iedarbībā atbrīvot savu virsmu no dažādiem piesārņojumiem. Šādi audumi ļauj samazināt ūdens un enerģijas patēriņu, kas saistīts ar drēbju mazgāšanu, samazināt infekciju risku, pateicoties to biocīdām īpašībām, kā arī pasargā cilvēkus no UV starojuma. Papildus tam šādus audumus arī būtu grūtāk saslapināt; tas mūsdienu mitrajā klimatā samazinātu diskomfortu no salijušām drēbēm. Šādus efektus pašattīroši audumi iegūtu ar tādiem mehānismiem kā fotokatalīze un superhidrofobitāte. Lai audumi iegūtu augstāk minētās īpašības, piemērotākie ir ZnO un TiO2 nanodaļiņu veidotie pārklājumi. Savukārt pārklājumu ieguvei jāizmanto sola-gēla metode, kas sniedz iespēju izveidot homogēnus pārklājumus pie temperatūrām, kuras iztur organiskas dabas materiāli. Kopš 2011. gada ar šādu audumu izstrādi ir nodarbojies Rīgas Tehniskās universitātes Dizaina tehnoloģiju institūts. Kopš 2016. gada ar šādiem pārklājumiem nodarbojas arī Rīgas Tehniskās universitātes Silikātu materiālu institūtā. Izmantojot savas gadu desmitu laikā iegūtās zināšanas sola-gēla tehnoloģijā un nanostrukturētu pārklājumu ieguvē, sekmīgi uzsākti pētījumi rūpnieciski izmantojamu tehnoloģiju izstrādei kokvilnas audumiem.Self-Cleaning Fabrics: What Are They and How Are They Used?Self-cleaning fabrics are textile materials, which under the influence of various external environmental factors have the ability to rid their surface from various contaminants. Such fabrics make it possible to reduce water and energy consumption associated with washing clothes, to reduce the risk of infections due to their biocidal properties, and to protect people from UV radiation. In addition, such fabrics would also be more difficult to wet. This would reduce the possibility of wet clothes in damp climates. Such effects by self-cleaning fabrics could be achieved through mechanisms of photocatalysis and superhydrophobicity. To develop textiles with above mentioned properties, the most suitable approach is the deposition of coatings formed by ZnO and TiO2 nanoparticles. In turn, the sol-gel method should be used to obtain coatings. This would make it possible to create homogeneous coatings at temperatures that organic materials can withstand. Institute of Design Technologies, Riga Technical University, has been working on the development of such fabrics since 2011. The research in the field of such coatings at the Institute of Silicate Materials, Riga Technical University, has been performed since 2016. Thanks to decades long research in sol-gel technology and nanostructured coatings, the development of commercially available technologies for cotton fabrics has been successfully launched at the Institute of Silicate Materials.Keywords: self-cleaning fabrics, sol-gel method, TiO2, ZnO

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Section: Pašattīrošu Audumu Vēstureunclassified

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Pašattīroši audumi: kas tie ir un kāpēc tādi nepieciešami?

Eglı̅tis

Mežinskis

Buiķe

2018

SJ MSAC

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“…Silver cations are usually microbicidal at low concentrations without adverse effects for humans. Ag + ions have multiple target sites within the bacterial cell; they attach to the cell membrane or envelope, destroy the membrane or get inside the pathogen through transmembrane proteins, bind to thiol groups (-SH) in key enzymes of ATP production, denature enzymes, inactivate them, or intercalate between the base pairs of DNA, disrupting the hydrogen bonding [8,9].…”

Section: Introductionmentioning

confidence: 99%

Transmissible silver resistance readily evolves in high-risk clone isolates of Klebsiella pneumoniae

Hanczvikkel

Füzi

Ungvári

et al. 2018

AMicr

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Silver is used extensively in both hospitals and outpatient clinics as a disinfectant coating agent on various devices. Resistance to silver was recently reported as an emerging problem in Enterobacteriaceae. Multidrug-resistant high-risk clones of Klebsiella pneumoniae are common causes of serious healthcare-associated infections worldwide posing a serious threat to patients. In this study, we investigated the capacity of both high-risk (CG14/15 and CG258) and minor clone strains of K. pneumoniae to develop resistance to silver. Resistance was induced in vitro in silver-susceptible but otherwise multidrug-resistant clinical isolates. Genetic alterations in the silver-resistant derivative strains with regard to the silver-susceptible isolates were investigated by whole-genome sequencing. The transferability of high-level resistance to silver was also tested. We demonstrated that the high-level resistance to silver can quickly evolve as a consequence of a single-point mutation either in the cusS gene of the chromosomally encoded CusCFBARS efflux system and/or in the silS gene of the plasmid-encoded Copper Homeostasis and Silver Resistance Island (CHASRI) coding also for a metallic efflux. The minimal inhibitory concentrations (MICs) of the strains increased from 4 mg/L (23.5 μM) AgNO to >8,500 mg/L (>50,000 μM) AgNO during induction. Harboring the CHASRI proved an important selective asset for K. pneumoniae when exposed to silver. Successful conjugation experiments using Escherichia coli K12 J5-3 as recipient showed that high-level silver resistance can transmit between strains of high-risk clones of K. pneumoniae (ST15 and ST11) and isolates from additional species of Enterobacteriaceae. The lack of fitness cost associated with the carriage of the CHASRI in a silver-free environment and the presence of the RelEB toxin-antitoxin system on the conjugative plasmids could advance the dissemination of silver resistance. Our results show that multidrug-resistant high-risk clones of K. pneumoniae are capable of evolving and transmitting high-level resistance to silver. This observation should warrant a more judicious use of silver coated-devices to prevent the extensive dissemination of silver resistance.

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“…Los productos antimicrobiales pueden ser de diferentes escalas: los llamados convencionales, que tienen tamaños mayores a 100 nm [17] o nanométricos con dimensiones menores a ese valor, como es el caso de las nanopartículas antimicrobiales [18,16]. Se ha demostrado que los nanocompuestos aplicados en textiles exhiben, de manera novedosa, una mejora en las propiedades como la acción antimicrobiana, mientras preservan la apariencia y confort del producto final, esto gracias a su tamaño nanométrico [19,20,9]. En este artículo se revisan los aspectos más relevantes relacionados con textiles antimicrobiales, tales como tipos de compuestos empleados, microrganismos contra los que actúan y tipos de fibras en los que son aplicados, así como las normas utilizadas para hacer las respectivas evaluaciones del poder antimicrobial en textiles.…”

Section: Introductionunclassified