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1

Influence of bioactive metal fillers on antimicrobial properties of PA12 composites produced by laser-based Powder Bed Fusion of Polymers

Gruber Piotr, Szymczyk-Ziolkowska Patrycja, Olejarczyk Michał, Junka Adam, Fabianowska-Majewska Krystyna, Brozyna Malwina, Kurzynowski Tomasz

Acta of Bioengineering and Biomechanics

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2023

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Vol. 25, no. 4

EN

This study investigated the influence of three types of metallic microfillers, spherical silver and spherical, and dendritic copper, on the ability of polyamide 12 (PA12) to inhibit microorganism growth on the surfaces of samples produced using laser-based powder bed fusion of polymers (PBF-LB/P). The aim of this study was to initially characterize these materials regarding their potential applicability for parts dedicated to use in the hospitals, which surfaces are periodically disinfected using chemical and/or physical measures.

2

LC-MS/MS profiling, antibiofilm, antimicrobial and bacterial growth kinetic studies of Pluchea dioscoridis extracts

El-Shazly Maha A.M., Hamed Ahmed A., Kabary Hoda A., Ghareeb Mosad A.

Acta Chromatographica

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2022

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Vol. 34, no. 3

338--350

EN

The therapeutical applications of ornamental plants have been categorized to be of a great effectiveness in multiple industries from ancient times until present days. Pluchea dioscoridis is widely known Egyptian wooden plant that has been extensively applied for different medicinal purposes. In this study, LC-ESI-MS/MS analysis of the potent antimicrobial ethyl acetate and n-butanol extracts of P. dioscoridis leaves led to identification of 28 and 21 compounds, respectively. The identified compounds were categorized as phenolic acids, phenolic acids derivatives, organic acids, flavonoids (aglycones and glycosides), secoiridoids, coumarin derivatives, and gallotannins derivatives. Among them, caffeic acid 3-sulfate was the most predominate in the investigated extracts followed by ferulic acid and dicaffeoyl-quinic acid. Also, the antimicrobial potentiality of different extracts was evaluated against different pathogenic microbes including Enterobacter cloacae, Micrococcus leutus, Aeromonas hydrophila, Bacillus subtilis, Bacillus cereus, Bacillus lichneformis and Clostridium species. Furthermore, different concentrations of the most potent extract were assayed for antibacterial efficacy on growth curve kinetics against the susceptible bacteria along 4days incubation period. Our gathered data confirmed that, the antimicrobial activity against tested bacteria was different according to the solvent used in the extraction process. Mostly, all the extracts showed a wide spectrum antibacterial activity except the plant water extract which shows a mild activity against Clostridium sp. only. Based on the highest inhibition zone diameter, the ethyl acetate extract followed by butanol extract exhibited the highest inhibition zone with Micrococcus luteus and B. subtilis (20.0 and 18.5 mm) respectively. Determining the effect of ethyl acetate extract at different concentration (0, 0.66, 1.66, 3.33, 6.67, 13.34 and 20.01 mg mL⁻¹) on M. luteus growth kinetics, the data assured that the antibacterial activity shows concentration dependent manner with the highest antibacterial activity at 20.01 mg mL⁻¹ culture. The data also confirmed that, none of the selected concentration showed bactericidal activity in the prepared cultures, and with the prolonged incubation period the bacteria acquire resistance against the extract beginning from second or third day of incubation.

3

Disinfection Properties of Conventional White LED Illumination and Their Potential Increase by Violet LEDs for Applications in Medical and Domestic Environments

Buehler Jule, Sommerfeld Florian, Meurle Tobias, Hoenes Katharina, Hessling Martin

Advances in Science and Technology. Research Journal

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2021

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Vol. 15, no 2

169--175

EN

The antimicrobial impact of visible violet and blue light has been known for more than a century but hardly been applied for purposeful pathogen reduction or prevention. The disinfecting properties of wide-spread warm-white and cool-white light emitting diodes (LEDs) are investigated by irradiation of staphylococci with different LEDs and varying doses. Additionally, the combination of a white and a violet LED illumination is examined. Both white LEDs exhibit an antimicrobial effect, which seems to be dominated by the blue parts of the LED emissions. Unfortunately, the antimicrobial effect is weak in realistic illumination applications. Additional violet LEDs can significantly enhance this impact without a large change in human color perception. This allows reasonable applications in certain medical and domestic environments without endangering humans.

4

Comparison of the Antimicrobial and Antioxidant Efficacy of Viscose Treated with Various Natural Compounds for Medical Use

Šauperl Olivera, Tompa Jasna

Fibres & Textiles in Eastern Europe

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2020

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Vol. 28, no. 6 (144)

85--88

EN

This research is based on the use of a variety of natural compounds and their mixtures with chitosan in order to create an efficient textile product for sanitary/medical use which shows antimicrobial and antioxidant effectiveness at the same time. It is assumed that natural compounds showing antimicrobial and antioxidant efficacy also do so even when applied on a non-woven viscose substrate intended for wound healing. A study of the effectiveness of the individual treatment was performed using antimicrobial (dynamic-stress test) and anti-oxidative (ABTS•+) testing. It was confirmed that the properties of functionalised viscose treated with different functionalisation formulations differ in dependence on the separate formulations. Results show that for a comprehensive insight into the antimicrobial and antioxidant activity of functionalised viscose, a very detailed study of the results of antimicrobial and antioxidant testing is needed in order for it to be possible to create a textile material with the necessary functionality.

PL

Zaprezentowane badania opierały się na wykorzystaniu różnorodnych związków naturalnych i ich mieszanin z chitozanem w celu stworzenia wydajnego wyrobu tekstylnego do użytku sanitarno-medycznego, wykazującego jednocześnie skuteczność przeciwbakteryjną i antyoksydacyjną. Zakłada się, że naturalne związki wykazują skuteczność przeciwbakteryjną i przeciwutleniającą również po nałożeniu na podłoże z włókniny wiskozowej przeznaczonej do procesu gojenia ran. Badanie skuteczności leczenia indywidualnego przeprowadzono za pomocą testów przeciwbakteryjnych (test obciążenia dynamicznego) i antyoksydacyjnych (ABTS•+). Potwierdzono, że właściwości funkcjonalizowanej wiskozy poddanej działaniu różnych formulacji funkcjonalizujących różnią się w zależności od poszczególnych formulacji. Wyniki pokazały, że aby uzyskać kompleksowy wgląd w działanie przeciwbakteryjne i przeciwutleniające funkcjonalizowanej wiskozy, potrzebne jest bardzo szczegółowe badanie wyników testów przeciwbakteryjnych i przeciwutleniających, tak aby możliwe było stworzenie materiału tekstylnego o niezbędnej funkcjonalności.

5

New thiopyridine complexes: design, electrochemical preparation and biological assessment

El-Sabbagh Osama I., Yamany B. Yamany, Eldeab Hany A.

Polish Journal of Chemical Technology

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2019

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Vol. 21, nr 4

20--25

EN

Novel complexes of Ru (III), Cu (II) and Au (III) (2–4) were prepared using 6-phenyl-2-thioxo-4-(trifluoromethyl)-1,2-dihydropyridine-3-carbonitrile (HL, 1) adopting either electrochemical or traditional chemical methods. The electrochemical method is preferred in the synthesis of the complexes than the chemical one because it affords pure products with higher yields in shorter reaction time. The novel thiopyridine complexes were characterized by elemental analyses, IR, 1H, 19F-NMR, TGA and DTA measurements. The antimicrobial activity evaluation revealed that the complex bearing copper metal 3 has nearly the same activity as the reference drug ciprofloxacin. Anti-inflammatory activity evaluation showed that complex 4 containing gold displayed anti-inflammatory activity higher than the reference drug celecoxib upon using carrageenan rat hind paw edema method.

6

Antimicrobial materials properties based on ion-exchange 4A zeolite derivatives

Cardoso Willian A., Savi Geovana D., Feltrin Ana Carolina, Marques Carolina R.M., Angioletto Everton, Pich Claus T., Geremias Reginaldo, Mendes Erlon, Angioletto Elidio

Polish Journal of Chemical Technology

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2019

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Vol. 21, nr 4

31--39

EN

Zeolites are nanoporous alumina silicates in a framework with cations, exhibiting ion-exchange properties with metal ions making them possible antimicrobial materials. The aim of this study was to evaluate the antimicrobial activity of ion-exchanged zeolites and the toxic potential of these materials. Zeolite-Co2+ and Li+ exhibited the most effective inhibition on Staphylococcus aureus growth than in other microorganisms (Escherichia coli and Pseudomonas aeroginosa) in low concentrations. Zeolite-Cu2+ presented higher zone of inhibition when tested against Candida albicans, while Zeolite-Zn2+ showed similar effectiveness among all the microorganisms. When ion-exchanged zeolites were used in effective concentrations to achieve antimicrobial activity, no alterations against bioindicators organisms as Artemia sp. and L. sativa were found and, in addition, they have non-significant result in terms of DNA cleavage activity. Zeolites have advantage of releasing slowly the metals loaded and this characteristic can to be considered promising as potential antimicrobial materials in concentrations safe for use.

7

Phenolic constituents, antimicrobial, antioxidant, and anticancer activities of ethyl acetate and n-butanol extracts of Senna italica

Khalaf Omar M., Ghareeb Mosad A., Saad Amal M., Madkour Hassan M. F., El-Ziaty Ahmed K., Abdel-Aziz Mohamed S.

Acta Chromatographica

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2019

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Vol. 31, no. 2

138--145

EN

Different solvent extracts of the aerial parts of Senna italica (Mill.) were investigated for their chemical constituents and biological activities. Moreover, bio-guided fractionation led to isolation and identification of six compounds, namely: physcion (1), emodin (2), 2-methoxy-emodin-6-O-β-d-glucopyranoside (3), 1-hydroxy-2-acetyl-3-methyl-6-hydroxy-8-methoxynaphthalene (tinnevellin) (4), quercetin 3-O-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranoside (rutin) (5), and 1,6,8-trihydroxy-3-methoxy-9,10-dioxo-9,10-dihydroanthracene (6). The chemical structures of these compounds were established via 1D and 2D 1H- and 13C-NMR spectroscopy. Ethyl acetate and n-butanol extracts as well as compound 3 were evaluated for their anticancer activity against tumor cell lines. The tested extracts showed a moderate to weak activity, while compound 3 showed a moderate activity against human liver cancer (Hep G2) and breast cancer (MCF-7) cell lines with IC50 values of 57.5 and 42.3 μg/mL, respectively. Both ethyl acetate and n-butanol extracts exhibited antimicrobial activities with different strengths, i.e., ethyl acetate exhibited antimicrobial activity against seven test microbes while n-butanol extract showed antimicrobial activity against all tested microbes. This is the first report for the isolation of compound 3 as a new compound from S. italica growing in Egypt.

8

Aktywność ozonowanej oliwy z oliwek przy zwalczaniu drobnoustrojów

Nocuń M., Krzyściak P., Niedźwiedzka E., Niedźwiedzki J., Krzyściak-Kosińska R.

Materiały Ceramiczne

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2018

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T. 70, nr 4

356--370

PL

Ozonowana oliwa z oliwek wspomaga gojenie się ran i wykazuje działanie przeciwdrobnoustrojowe. Oceniono skuteczność ozonowanej oliwy z oliwek z własnej syntezy przeciwko zwykłym bakteriom (Staphylococcus aureus, Escherichia coli, Klebisella pneumoniae i Pseudomonas aeruginosa) oraz grzybom (Candida albicans, Malassezia globosa, Aspergillus niger, Aspergillus fumigatus i Trichophyton mentagrophytes). Do oceny aktywności przeciwdrobnoustrojowej wykorzystano zarówno metodę mikrorozcieńczeń, jak i mikrodyfuzję w agarze. Minimalne stężenia ozonowanej oliwy z oliwek, które hamowały wzrost wszystkich badanych bakterii i grzybów, wynosiły odpowiednio 0,8% i 3,12%. Badania cytotoksyczności z użyciem mysich fibroblastów zarodkowych wskazują, że ozonowana oliwa z oliwek ma niski efekt cytopatyczny do stężenia 6,25%. Ozonowane oleje roślinne wykazują dobrą skuteczność przeciwdrobnoustrojową i niską cytotoksyczność. Konieczne jest jednak opracowanie standardowej metodologii umożliwiającej międzylaboratoryjne porównywanie wyników.

EN

Ozonized olive oil supports healing wounds and shows antimicrobial action. The efficacy of self-produced ozonized olive oil against common bacteria (Staphylococcus aureus, Escherichia coli, Klebisella pneumoniae, and Pseudomonas aeruginosa) and fungi (Candida albicans, Malassezia globosa, Aspergillus niger, Aspergillus fumigatus and Trichophyton mentagrophytes) were evaluated. Both microdilution and diffusion in agar methods were used to assess antimicrobial activity. The minimal concentrations of ozonized olive oil that inhibited all tested bacteria and fungi were 0.8% and 3.12%, respectively. Cytotoxicity studies using murine fibroblasts indicate that ozonized olive oil has a low cytopathic effect up to a concentration of 6.25%. Ozonized vegetable oils have good antimicrobial efficacy and low cytotoxicity. However, it is necessary to develop a standard methodology for interlaboratory comparison of results.

9

Some bioactive properties of Acacia dealbata extracts and their potential utilization in wood protection

Yildiz S., Gürgen A., Can Z., Tabbouche S. A., Kiliç A. O.

Drewno : prace naukowe, doniesienia, komunikaty

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2018

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vol. 61, nr 202

81--97

EN

A study was made of the potential use of Acacia dealbata wood extracts as bioprotective agents. Initially, extracts were obtained from Acacia dealbata sapwood, heartwood and bark, and their antioxidant, antimicrobial and anti-quorum sensing activities were determined. Next, the decay resistance of Scots pine wood samples impregnated with these extracts was examined against the brown rot fungus, Coniophora puteana. The impregnation procedure was performed according to the ASTM D (1413) standard test method at two different concentrations, 3% and 5% by weight, using hot water and methanol as extraction solvents. The strongest antioxidant, antimicrobial and anti-quorum sensing activities were those of the bark extract. Hot water extraction led to lower performance than methanol extraction. According to EN 113 testing methods, the highest level of preservative effect against wood-decaying fungi was observed in the case of 5% methanol extract from the bark.

10

Functionalization of Non-woven Viscose with Formulation of Chitosan and Honey for Medical Applications

Šauperl O., Kunčič M. K., Tompa J., Zemljič L. F., Valh J. V.

Fibres & Textiles in Eastern Europe

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2017

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Vol. 25, no. 5 (125)

67--72

EN

The aim of this research was to develop the formulation of chitosan in combination with honey in different mass proportions of each of the components within the separate mixture. Such a formulation could serve as a functional coating suitable for wound healing. From the perspective of different formulations used within research presented, it is assumed that the different mass fraction of components will affect antimicrobial and antioxidant activity of the functionalised substrate differently. To apply the separate formulation onto a non-woven viscose substrate, the conventional pad-drying process was selected. Moreover a study of the effectiveness of the individual treatment was performed systematically, which is also reflected in the systematics of the experimental techniques selected. Considering antioxidant and antimicrobial action, honey-functionalised non-woven viscose shows higher effectiveness if compared to non-woven viscose functionalized with the chitosan:honey combination.

PL

Celem pracy było opracowanie z kombinacji chitozanu i miodu preparatu służącego jako przyspieszająca gojenie ran powłoka włóknin wiskozowych. W prezentowanych badaniach założono, że różna frakcja masowa składników wpływa odmiennie na działanie przeciwdrobnoustrojowe i przeciwutleniające funkcjonalizowanego podłoża. W celu zastosowania oddzielnego preparatu na nietkanym podłożu wiskozy, wybrano konwencjonalny proces osuszania. Biorąc pod uwagę działanie przeciwutleniające i przeciwbakteryjne, włóknina funkcjonalizowana miodem wykazywała większą skuteczność w porównaniu z włókniną wiskozową funkcjonalizowaną kombinacją chitozanu i miodu.

11

Single-Step Antimicrobial And Moisture Management Finishing Of Pc Fabric Using Zno Nanoparticles

Ashraf M., Siyal M., Nazir A., Rehman A.

Autex Research Journal

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2017

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Vol. 17, no. 3

259--262

EN

Functionalization of textile fabrics with metal oxide nanoparticles can be used to add antibacterial and moisture management properties to them. Current work focuses on the development of these properties on polyester/cotton woven fabrics by treating them with zinc oxide nanoparticles for workwear and sportswear applications. Zinc oxide nanoparticles, prepared by sol-gel method, were applied on fabric samples, which were then tested for antibacterial and moisture management properties using standard test methods AATCC 147 with Staphylococcus aureus and AATCC 195, respectively. It was found that application of ZnO nanoparticles improved both these properties with smaller particle imparting larger effects on both of them.

12

Simultaneous Dyeing and Antibacterial Finishing of Nylon Fabric Using Acid Dyes and Colloidal Nanosilver

Montazer M., Mozaffari A, Alimohammadi F

Fibres & Textiles in Eastern Europe

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2015

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Vol. 23, no. 2 (110)

100—106

EN

The simultaneous finishing and dyeing of nylon fabric were investigated through exhaustion using acid dye and colloidal silver nanoparticles to obtain colored nylon with antimicrobial properties. The antimicrobial property of the fabrics was evaluated against two pathogenic bacteria including E. coli and S. aureus. The durability of antibacterial properties and the colour coordination of the fabrics treated against washing were investigated. In addition, some properties of the fabrics treated, including the surface morphology, and XRD and EDX diagrams were reported and discussed.

PL

Badano właściwości antybakteryjne tkanin nylonowych po procesie jednoczesnego barwienia barwnikami kwasowymi i nanoszenia preparacji antybakteryjnej z zastosowaniem nanocząstek srebra koloidalnego. Właściwości antybakteryjne tkanin oceniano w kierunku dwóch bakterii chorobotwórczych, tj: E. coli i S. aureus. Badano trwałość właściwości antybakteryjnych i wybarwienia tkanin po praniu. Ponadto omówiono morfologię powierzchni oraz wykresy XRD i EDX otrzymanych tkanin.

13

Assessment of Eco-Friendly Natural Antimicrobial Textile Finish Extracted from Aloe Vera and Neem Plants

Khurshid M. F., Ayyoob M., Asad M., Shah S. N. H.

Fibres & Textiles in Eastern Europe

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2015

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Vol. 23, no. 6 (114)

120--123

EN

The aim of the present work was to assess an eco friendly natural antimicrobial textile finish extracted from Aloe gel and Neem plants. Extracted Aloe gel and active substance of Neem were mixed in a mordant to form a finish. Bleached cotton samples were treated with 5, 7, and 10% concentrations of Aloe gel and Neem separately. The same samples were then treated with a hybrid combination of Aloe gel and Neem (HCAN) extracts having 5, 7 and 10% concentrations. These finished samples were subjected to an antibacterial activity test against E. coli and S. aureus, an antifungal activity test against Aspergillus Niger, and a test of their durability of antibacterial finish fastness to washing by standard test methods. It was found that the hybrid combination of Aloe gel and Neem (HCAN) was an effective antibacterial and antifungal agent as compared to Aloe gel and Neem separately. It also showed good durability to washing.

PL

Ekstrakty z żelu aloesowego i aktywnych substancji miodli indyjskiej mieszano w zaprawie barwiarskiej dla uzyskania gotowej preparacji. Bielone bawełniane próbki nasycano roztworem o stężeniu 5%, 7% i 10% żelu aloesowego i miodli indyjskiej. Te same próbki były następnie nasycane preparacją hybrydową zawierającą obydwa składniki o tym samym stężeniu. Uzyskane próbki poddano badaniom antybakteryjnym przeprowadzając testy przeciwko E. coli i S. aureus, i antygrzybicznej aktywności przeciwko Aspergillus niger. Niezależnie od tego przeprowadzano próby trwałości preparacji antybakteryjnych po praniu w standardowych warunkach. Stwierdzono, że preparacja hybrydowa obydwu składników była aktywniejsza zarówno w stosunku do bakterii i grzybów niż preparacje z użyciem jednego tylko składnika.

14

Flame Retardant and Antimicrobial Jute Textile Using Sodium Metasilicate Nonahydrate

Basak S., Samanta K. K., Chattopadhyay S. K., Das S., Narkar R., Dsouza C., Shaikh A. H.

Polish Journal of Chemical Technology

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2014

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Vol. 16, nr 2

106--113

EN

Flame retardant and antimicrobial functionalities were imparted in jute textile using sodium metasilicate nonahydrate (SMSN), commonly known as “water glass”. Sodium metasilicate nonahydrate (SMSN) was applied in jute fabric in different concentration by padding method followed by drying. Flame retardancy of the fabric was evaluated by Limiting Oxygen Index (LOI) and burning behaviour under vertical flammability tester including the char length. Burning rate was found to decrease by almost 10 times after an application of 2% SMSN compared to the control sample. Thermogravimetry (TG) and differential scanning calorimetry (DSC) analysis of both the control and treated jute fabrics were utilized to understand the mechanism of developed flame retardance in jute fabric. It was observed that the SMSN treated samples showed excellent antimicrobial property against both gram positive and gram negative bacteria. Antimicrobial properties of both the control and treated jute fabrics were also measured quantitatively.

15

Synthesis and Thermal Stability of Melamine-Formaldehyde-Nitro Aniline Ion-Exchange Resin

Zala S. N., Gondaliya M. B., Mahetar J. G.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 13, iss. 2

112--118

EN

A series of resins was synthesized and analyzed for selective ion-exchange nature for some metals. Substituted aniline was reacted with formaldehyde, melamine. For the synthesis of ion-exchange resins, sulfuric acid was used as a catalyst. These resins were characterized by elemental analysis and studied antimicrobial activities. Synthesized Resin shows ion exchange capability and moderate activity against microbial. Ion exchange resin also showed reusability and stability at an elevated temperature.

16

Novel s-Triazinyl Schiff Base/Chalcone Congeners: Rational, Synthesis, Antimicrobial and Anti-TB Evaluation

Lakum H. P., Shah D. R., Chikhalia K. H.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 19, iss. 1

56--73

EN

The occurrence of Multi Drug Resistant (MDR) infectious microbial strains has been increased upto alarming level which affects the public health worldwide. To cure this problem, a library of s-triazinyl derivatives comprising schiff base or chalcone motif have been rationalized, synthesized and screened for their in vitro antibacterial activity against five bacterial strains (Staphylococcus aureus MTCC 96, Bacillus subtilis MTCC 441, Escherichia coli MTCC 739, Pseudomonas aeruginosa MTCC 741 and Klebsiella pneumoniae MTCC 109) and four fungal strains (Aspergillus niger MTCC 282, Aspergillus fumigates MTCC 343, Aspergillus clavatus MTCC 1323, Candida albicans MTCC 183) using broth dilution technique. All the newly synthesized scaffolds were further evaluated for their in vitro anti-TB efficacy against the tubercular strain (Mycobacterium tuberculosis H37Rv) using Lowenstein-Jensen MIC method. All the derivatives were well characterized by IR, 1H NMR, 13C NMR, elemental analysis as well as mass spectroscopy.

17

A comparative study of the antioxidant activity and phytochemical composition of leaves extract between three varieties of date palm tree

Eddine L. S., Ladjel S., Mohamed O. M.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 9, iss. 2

162-171

EN

The date palm (Phoenyx dactylifera) consisted, for the people of southern Algeria, as tree of providence. Dates and their extracts are also used for many centuries as a medicine against allergy, inflammation, constipation and gastro-protective; they also have a high antibacterial and antioxidant activity. However, no studies are conducted to evaluate the extract from the leaves of date palm (Phoenyx dactylifera) in point of view of phytochemical composition, antimicrobial and the antioxidant activity. In this study, we have determined the phenolic compounds, antioxidant and antimicrobial activity of methanolic extracts from three varieties of leaves tree. According to the results the leaves extracts have very important values for polyphenols (215.24 to 156.46 mg GAE / g DW) and high antioxidant activity (324. 45 to 206.21 mg GAE / g DW), Diphenyl-1 picrylhydrazyl radical-scavenging activity (IC50 = 2.98 to 4.83 μg / ml); also the three extracts reveal a considerable antimicrobial potency and antifungal considerable activity, the diameter of inhibition is 35.2 to 39.5 mm (concentration 50 mg/ml) for Candida albicans ATCC 90026.

18

Durable Anti-bacterial Nylon Carpet Using Colloidal Nano Silver

Montazer M., Hajimirzababa H., Rahimi M. K., Alibakhshi S.

Fibres & Textiles in Eastern Europe

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2012

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Vol. 20, no. 4 (93)

96--101

PL

Nano cząstki srebra (Ag-NPs) są coraz częściej stosowane dla uzyskania antybakteryjnych właściwości wyrobów włókienniczych. Badano dwoma metodami antybakteryjną skuteczność przeciwko szczepom Escherichia coli i Staphylococcus aureus, odporność na pranie zaimpregnowanych tkanin oraz zmianę koloru pokryć podłogowych pokrywanych preparacją z koloidalnego srebra. Uzyskano świetne wyniki pokrywając tkaniny nylonowe z pokrywą preparacją zawierającą 50-100 ppm składnika czynnego i uzyskując redukcję 99.42% przeciwko Staphylococcus aureus oraz 79.25% przeciwko Escherichia coli. Stwierdzono również zachowanie właściwości antybakteryjnych po dziesięciu praniach. Badano możliwość usuwania cząstek srebra ze ścieków za pomocą spektroskopii UV. Obecność cząstek nanosrebra na powierzchni tkanin potwierdzono stosując SEM i EDX. Zastosowanie badanej preparacji zapobiega powstawaniu przykrego zapachu związanego ze wzrostem patogenicznych mikroorganizmów.

EN

Silver nanoparticles (Ag-NPs) are increasingly being incorporated in a variety of products, textiles, and in healthcare, mainly due to their antibacterial properties. The present study investigated the antimicrobial efficiency and colour changes of floor covering loaded with colloidal silver nanoparticles via a simple and cost-effective method. The influences of colloidal concentration on antimicrobial activity against Escherichia coli and Staphylococcus aureus as well as laundering durability were studied. The results of the silver-treated floor covering (nylon 6 piles) with 50 - 100 ppm dilution exhibited outstanding antimicrobial efficiency and indicated a 99.42% reduction in Staphylococcus aureus and a 79.25% reduction in Escherichia coli. Furthermore, the bioactivity of Ag-NPs was maintained even after ten washings. The removal of silver nanoparticles in wastewater was investigated by UV-visible spectroscopy. Scanning electron microscopy (SEM) and EDX were employed to confirm the presence of nano silver on the surface. The results indicated that Gram positive bacteria are more tolerant to silver than Gram negative bacteria. An appropriate antimicrobial agent deposited on floor covering can prevent unpleasant odours and growth of pathogenic microorganisms.

19

Imparting protective properties to Lyocell via finishing treatments

Ajoy K., Vora S., Vora G.

Autex Research Journal

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2011

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Vol. 11, no. 3

89--92

EN

Lyocell fabric was analysed for its protective properties against UV radiation and disease-causing microbes. Unfinished lyocell fabric afforded no protection against UV radiation and also possessed no antimicrobial activity against the two microbes investigated in this study. To improve its protective properties, lyocell was finished with a UV absorber. To enhance its antimicrobial properties, lyocell was treated with an antimicrobial agent. It was experimentally determined that an optimum UV absorber concentration of 2% of the weight of the fabric was sufficient to improve the UV properties of lyocell fabric to an excellent degree. The optimum antimicrobial concentration for excellent antimicrobial activity was found to be 0.5% of the weight of the fabric. Subsequently, lyocell fabric was finished with the optimum amount of UV absorber and antimicrobial agent in a combined multi-functional bath. The data showed that the UV protection of lyocell fabric was not negatively affected when a multi-functional bath was employed. Similarly, the antimicrobial efficiency was not reduced by multi-functional finishing treatment. Further, the finishing treatments, whether applied singly or in a multi-functional bath, were durable to laundering and to light exposure.

20

Syntheses and Characterization of the Pyrimido[1,2-][1,3,5]triazinthione as a New Ring System and Antibacterial Agent

Waly M. A., Abou Dobara M. I.

Polish Journal of Chemistry

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2009

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Vol. 83, nr 9

1601-1607

EN

The pyrimido[4,5-e][1,2,4]triazine was prepared as a new ring system via annulation of the triazine ring onto the preformed pyrimidine derivative. Various S-benzoylisothiourea derivatives were synthesized by condensation of benzoylthiocyanate with amines. All the synthesized compounds were tested as antimicrobial agents and compounds 11 and 12 showed significant activity to ward to Klebsiella pneumoniae.