scholarly journals Long-Term Antimicrobial Activity of Phage–Sugar Glasses is Closely Tied to the Processing Conditions

ACS Omega ◽  
2018 ◽  
Vol 3 (12) ◽  
pp. 18295-18303 ◽  
Author(s):  
Vincent Leung ◽  
Logan Groves ◽  
Alexandra Szewczyk ◽  
Zeinab Hosseinidoust ◽  
Carlos D. M. Filipe
Keyword(s):  
Antimicrobial Activity ◽  
Processing Conditions ◽  
Sugar Glasses

Taurolin for the prevention of parenteral nutrition related infection: antimicrobial activity and long-term use

1993 ◽  
Vol 12 (6) ◽  
pp. 365-368 ◽  
Author(s):  
D.A. Johnston ◽  
G. Phillips ◽  
M. Perry ◽  
H. McAlpine ◽  
J. Richards ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Parenteral Nutrition

scholarly journals Seasonal antimicrobial activity of volatile substances emitted by the representatives of Begonia L. genus (Begoniaceae)

2021 ◽  
Vol 10 (1) ◽  
pp. 167-172
Author(s):  
Natalya Vladimirovna Tsybulya ◽  
Tatyana Dmitrievna Fershalova
Keyword(s):  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Antimicrobial Action ◽  
Indoor Environments ◽  
Test Species ◽  
E Coli ◽  
Moderate Growth ◽  
Autumn And Winter ◽  
Test Objects

The paper continues multi-year integrated studies of the numerous taxons of tropical Begonia genus, which allowed us to evaluate the adaptive capacity of the representatives of this genus relying on the revealed morphological, rhythmological and biochemical features. The investigation of antimicrobial activity of intact plants and different fractions of plant extracts allowed us to distinguish several promising representatives of this genus exhibiting activity against a broad range of test microorganisms. The involvement of these plants within phytomodules in child care centers caused a substantial decrease in total microbial contamination of the air. The paper contains results of the experimental investigation of seasonal antimicrobial activity of 13 species, 8 hybrids. The phytoncide activity was measured by exposing the streak cultures of microbial test species bacteria Staphylococcus epidermidis, Esсherichia coli and yeast-like fungi Candida albicans to the volatile emissions of plants. It has been established that 95% of begonias are distinguished by the pronounced activity against S. epidermidis bacteria, 48% against E. coli bacteria and 43% against fungi Candida albicans. The seasonal specificity of the antimicrobial action of begonias was detected: the growth of the colonies of S. epidermidis bacteria is inhibited to the highest extent during spring and summer, at the phase of intense growth, while the activity against E. coli is the highest during autumn and winter at the phase of moderate growth. The taxons with clearly pronounced, long-term and universal antimicrobial action to the studied test objects were revealed and recommended for practical planting in various types of indoor environments. The data obtained in the study may serve as the basis for further investigation of the chemical composition of volatile exometabolites by the example of the representatives of Gireoudia and Coelocentrum sections that have exhibited high antimicrobial activity against S. epidermidis and E. coli.

scholarly journals Effects of Ultrasound on Zinc Oxide/Vermiculite/Chlorhexidine Nanocomposite Preparation and Their Antibacterial Activity

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1309 ◽  
Author(s):  
Karla Čech Barabaszová ◽  
Sylva Holešová ◽  
Kateřina Šulcová ◽  
Marianna Hundáková ◽  
Barbora Thomasová
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Ultrasonic Treatment ◽  
Nanocomposite Materials ◽  
Hybrid Nanocomposite ◽  
X Ray Diffraction ◽  
X Ray

Microbial infection and biofilm formation are both problems associated with medical implants and devices. In recent years, hybrid organic-inorganic nanocomposites based on clay minerals have attracted significant attention due to their application potential in the field of antimicrobial materials. Organic drug/metal oxide hybrids exhibit improved antimicrobial activity, and intercalating the above materials into the interlayer of clay endows a long-term and controlled-release behavior. Since antimicrobial activity is strongly related to the structure of the material, ultrasonic treatment appears to be a suitable method for the synthesis of these materials as it can well control particle size distribution and morphology. This study aims to prepare novel, structurally stable, and highly antimicrobial nanocomposites based on zinc oxide/vermiculite/chlorhexidine. The influence of ultrasonic treatment at different time intervals and under different intercalation conditions (ultrasonic action in a breaker or in a Roset’s vessel) on the structure, morphology, and particle size of prepared hybrid nanocomposite materials was evaluated by the following methods: scanning electron microscopy, X-ray diffraction, energy dispersive X-ray fluorescence spectroscopy, carbon phase analysis, Fourier transforms infrared spectroscopy, specific surface area measurement, particle size analysis, and Zeta potential analysis. Particle size analyses confirmed that the ultrasonic method contributes to the reduction of particle size, and to their homogenization/arrangement. Further, X-ray diffraction analysis confirmed that ultrasound intercalation in a beaker helps to more efficiently intercalate chlorhexidine dihydrochloride (CH) into the vermiculite interlayer space, while a Roset’s vessel contributed to the attachment of the CH molecules to the vermiculite surface. The antibacterial activity of hybrid nanocomposite materials was investigated on Gram negative (Escherichia coli, Pseudomonas aeruginosa) and Gram positive (Staphylococcus aureus, Enterococcus faecalis) bacterial strains by finding the minimum inhibitory concentration. All hybrid nanocomposite materials prepared by ultrasound methods showed high antimicrobial activity after 30 min, with a long-lasting effect and without being affected by the concentration of the antibacterial components zinc oxide (ZnO) and CH. The benefits of the samples prepared by ultrasonic methods are the rapid onset of an antimicrobial effect and its long-term duration.

scholarly journals Electrospun Active Biopapers of Food Waste Derived Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with Short-Term and Long-Term Antimicrobial Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 506 ◽  
Author(s):  
Kelly J. Figueroa-Lopez ◽  
Sergio Torres-Giner ◽  
Daniela Enescu ◽  
Luis Cabedo ◽  
Miguel A. Cerqueira ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Properties ◽  
High Antimicrobial Activity ◽  
Short Term ◽  
Oregano Essential Oil ◽  
E Coli ◽  
Closed Systems ◽  
Antimicrobial Performance ◽  
And Migration

This research reports about the development by electrospinning of fiber-based films made of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) derived from fermented fruit waste, so-called bio-papers, with enhanced antimicrobial performance. To this end, different combinations of oregano essential oil (OEO) and zinc oxide nanoparticles (ZnONPs) were added to PHBV solutions and electrospun into mats that were, thereafter, converted into homogeneous and continuous films of ~130 μm. The morphology, optical, thermal, mechanical properties, crystallinity, and migration into food simulants of the resultant PHBV-based bio-papers were evaluated and their antimicrobial properties were assessed against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) in both open and closed systems. It was observed that the antimicrobial activity decreased after 15 days due to the release of the volatile compounds, whereas the bio-papers filled with ZnONPs showed high antimicrobial activity for up to 48 days. The electrospun PHBV biopapers containing 2.5 wt% OEO + 2.25 wt% ZnONPs successfully provided the most optimal activity for short and long periods against both bacteria.

Long-Term Preservation of Bacteriophage Antimicrobials Using Sugar Glasses

2017 ◽  
Vol 4 (11) ◽  
pp. 3802-3808 ◽  
Author(s):  
Vincent Leung ◽  
Alexandra Szewczyk ◽  
Jacqueline Chau ◽  
Zeinab Hosseinidoust ◽  
Logan Groves ◽  
...  
Keyword(s):  
Sugar Glasses ◽  
Long Term Preservation

Imidazolium poly(butylene terephthalate) ionomers with long-term antimicrobial activity

Polymer ◽  
2012 ◽  
Vol 53 (9) ◽  
pp. 1823-1830 ◽  
Author(s):  
Martino Colonna ◽  
Corrado Berti ◽  
Enrico Binassi ◽  
Maurizio Fiorini ◽  
Simone Sullalti ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Butylene Terephthalate

Study on the Effective of Utilization in Vent-Type Injection Molding

2017 ◽  
Vol 728 ◽  
pp. 277-282 ◽  
Author(s):  
Wiranphat Thodsaratpreeyakul ◽  
Akio Kataoka ◽  
Hirofumi Ichikawa ◽  
Akihiko Imajo ◽  
Putinun Uawongsuwan ◽  
...  
Keyword(s):  
Injection Molding ◽  
Glass Fiber ◽  
Tensile Modulus ◽  
Processing Conditions ◽  
Recycled Pet ◽  
System Availability ◽  
Fiber Loading ◽  
Glass Fiber Reinforced ◽  
Study Characteristics

. In this study, characteristics of glass fiber reinforced recycled-PET composites by using direct fiber feeding injection molding (DFFIM) process were studied. The results, when varied processing conditions, indicated that decreasing of matrix feeding screw speed and increasing of number of glass fiber led to the increasing of fiber loading content, respectively. The average fiber length of glass fiber tended to decrease with the increasing of fiber loading content. Tensile modulus and tensile strength exhibited almost linear correlation with glass fiber load content. For study on stability of DFFIM process performance, at earliest stage of DFFIM process, discarding of at least five injected shots must be done in order to prepare the system availability of DFFIM process. The DFFIM machine could uninterruptedly manufacture composites without any problems occurred during 7 hours, which consequently provided high stability of product quality with long-term fabrication.

scholarly journals Effect of Sodium Salicylate on the Viscoelastic Properties and Stability of Polyacrylate-Based Hydrogels for Medical Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Zuzana Kolarova Raskova ◽  
Martina Hrabalikova ◽  
Vladimir Sedlarik
Keyword(s):  
Sodium Salicylate ◽  
Antimicrobial Properties ◽  
Processing Conditions ◽  
Bacterial Strains ◽  
Noticeable Effect ◽  
Term Stability ◽  
Long Term Stability ◽  
One Year ◽  
The Given

Investigation was made into the effect exerted by the presence of sodium salicylate (0–2 wt.%), in Carbomer-based hydrogel systems, on processing conditions, rheological and antimicrobial properties in tests against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacterial strains, and examples of yeast (Candida albicans) and mould (Aspergillus niger). In addition, the work presents an examination of long-term stability by means of aging over one year the given hydrogels at 8°C and 25°C. The results show that 0.5 wt.% NaSal demonstrated a noticeable effect on the hydrogel neutralization process, viscosity, and antimicrobial properties against all of the tested microorganisms. The long-term stability studies revealed that hydrogels can maintain antimicrobial activity as well as viscosity to a degree that would be sufficient for practical use.

scholarly journals Nisin in the biopreservation of Bordô (Ives) and Niágara table wines from Santa Catarina, Brazil

2013 ◽  
Vol 4 (3) ◽  
pp. 176-183 ◽  
Author(s):  
Daiana Jaqueline Gatti Neres ◽  
Sidnei Emilio Bordignon Junior ◽  
César Milton Baratto
Keyword(s):  
Antimicrobial Activity ◽  
Bacterial Population ◽  
Antimicrobial Compounds ◽  
Chemical Parameters ◽  
Santa Catarina ◽  
Global Concern ◽  
Resistant Strains ◽  
Positive Results ◽  
Lactic Bacteria

The searches for new antimicrobial compounds to control the lactic acid bacteria in winemaking are based in the increasing global concern about the chemical preservatives restrictions and the development of super-resistant strains continuously exposed to sulfites in wineries for decades. The antimicrobial activity of the nisin as a biopreservative was studied for Bordô (Ives) and Niágara grape wines from Santa Catarina, Brazil. Measurements of antimicrobial activity were made by well-diffusion assays. From the eleven previously assessed strains of nisinsusceptible lactic bacteria (nisin concentration 1000 IU ml-1), four were selected for definitive assays with nisin (100 IU ml-1) dissolved in the wines. Positive results for inhibition were obtained for the four strains selected. Next, the direct inhibitory action was assessed in wines artificially inoculated and then treated with nisin. After 60 days of storage, there was reduction in the total bacterial population as compared to control, especially in Bordô (Ives) wine, while the physic-chemical parameters were not influenced by the nisin treatment. The inhibitory activity of nisin was not affected when it was dissolved in wine in the antimicrobial assays, and its potential utilization as biopreservative should be able to aid on the control of autochthonous microbiota, but further studies are required to conclude more precisely the nisin effects at long term in wines.

scholarly journals Аntibacterial inorganic agents: efficiency of using multicomponent systems

2020 ◽  
Vol 10 (4) ◽  
pp. 639-654
Author(s):  
А. A. Meleshko ◽  
A. G. Afinogenova ◽  
G. E. Afinogenov ◽  
A. A. Spiridonova ◽  
V. P. Tolstoy
Keyword(s):  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Antimicrobial Agents ◽  
Metal Oxide Nanoparticles ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Nanoscale Systems ◽  
Gram Negative ◽  
Low Toxicity

Metal and metal oxide nanoparticles (NPs) are promising antibacterial agents. They have a broad antimicrobial activity against both Gram-positive and Gram-negative bacteria, viruses, and protozoans. The use of NPs reduces the possibility of the microbial resistance development. This review briefly shows the general mechanisms and the main factors of antibacterial activity of NPs. In this article, a comprehensive review of the recent researches in the field of new antimicrobial agents with superior long-term bactericidal activity and low toxicity is provided. The review gives the examples of synthesis of double and triple nanocomposites based on following oxides: CuO, ZnO, Fe3O4, Ag2O, MnO2, etc. including metal and nonmetal doped nanocomposites (for example with Ag, Ce, Cr, Mn, Nd, Co, Sn, Fe, N, F, etc.). Compared with bactericidal action of individual oxides, the nanocomposites demonstrate superior antibacterial activity and have synergistic effects. For example, the antimicrobial activity of ZnO against both Gram-positive and Gram-negative bacteria was increased by -100% by formation of triple nanocomposites ZnO—MnO2—Cu2O or ZnO—Ag2O—Ag2S. Similar effect was showed for Ce-doped ZnO and Zn-doped CuO. The present article also provides the examples of nanocomposites containing NPs and organic (chitosan, cellulose, polyvinylpyrrolidone, biopolymers, etc.) or inorganic materials with special structure (graphene oxide, TiO2 nanotubes, silica) which demonstrate controlled release and longterm antibacterial activity. All of the considered nanocomposites and their combinations have a pronounced long-term antimicrobial effect including against antibiotic-resistant strains. They are able to prevent the formation of microbial biofilms on biotic and abiotic surfaces, have low toxicity to eukaryotic cells, demonstrate anti-inflammatory and woundhealing properties in compositions with polymers (sodium alginate, collagen, polyvinylpyrrolidone, etc.). The use of nanoscale systems can solve several important practical problems at the same time: saving of long-term antimicrobial activities while reducing the number of compounds, creation of new antimicrobial agents with low toxicity and reduced environmental impact, development of new biocidal materials, including new coatings for effective antimicrobial protection of medical devices.

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