scholarly journals PREPARATION OF POLYACRYLONITRILE MEMBRANES WITH ANTIBACTERIAL PROPERTIES

2021 ◽  
Vol 29 (1) ◽  
pp. 20-35
Author(s):  
Polina Vakuliuk ◽  
Iryna Furtat ◽  
Nadya Potvorova ◽  
Lutsiia Zabava ◽  
Henryk Sobczuk
Keyword(s):  
Water Flux ◽  
Antibacterial Properties ◽  
Physicochemical Characteristics ◽  
Low Molecular Weight ◽  
Solution Casting ◽  
Antimicrobial Substances ◽  
Casting Solution ◽  
High Antibacterial Activity ◽  
Polymeric Compounds

We describe the method of formation of polyacrylonitrile membranes with antibacterial properties by addition into the casting solution casting of antibacterial polymeric compounds: polyhexamethyleneguanidine chloride, oligourethanesemicarbazide with terminal cationic pyridinium chloride groups, and the polyvinylpyrrolidone-iodine complex. We investigated the effect of the addition of antibacterial compounds to the casting solution casting on the physicochemical, transport and antibacterial properties of the obtained membranes. We show that increasing the concentration of the bactericidal additives in the casting solution to 3% (wt.) leads to a change in the investigated physicochemical characteristics, water flux and membrane rejection, of polyethyleneglycol and low molecular weight electrolyte type 2-1 (CaCl2). We found that membranes prepared from the casting solution with 3% (wt.) of antimicrobial substances are characterized by high antibacterial activity.

scholarly journals Enhanced Conductivity and Antibacterial Behavior of Cotton via the Electroless Deposition of Silver

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4731
Author(s):  
Changkun Liu ◽  
Dan Liao ◽  
Fuqing Ma ◽  
Zenan Huang ◽  
Ji’an Liu ◽  
...  
Keyword(s):  
Electroless Deposition ◽  
Deposition Time ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
High Antibacterial Activity ◽  
Physical And Chemical ◽  
And Staphylococcus Aureus ◽  
Enhanced Conductivity ◽  
And Chemical Properties

In this study, the surface-initiated atom transfer radical polymerization (SI-ATRP) technique and electroless deposition of silver (Ag) were used to prepare a novel multi-functional cotton (Cotton-Ag), possessing both conductive and antibacterial behaviors. It was found that the optimal electroless deposition time was 20 min for a weight gain of 40.4%. The physical and chemical properties of Cotton-Ag were investigated. It was found that Cotton-Ag was conductive and showed much lower electrical resistance, compared to the pristine cotton. The antibacterial properties of Cotton-Ag were also explored, and high antibacterial activity against both Escherichia coli and Staphylococcus aureus was observed.

scholarly journals Antibacterial Activity of Moroccan Zantaz Honey and the Influence of Its Physicochemical Parameters Using Chemometric Tools

2021 ◽  
Vol 11 (10) ◽  
pp. 4675
Author(s):  
Youssef Elamine ◽  
Hamada Imtara ◽  
Maria Graça Miguel ◽  
Ofélia Anjos ◽  
Letícia M. Estevinho ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Antibacterial Properties ◽  
Principal Component ◽  
Physicochemical Characteristics ◽  
Multidrug Resistant ◽  
Resistant Bacteria ◽  
Coumaric Acid ◽  
Atlas Mountains ◽  
Methyl Syringate ◽  
Chemometric Tools

The emergence of multidrug-resistant bacteria has prompted the development of alternative therapies, including the use of natural products with antibacterial properties. The antibacterial properties of Zantaz honey produced in the Moroccan Atlas Mountains against Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus was evaluated and analyzed using chemometric tools. Minimum inhibitory concentration (MIC) and Minimum bactericidal concentration (MBC) against S. aureus were the lowest (112.5 ± 54.5 mg/mL), revealing that this species was most sensitive to Zantaz honey. P. aeruginosa showed an intermediate sensitivity (MIC= 118.75 ± 51.9 mg/mL), while E. coli was the most resistant to treatment (MIC = 175 ± 61.2 mg/mL). Content of monosaccharides, certain minerals, and phenolic compounds correlated with antibacterial activity (p < 0.05). Principal component analysis of physicochemical characteristics and antibacterial activity indicated that the parameters most associated with antibacterial activity were color, acidity, and content of melanoidins, fructose, epicatechin, methyl syringate, 4-coumaric acid, and 3-coumaric acid.

Bicomponent multifilament yarns of recycled poly(ethylene terephthalate) and nano-titanium dioxide for antibacterial carpet

2021 ◽  
pp. 152808372110117
Author(s):  
Sommai Pivsa-Art ◽  
Komson Sunyikhan ◽  
Weraporn Pivsa-Art
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Ethylene Terephthalate ◽  
Antibacterial Properties ◽  
Nano Structure ◽  
Elongation At Break ◽  
High Antibacterial Activity ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Multifilament Yarns

Recycled poly(ethylene terephthalate) (RPET) multifilament yarns are used in carpet manufacturing as a way to reduce plastic waste. The conventional RPET carpet is however susceptible to bacterial accumulation. As a result, this research experimentally doped RPET with nano-structure titanium dioxide (nano-TiO2) to produce RPET/nano-TiO2 bicomponent multifilament yarns with antibacterial property. The experimental multifilament yarn structure consisted of two parts: neat RPET core and RPET/nano-TiO2 shell. The nano-TiO2 content in the shell was varied between 1 and 3 wt% and the core/shell (C/S) ratios between 90/10, 70/30, and 50/50 w/w. The effects of C/S ratio and nano-TiO2 content on the mechanical and antibacterial properties of bicomponent multifilament yarns were determined. The experimental results indicated that the C/S ratio had no effect on the tenacity and elongation at break. Meanwhile, the tenacity and elongation at break of bicomponent fibers increased with nano-TiO2 content in the shell. The TiO2-doped RPET bicomponent yarns effectively inhibited the growth of Escherichia coli and Staphylococcus aureus. The 90/10 bicomponent multifilament fiber with 3 wt% TiO2 achieved the highest antibacterial activity. The very high antibacterial activity was attributable to greater deposition of nano-TiO2 particles near and on the shell surface.

Modern aspects of the use of drugs of microbial origin

2021 ◽  
Author(s):  
I. O. Pasichna ◽  
V. I. Vdovychenko
Keyword(s):  
Intestinal Microflora ◽  
Antibacterial Properties ◽  
Low Molecular Weight ◽  
Positive Effects ◽  
Microbial Origin ◽  
Transient Nature ◽  
Immunological Effects ◽  
Positive Effect ◽  
Intestinal Microbiocenosis

The recent scientific researches provide evidence of the important role of microbiota for human health. The microbiome is a very complex system, that exists in an equilibrium state and performs multiple functions. The intestinal microflora is disturbed under the influence of iatrogenic factors, and products of microbial origin are used to correct this. The first group of such drugs include probiotics. Their positive effect is associated with immunological and non‑immunological effects. The results of many studies proved the positive effects of probiotics in clinical practice, however publications of recent years outline their low effectiveness and transient nature of the effect, even with prolonged use. Another group of preparations refers to prebiotics, which selectively stimulate the growth of colon microflora. A combination of probiotics and prebiotics, called synbiotics, also in use. Currently, much attention is paid to metabiotics. This group includes various low molecular weight molecules with various chemical manifestations. The components of metabiotics are cellular elements, metabolites and signaling molecules of probiotic cultures. Metabiotics provide the optimal conditions of homeostasis in the contact zone, which are necessary for the normal interaction of the epithelium and microflora, as well as directly affect the physiological functions and biochemical reactions of the macroorganism. The antibacterial properties of metabiotics allow to fight pathogenic and opportunistic flora, without affecting the beneficial microorganisms of the intestine. Creation of targeted metabiotics is a novel promising direction in this area. The possibility of creating a programmed metabiotic drug is considered, depending on the type of disorders of the intestinal microbiocenosis and the peculiarities of the life of specific pathogenic or opportunistic strains.

scholarly journals Antimicrobial and Antibiofilm Properties of Graphene Oxide on Enterococcus faecalis

Antibiotics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 692
Author(s):  
Cecilia Martini ◽  
Francesca Longo ◽  
Raffaella Castagnola ◽  
Luca Marigo ◽  
Nicola Maria Grande ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Enterococcus Faecalis ◽  
Antibacterial Properties ◽  
Luria Bertani ◽  
Bacterial Suspension ◽  
Adhesion Properties ◽  
High Antibacterial Activity ◽  
Luria Bertani Broth ◽  
Bacterial Film

The aim of this study was to evaluate the antibacterial properties of graphene oxide (GO) against Enterococcus faecalis in vitro conditions and when used to coat dentin surface to prevent E. faecalis adhesion. The ATCC strain of E. faecalis 29212 has been used to perform a viability test. The pellet was suspended in ultrapure water, NaCl, PBS buffer, CaCl2 and MgCl2, Luria−Bertani broth solutions. The viability was evaluated by the colony forming unit counting method. Atomic force microscopy images and the measure of surface zeta potential variation were analyzed. Dentin discs were covered with a film of GO (n = 15) or were not treated (n = 15). Bacterial suspension was added to each sample of dentine discs and microbial counts were calculated. Statistically significant differences between two groups were assessed by a two-tailed unpaired t-test. Bacteria cell morphology was investigated with scanning electron microscopy. The highest growth inhibition was obtained in ddH2O and CaCl2 solution while, in PBS and NaCl, GO had poor antibacterial efficacy with a growth enhancing effect in the latter. GO on dentin discs demonstrated high antibacterial activity. GO film has demonstrated acceptable adhesion properties to root dentin and a role in the inhibition of bacterial film proliferation and biofilm formation.

scholarly journals Selection of inorganic-based fertilizers in forward osmosis for water desalination

2015 ◽  
Vol 4 (2) ◽  
pp. 319-329 ◽  
Author(s):  
Tripti Mishra ◽  
RK Srivastava
Keyword(s):  
Molecular Weight ◽  
Water Flux ◽  
Forward Osmosis ◽  
Direct Application ◽  
Water Desalination ◽  
Performance Ratio ◽  
Low Molecular Weight ◽  
Inorganic Fertilizers ◽  
The Difference ◽  
Selection Of

The current study aims at the selection of an appropriate draw solute for forward osmosis process. Separation and recovery of the draw solute are the major criteria for the selection of draw solute for forward osmosis process. Therefore in this investigation six inorganic fertilizers draws solute were selected. The selections of inorganic fertilizers as draw solute eliminate the need of removal and recovery of draw solute from the final product. The final product water of forward osmosis process has direct application in agricultural as nutrient rich water for irrigation. These inorganic fertilizers were tested based on their water extraction (water flux) capacity. This experimental water flux was compared with the observed water flux. It was noted that the observed water flux is much higher than the attained experimental water flux. The difference of these two fluxes was used to calculate the performance ratio of each selected fertilizer. Highest performance ratio was shown by low molecular weight compound ammonium nitrate (22.73) and potassium chloride (21.03) at 1 M concentration, whereas diammonium phosphate (DAP) which has highest molecular weight among all the selected fertilizer show the lowest performance ratio (10.02) at 2 M concentration. DOI: http://dx.doi.org/10.3126/ije.v4i2.12660 International Journal of Environment Vol.4(2) 2015: 319-329

scholarly journals Multifaceted Physiological Roles of Adiponectin in Inflammation and Diseases

2020 ◽  
Vol 21 (4) ◽  
pp. 1219 ◽  
Author(s):  
Hyung Muk Choi ◽  
Hari Madhuri Doss ◽  
Kyoung Soo Kim
Keyword(s):  
Rheumatoid Arthritis ◽  
Autoimmune Diseases ◽  
Metabolic Disorders ◽  
Serum Levels ◽  
High Serum ◽  
Low Molecular Weight ◽  
High Serum Level ◽  
Inflammatory Bowel ◽  
Anti Inflammatory

Adiponectin is the richest adipokine in human plasma, and it is mainly secreted from white adipose tissue. Adiponectin circulates in blood as high-molecular, middle-molecular, and low-molecular weight isoforms. Numerous studies have demonstrated its insulin-sensitizing, anti-atherogenic, and anti-inflammatory effects. Additionally, decreased serum levels of adiponectin is associated with chronic inflammation of metabolic disorders including Type 2 diabetes, obesity, and atherosclerosis. However, recent studies showed that adiponectin could have pro-inflammatory roles in patients with autoimmune diseases. In particular, its high serum level was positively associated with inflammation severity and pathological progression in rheumatoid arthritis, chronic kidney disease, and inflammatory bowel disease. Thus, adiponectin seems to have both pro-inflammatory and anti-inflammatory effects. This indirectly indicates that adiponectin has different physiological roles according to an isoform and effector tissue. Knowledge on the specific functions of isoforms would help develop potential anti-inflammatory therapeutics to target specific adiponectin isoforms against metabolic disorders and autoimmune diseases. This review summarizes the current roles of adiponectin in metabolic disorders and autoimmune diseases.

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