Effect of cationic polyelectrolytes in contact-active antibacterial layer-by-layer functionalization

Holzforschung ◽  
2017 ◽  
Vol 71 (7-8) ◽  
pp. 649-658 ◽  
Author(s):  
Chao Chen ◽  
Josefin Illergård ◽  
Lars Wågberg ◽  
Monica Ek
Keyword(s):  
Cellulose Fibers ◽  
Antibacterial Activities ◽  
Layer By Layer ◽  
Cellulosic Fibers ◽  
Dimethyl Ammonium ◽  
Charge Interaction ◽  
Modification Technique ◽  
Polyelectrolyte Titration ◽  
A Charge ◽  
Cationic Polyelectrolytes

AbstractContact-active surfaces have been created by means of the layer-by-layer (LbL) modification technique, which is based on previous observations that cellulose fibers treated with polyelectrolyte multilayers with polyvinylamine (PVAm) are perfectly protected against bacteria. Several different cationic polyelectrolytes were applied, including PVAm, two different poly(diallyl dimethyl ammonium chloride) polymers and two different poly(allylamine hydrochloride) polymers. The polyelectrolytes were self-organized in one or three layers on cellulosic fibers in combination with polyacrylic acid by the LbL method, and their antibacterial activities were evaluated. The modified cellulose fibers showed remarkable bacterial removal activities and inhibited bacterial growth. It was shown that the interaction between bacteria and modified fibers is not merely a charge interaction because a certain degree of bacterial cell deformation was observed on the modified fiber surfaces. Charge properties of the modified fibers were determined based on polyelectrolyte titration and zeta potential measurements, and a correlation between high charge density and antibacterial efficiency was observed for the PVAm and PDADMAC samples. It was demonstrated that it is possible to achieve antibacterial effects by the surface modification of cellulosic fibers via the LbL technique with different cationic polyelectrolytes.

Complex formation of modified chitosan and carboxymethyl cellulose and its effect on paper properties

TAPPI Journal ◽  
2009 ◽  
Vol 8 (6) ◽  
pp. 29-35 ◽  
Author(s):  
PEDRAM FATEHI ◽  
LIYING QIAN ◽  
RATTANA KITITERAKUN ◽  
THIRASAK RIRKSOMBOON ◽  
HUINING XIAO
Keyword(s):  
Carboxymethyl Cellulose ◽  
Polymer System ◽  
Layer By Layer ◽  
Paper Strength ◽  
Anionic Polymer ◽  
Paper Properties ◽  
Modified Chitosan ◽  
Layer By Layer Assembly ◽  
Polyelectrolyte Titration ◽  
Layer Assembly

The application of an oppositely charged dual polymer system is a promising approach to enhance paper strength. In this work, modified chitosan (MCN), a cationic polymer, and carboxymethyl cellulose (CMC), an anionic polymer, were used sequentially to improve paper strength. The adsorption of MCN on cellulose fibers was analyzed via polyelectrolyte titration. The formation of MCN/CMC complex in water and the deposition of this complex on silicon wafers were investigated by means of atomic force microscope and quasi-elastic light scattering techniques. The results showed that paper strength was enhanced slightly with a layer-by-layer assembly of the polymers. However, if the washing stage, which was required for layer-by-layer assembly, was eliminated, the MCN/CMC complex was deposited on fibers more efficiently, and the paper strength was improved more significantly. The significant improvement was attributed to the extra development of fiber bonding, confirmed further by scanning electron microscope observation of the bonding area of fibers treated with or without washing. However, the brightness of papers was somewhat decreased by the deposition of the complex on fibers. Higher paper strength also was achieved using rapid drying rather than air drying.

On the Indirect Polyelectrolyte Titration of Cellulosic Fibers. Conditions for Charge Stoichiometry and Comparison with ESCA

Langmuir ◽  
2006 ◽  
Vol 22 (2) ◽  
pp. 824-830 ◽  
Author(s):  
A. Elisabet Horvath ◽  
Tom Lindström ◽  
Janne Laine
Keyword(s):  
Cellulosic Fibers ◽  
Polyelectrolyte Titration

scholarly journals Pretreatment optimization process of cotton to overcome the limits of its dyeability with indigo carmine

2019 ◽  
Vol 25 (3) ◽  
pp. 277-288 ◽  
Author(s):  
Maha Abdelileh ◽  
Manel Ticha ◽  
Ibtissem Moussa ◽  
Nizar Meksi
Keyword(s):  
Indigo Carmine ◽  
Chemical Properties ◽  
Cellulose Fibers ◽  
Alkali Concentration ◽  
Process Conditions ◽  
Color Strength ◽  
Design And Optimization ◽  
Cellulosic Fibers ◽  
Untreated Cotton ◽  
Dyeing Parameters

Cationization of cotton is emerging as an effective approach that solves problems associated with dyeing cellulosic fibers, especially cotton, by using indigo carmine. Indeed, this dye has no affinity for cellulosic fibers. Also, it has low fastness to light and washing. In this research, cotton modification is carried out by using Sera Fast GMX cationic agent in order to improve the yield of the exhaustion dyeing process by indigo carmine. The physical and chemical properties of unmodified cellulose fibers, as well as cationic modified cellulose fibers, were compared and investigated by SEM, FTIR and thermogravimetric analysis (TGA). The effect of the cationization process conditions, namely cationizing agent concentration, temperature of cationization, time of cationization and alkali concentration on the performances of dyeing of cotton by indigo carmine were studied, then the results were assessed by measuring the color strength (K/S) and the dyeing bath exhaustion E(%). Finally, a Box-Behnken experimental plan was used for experimental design and optimization of the dyeing parameters. The dyeing results of the optimized process conditions illustrate that cationization improves the fabric dyeability compared to the untreated cotton and the different fastness properties.

scholarly journals An Efficient Method for Cellulose Nanofibrils Length Shearing via Environmentally Friendly Mixed Cellulase Pretreatment

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Yuan Chen ◽  
Yuchan He ◽  
Dongbin Fan ◽  
Yanming Han ◽  
Gaiyun Li ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Trichoderma Viride ◽  
Cellulose Fibers ◽  
Effective Diameter ◽  
Layer By Layer ◽  
Mechanical Grinding ◽  
Hydrolysis Time ◽  
Sem Images ◽  
Enzymatic Pretreatment ◽  
Cellulase Hydrolysis

Cellulose nanofibrils (CNFs) have potential applications in the development of innovative materials and enhancement of conventional materials properties. This paper focused on the mixed cellulase hydrolysis with major activity of exoglucanase and endoglucanase on the cellulose length shearing. By the cooperation of two-step production route, including (1) enzymatic pretreatment using cellulase fromTrichoderma virideand (2) mechanical grinding twice, a shorter cellulose nanofiber was fabricated. The influence of enzymatic charge and hydrolysis time on cellulose fibers was analyzed by using scanning electron microscopy (SEM), Fourier Transform Infrared Spectrometer (FTIR), and X-ray diffractometer (XRD). SEM images revealed that the surface morphology change, effective diameter sharpening, and length shearing of cellulose fibers are as a result of cellulase hydrolysis. The XRD suggested that the cellulase acted on the amorphous regions more strongly than the crystalline domains during layer-by-layer hydrolysis. The enzymatic charge and hydrolysis time significantly affected the yields and hydrolysis products concentration. The enzymatic pretreatment assisted mechanical grinding could improve the uniformity of CNF and helped to obtain CNF with exact length according to the requirement for special applications.

Natural paper-layered composites with air barrier properties achieved by coating with bacterial cellulose

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 9569-9574
Author(s):  
Marta Kaźmierczak ◽  
Tomasz P. Olejnik ◽  
Magdalena Kmiotek
Keyword(s):  
Bacterial Cellulose ◽  
Food Packaging ◽  
Barrier Properties ◽  
Cellulose Fibers ◽  
Packaging Material ◽  
Layered Composites ◽  
Chemical Additives ◽  
Cellulosic Fibers ◽  
Biodegradable Packaging ◽  
Cellulose Pulp

In some respects the safest food packaging material is paper that is completely free of chemical additives, made only from primary cellulosic fibers. There is no information in the literature on giving paper barrier properties using nanocellulose without any additives, especially bacterial cellulose, by applying a coating to a fibrous semi-product. In order to prepare paper-layered composites, paper sheets made of beaten or non-beaten softwood or hardwood cellulose pulp, or their 50/50 (wt./wt.) mix, were used in the experiment. After the application of bacterial cellulose onto the sheets, the paper became completely impermeable to air, which means that fine microbial fibers had filled the voids (pores) between plant cellulose fibers. The results of the experiment could be regarded as a perfect, biodegradable packaging material.

Assembly of Gentamicin and Zn2+ Loaded Coatings on TiO2 Nanotubes to Synergistically Improve the Blood Compatibility, Endothelial Cell Growth and Antibacterial Activities

2020 ◽  
Author(s):  
Changjiang Pan ◽  
Ya Yang ◽  
Youdong Hu ◽  
Li Quan ◽  
Yanchun Wei ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Blood Compatibility ◽  
Antibacterial Properties ◽  
Functional Expression ◽  
Antibacterial Activities ◽  
Layer By Layer ◽  
Zinc Ions ◽  
Continuous Release ◽  
Albumin Adsorption ◽  
Surface Modified

Abstract Titanium and its alloys are widely used in blood contacting implantable and interventional medical devices; however, their biocompatibility is still facing great challenges. In this study, with the aim of improving the biocompatibility and antibacterial activities of titanium, TiO2 nanotubes with a diameter of about 30 nm were firstly prepared on the titanium surface by anodization, followed by the introduction of polyacrylic acid (PAA) and gentamicin (GS) on the nanotube surface by layer-by-layer method, and finally zinc ions were loaded into the surface to improve the bioactivities. The nanotubes have excellent hydrophilic properties and special nanotube-like structure, which can selectively promote the albumin adsorption and enhance the blood compatibility and promote the growth and functional expression of endothelial cells to a certain extent. After the introduction of PAA and GS, although the super-hydrophilicity cannot be achieved, the results of platelet adhesion, cGMP activity, hemolysis rate and partial thromboplastin time (APTT) showed that the blood compatibility was improved, and the blood compatibility was further enhanced after zinc ions loading on the surface. On the other hand, the surface modified materials showed good cytocompatibility to endothelial cells. The introduction of PAA and zinc ions not only promoted the adhesion and proliferation of endothelial cells, but also up-regulated expression of vascular endothelial growth factor (VEGF) and nitric oxide (NO). The slow and continuous release of GS and Zn2+ for more than 14 days, which can significantly improve the antibacterial properties of the materials. Therefore, the present study provides an effective method for the surface modification of titanium-based blood-contacting materials to simultaneously endow with good blood compatibility, endothelial growth behaviors and antibacterial properties.

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