https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1024&context=textiles_facpub

Citric acid cross-linking of starch films

https://hal.archives-ouvertes.fr/hal-00506351/document

Towards a sustainable fashion retail supply chain in Europe: Organisation and performance

Improving the integrity of natural biopolymer films used in food packaging by crosslinking approach: A review.

Green synthesis of silver nanoparticles using polysaccharides extracted from marine macro algae.

Achieving rapid definitive hemostasis is essential to ensure survival of patients with massive bleeding in pre-hospital care. It is however challenging to develop hemostatic agents or dressings that simultaneously deliver a fast, long-lasting and safe treatment of hemorrhage. Here, we integrate meso-/micro-porosity, blood coagulation and stability into a flexible zeolite-cotton hybrid hemostat. We employ an on-site template-free growth route that tightly binds mesoporous single-crystal chabazite zeolite onto the surface of cotton fibers. This hemostatic material maintains high procoagulant activity after water flow treatment. Chabazite particles are firmly anchored onto the cotton surface with < 1% leaching after 10 min of sonication. The as-synthesized hemostatic device has superior hemostatic performance over most other clay or zeolite-based inorganic hemostats, in terms of higher procoagulant activity, minimized loss of active components and better scalability for practical applications (a hemostatic T-shirt is hereby demonstrated as an example). Zeolites have attracted attention and have been applied as haemostatic agents; however, there are issues associated with released zeolite powder. Here, the authors report on the growth of zeolites on cotton fibres with high stability and haemostatic ability.

/pdf/a-tightly-bonded-and-flexible-mesoporous-zeolite-cotton-48v9rb07nf.pdf

A tightly-bonded and flexible mesoporous zeolite-cotton hybrid hemostat.

Wood specimens of fir (Abies alba Mill) and beech (Fagus sylvatica L.) were chemically modified with polycarboxylic acids (PCA), cured by convection heating or by microwaves and analyzed by means of HPLC. A new non-formaldehyde cross-linking system was composed of citric acid (CA) and 1, 2, 3, 4-butanetetracarboxylic acid (BTCA) which are representatives of polycarboxylic acids (PCA). These reagents require phosphono based catalysts, so a sodium hypophosphite (SHP) catalyst was used in this study. The effects of the PCA treatment were compared with an earlier introduced 1, 3-dimethylol 4, 5-dihydroxy ethylene urea (DMDHEU) treatment. The dimensional stability of the modified wood was determined by the anti-swelling efficiency (ASE) using the water soak and oven dry method. The results revealed improvement of the ASE of the wood modified with PCA compared to modification with DMDHEU. Qualitative and quantitative determinations of bound acids were performed by HPLC. Further intensification of the processes of wood modification and an increase in the quality of wood based materials were achieved by the use of a microwave treatment. Among other benefits, the formation of crosslinkages between the wood and reagent components caused improvement of the tensile strength retention, particularly in combination with the microwave treatment.

Polycarboxylic acids as non-formaldehyde anti-swelling agents for wood

Polycarboxylic acids BTCA (1, 2, 3, 4-butanetetracarboxylic acid) and CA (citric acid) are used as non-formaldehyde durable press finishing agents instead of the formaldehyde-releasing N-methylol compounds, such as DMDHEU. Isocratic HPLC is applied in an attempt to quantify the PCA that have reacted with the cellulosic material dyed with C.I. Reactive Red 195, C.I. Reactive Yellow 145 and C.I. Reactive Blue 221. Subsequently, the fabrics are cured with formulations containing 60 g/L BTCA or 60 g/L CA and a combination of 15 g/L BTCA and 45 g/L CA. The chromatographic determination reveals that an increase in the shade depth results in the decrease of the amount of BTCA, except in the case when the cotton sample is dyed with C.I. Reactive Blue 221, a copper formazan complex-based dyestuff. The evaluation of the color measurements indicates that the  E* values decrease in order of C.I. Reactive Yellow 145, C.I. Reactive Red 195 and C.I. Reactive Blue 221.

/pdf/non-formaldehyde-durable-press-finishing-of-dyed-fabrics-2zmphuhz97.pdf

Non‐formaldehyde durable press finishing of dyed fabrics: evaluation of cotton‐bound polycarboxylic acids

The purpose of this study was to examine antibacterial and antifungal activity of antibacterial finish based on Citric acid on cotton medical textiles. The ability to effectively reduce the number of gram-negative, gram-positive bacteria and yeast was evaluated, specifically comparing the antibacterial activity after two different drying/curing methods. Citric acid (CA) and diethyl–tetradecyl–[3–(trimethoxysilyl)-propyl] ammonium chloride (Quat) were used for hygiene and disinfection purposes of medical textiles in this study. It was applied by pad-dry process and its fixation to cellulose hydroxyls was enhanced either by high curing temperatures or microwaves (MW). Determination of antibacterial activity of finished products was performed according to ISO 20743:2007 standard before the washing and after the 10 washing cycles. Antibacterial activity was tested against gram-negative bacteria, Escherichia coli, gram-positive-Staphylococcus aureus and yeast, Candida albicans. Obtained results are confirming the possibility of eco-friendly CA application, for the purpose of antimicrobial finishing of cotton medical textiles. Prevention of nosocomial infections with the Citric acid is possible using both curing methods (convection and microwave) and furthermore, the treatment is durable up to 10 washing cycles. Citric acid, as one of the suitable active substances is crosslinked to the cellulose hydroxyls by the formation of ester linkages. Its antimicrobial effectiveness against the chosen microorganisms proved to be the best against S. aureus. Applied finish bath has additional crease proof effectiveness providing sufficient both antimicrobial and crease proof effectiveness, so as the durability against 10 washing cycles.

Study of antimicrobial properties of cotton medical textiles treated with citric acid and dried/cured by microwaves

Aim
To study the antimicrobial activity of citric acid (CA) and sodium hypophosphite monohydrate (SHP) against gram-positive and gram-negative bacteria, and to determine the influence of conventional and microwave thermal treatments on the effectiveness of antimicrobial treatment of cotton textiles.

Cotton textiles modified with citric acid as efficient anti-bacterial agent for prevention of nosocomial infections.

Small wooden samples of fir (Abies alba Mill) and beech (Fagus sylvatica L) were chemically modified by citric acid (CA) as non-formaldehyde cross-linking system reagent and cured by convection heating at three different temperature regimes Two different CA solutions were used, one with NaH2PO2 and the other with NaH2PO4 as a catalyst The dimensional stability of the modified wood was determined by the anti-swelling efficiency (ASE) using the water soak/oven dry method Almost equally large improvement of dimensional stability of wood was attained using NaH2PO4 as when NaH2PO2 was applied as a catalyst

/pdf/dimensional-stability-of-wood-modified-by-citric-acid-using-5bx5529w85.pdf

Sandra Bischof Vukušić

Papers

Polycarboxylic acids as non-formaldehyde anti-swelling agents for wood

Non‐formaldehyde durable press finishing of dyed fabrics: evaluation of cotton‐bound polycarboxylic acids

Study of antimicrobial properties of cotton medical textiles treated with citric acid and dried/cured by microwaves

Cotton textiles modified with citric acid as efficient anti-bacterial agent for prevention of nosocomial infections.

Dimensional stability of wood modified by citric acid using different catalysts