scholarly journals Characteristics of Irradiated Hydrogel Formulated from Composite i/k-carrageenan Combined with Polyvinyl Alcohol

2021 ◽  
Vol 16 (1) ◽  
pp. 1-7
Author(s):  
Bagus Sediadi Bandol Utomo ◽  
Dina Fransiska ◽  
La Ode Sumarlin ◽  
Ihya Sulthonuddin
Keyword(s):  
Tensile Strength ◽  
Surface Morphology ◽  
Polyvinyl Alcohol ◽  
Wound Dressing ◽  
Irradiation Dose ◽  
Water Holding Capacity ◽  
Tropical Waters ◽  
Gel Fraction ◽  
Optimum Formula ◽  
Water Holding

Eucheuma seaweed from tropical waters habitat mainly contains carrageenan, a type of hydrocolloid potential for hydrogel production. This study aims to determine the characteristics of hydrogel formulated from composite i- and k-carrageenan combined with polyvinyl alcohol (PVA) which, could be used further for wound dressing application. The concentrations of composite i/k-carrageenan used were 1.0%, 1.5%, 2.0%, 2.5% and 3.0% w/w, and the PVA concentration was 12.5% w/w. Composite i/k-carrageenan in a proportion of 6:4 by weight. The hydrogel was irradiated using 60Co g-rays with the irradiation dose of 25 and 2 kGy.h-1. The concentration of composite i- and k-carrageenan influenced the gel fraction, water holding capacity, tensile strength, elongation, and surface morphology of the hydrogel. The optimum formula of irradiated composite hydrogel was obtained from 3.0% w/w of composite i/k-carrageenan. The formula had a gel fraction of 61.67%, water holding capacity of  1067.12%, tensile strength of  32.37 x 10-3 MPa, and elongation of  251.67%. Interestingly, the product with the optimum formula had a porous surface morphology and transparency, which are applicable for wound dressing purposes.

scholarly journals Hydrogel Based on Crosslinked Methylcellulose Prepared by Electron Beam Irradiation for Wound Dressing Application

2014 ◽  
Vol 14 (3) ◽  
pp. 262-268 ◽  
Author(s):  
Ambyah Suliwarno
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
Electron Beam ◽  
Wound Dressing ◽  
Irradiation Dose ◽  
Electron Beam Irradiation ◽  
Dose Range ◽  
Swelling Ratio ◽  
Beam Irradiation ◽  
Gel Fraction

The aim of this research is to explore the possibility of methylcellulose polymer to be used as wound dressing material prepared using electron beam technique. The methylcellulose paste solution with various of molecular weight (SM-4, SM-100, SM-400, SM-4000 and SM-8000) at different concentration (15-30% w/v) were irradiated by using electron beam on the dose range of 10 kGy up to 40 kGy. Gel fraction and swelling ratio of hydrogels were determined gravimetrically. Tensile strength and elasticity of hydrogels were measured using a universal testing machine. It was found that with the increasing of irradiation dose from 10 up to 40 kGy, gel fraction and tensile strength were increased for all of hydrogels with various of molecular weight. On contrary, the swelling ratio of hydrogels decreased with increasing of irradiation dose. The optimum hydrogels elasticity were obtained from methylcellulose solution with the concentration range of 15-20% with irradiation dose of 20 kGy and showed excellent performance. The hydrogels based on methylcellulose prepared by electron beam irradiation can be considered for wound dressing material.

scholarly journals Properties of Sodium Alginate–Polyvinyl Alcohol Hydrogels Irradiated By Gamma Ray For Wound Dressing Materials

2013 ◽  
Vol 8 (1) ◽  
pp. 1 ◽  
Author(s):  
Thamrin Wikanta ◽  
Erizal Erizal
Keyword(s):  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Wound Dressing ◽  
Irradiation Dose ◽  
Gamma Ray ◽  
Ph Value ◽  
Suitable Condition ◽  
Water Evaporation ◽  
Swelling Ratio ◽  
Gel Fraction

A copolymer of sodium alginate (SA)–polyvinyl alcohol (PVA) was synthesized by gamma irradiation  to  make  a  hydrogel  and  study  on its properties has been carried out. A  series of 0.5% -2.0% (w/v) of SA solution and 10% (w/v) of PVA solution were prepared in separate tubes. Each of the SA solution was mixed with PVA solution, then it was irradiated with gamma ray at the doses of 30 kGy, 40 kGy, and 50 kGy (dose rate of 10 kGy/hour), respectively. The properties of hydrogels were evaluated comprising of the physical performance, gel fraction, swelling ratio, water evaporation, and pH. The results showed that increase of irradiation dose can increase the gel fraction, but  increase of SA concentration can decrease the gel fraction. SA concentration of 1-2% with gamma ray irradiation dose of 30 kGy was a suitable condition to produce a good hydrogel with properties as follow, gel fraction of 75.83%-78.70%, swelling ratio of 69.12-80.14 g/g, and maximum water evaporated of 54.21-76.41%, the pH value ranged 5.60-5.65. The hydrogels produced are suitable to be used for  wound dressing, especially for wet wounds, and can be applied for two days.

Biosynthesis of Carboxymethylated Bacterial Cellulose Composite for Wound Dressing

2011 ◽  
Vol 685 ◽  
pp. 322-326 ◽  
Author(s):  
Jun Wei Yu ◽  
Xiao Li Liu ◽  
Chang Sheng Liu ◽  
Dong Ping Sun
Keyword(s):  
Bacterial Cellulose ◽  
Wound Dressing ◽  
Culture Medium ◽  
Acetobacter Xylinum ◽  
Water Holding Capacity ◽  
Water Soluble ◽  
Transmission Rates ◽  
Measurement Results ◽  
Water Holding ◽  
Cellulose Composite

A novel bacterial cellulose (BC) composite (carboxymethylated-bacterial cellulose, CM-BC) was synthesized by Acetobacter xylinum by adding water-soluble carboxymethylated cellulose (CMC) in the culture medium. FTIR results showed that CM-BC is obtained by the incorporation of CMC in the network of BC. Water-holding capacity and water vapor transmission rates (WVTR) of CM-BC and BC are determined. The WVTR of CM-BC is comparable to that of BC, but the water-holding capacity of CM-BC is improved compared with BC. Tensile strengths measurement results showed that the fracture stress of CM-BC is higher than that of BC, indicating that CM-BC have more potential wound dressing applications than BC.

scholarly journals Evaluation of Different Methods for Cultivating Gluconacetobacter hansenii for Bacterial Cellulose and Montmorillonite Biocomposite Production: Wound-Dressing Applications

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 267 ◽  
Author(s):  
Katharine Valéria Saraiva Hodel ◽  
Larissa Moraes dos Santos Fonseca ◽  
Isa Moreira da Silva Santos ◽  
Jamile Costa Cerqueira ◽  
Raimundo Evangelista dos Santos-Júnior ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Wound Dressing ◽  
Industrial Applications ◽  
Medical Product ◽  
Water Holding Capacity ◽  
Mechanical And Thermal Properties ◽  
Water Release ◽  
Thermal Stabilities ◽  
Gluconacetobacter Hansenii ◽  
Water Holding

Bacterial cellulose (BC) has received considerable attention due to its unique properties, including an ultrafine network structure with high purity, mechanical strength, inherent biodegradability, biocompatibility, high water-holding capacity and high crystallinity. These properties allow BC to be used in biomedical and industrial applications, such as medical product. This research investigated the production of BC by Gluconacetobacter hansenii ATCC 23769 using different carbon sources (glucose, mannitol, sucrose and xylose) at two different concentrations (25 and 50 g∙L−1). The BC produced was used to develop a biocomposite with montmorillonite (MMT), a clay mineral that possesses interesting characteristics for enhancing BC physical-chemical properties, at 0.5, 1, 2 and 3% concentrations. The resulting biocomposites were characterized in terms of their physical and barrier properties, morphologies, water-uptake capacities, and thermal stabilities. Our results show that bacteria presented higher BC yields in media with higher glucose concentrations (50 g∙L−1) after a 14-day incubation period. Additionally, the incorporation of MMT significantly improved the mechanical and thermal properties of the BC membranes. The degradation temperature of the composites was extended, and a decrease in the water holding capacity (WHC) and an improvement in the water release rate (WRR) were noted. Determining a cost-effective medium for the production of BC and the characterization of the produced composites are extremely important for the biomedical applications of BC, such as in wound dressing materials.

Restructured Pork from Hot Processed Sow Meat: Effect of Encapsulated Food Acids

1985 ◽  
Vol 48 (11) ◽  
pp. 965-968 ◽  
Author(s):  
JOSEPH C. CORDRAY ◽  
DALE L. HUFFMAN
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Water Holding Capacity ◽  
Objective Analysis ◽  
Control Treatment ◽  
Reaction Products ◽  
Total Meat ◽  
Restructured Pork ◽  
Water Holding ◽  
Sodium Acid Pyrophosphate

Encapsulated food acids were used in the manufacture of cured, restructured pork from pre-rigor sow meat. The four treatments were: (a) control, (b) sodium acid pyrophosphate (SAP), (c) sodium acid pyrophosphate plus encapsulated lactic acid (LA), and (d) sodium acid pyrophosphate plus encapsulated glucono-delta-lactone (GDL). Sodium acid pyrophosphate was included in three of the treatments in this study because of its ability to catalyze the curing reaction. Products were manufactured from timmings ground through a 3.2-mm plate on a plate grinder and tenderized muscle chunks ground through a 10-mm plate which were blended together in a ratio of 50:50. No significant differences existed among treatments for percent fat (P>0.05). According to sensory panels, the SAP and GDL treatments were rated as having a more intense flavor than the control treatment (P<0.05). Objective analysis revealed no difference in shear value, tensile strength, water-holding capacity, cooked yield or chilled yield. Significantly more of the total meat pigment was converted to nitroso-hematin in the GDL treatment as compared to the control treatment (P<0.05).

Development and Characteristic of Bacterial Cellulose for Antimicrobial Wound Dressing

2010 ◽  
Vol 152-153 ◽  
pp. 978-987 ◽  
Author(s):  
Hai Yue Zhang ◽  
Xiao Juan Yan ◽  
Yan Jiang ◽  
Juan Cong
Keyword(s):  
Antimicrobial Activity ◽  
Bacterial Cellulose ◽  
Wound Dressing ◽  
Water Holding Capacity ◽  
Swelling Ratio ◽  
Porous Network ◽  
Moist Environment ◽  
Water Holding ◽  
Cellulose Materials ◽  
And Staphylococcus Aureus

Bacterial cellulose (BC) material was obtained through fermentation by Acetobacter xylinumis with superior functional properties. BC is an interesting material for using as a wound dressing since it provides moist environment to a wound and results in a better wound healing. With the aim of using BC as a wound dressing material, moisture content, swelling ratio, purity and antimicrobial activity were investigated. Fresh prepared BC membrane was smooth, colorless, jelly alike, and it showed translucence after NaOH treatment. The purity of the cellulosic pellicle reached 98.32%, and it had good water holding capacity (98.02%) and high swelling ratio (69.88%). Antimicrobial activity test showed that BC material had excellent sterilizing efficacy against Escherichia coli and Staphylococcus aureus. The surface of BC membranes was porous network structure observed by scanning electron microscopy (SEM). Infrared spectroscopy (IR) results showed that this membrane belong to bio-cellulose materials. BC displayed higher water content and water holding capacity, as well as higher purity and antimicrobial activity. It has an extensive usage in biomedicine areas.

Modulation of the Structures and Properties of Bacterial Cellulose Film by Fermentation Carbon Sources

2013 ◽  
Vol 647 ◽  
pp. 160-164
Author(s):  
Guang Yang ◽  
Jian Jian Xie
Keyword(s):  
Bacterial Cellulose ◽  
Wound Dressing ◽  
Carbon Sources ◽  
Water Diffusion ◽  
Water Holding Capacity ◽  
Swelling Ratio ◽  
Pure Cellulose ◽  
Structures And Properties ◽  
Water Swelling ◽  
Water Holding

Bacterial cellulose (BC), a natural pure cellulose synthesized by some bacteria, shows great potentials for wound dressing applications. In order to obtain suitable properties, different fermentation carbon sources, i.e. glucose, maltose and sucrose were used to synthesize BC films by static culture. The crystallinity and pore analysis was performed by X-ray diffraction spectroscopy and nitrogen physisorption measurements, respectively. Some important properties of BC materials from different carbon sources were investigated, such as the mechanical strength, water holding capacity, water swelling ratio and water diffusion ability, which were key parameters for wound dressing applications. For comparison, the conventional cotton fiber was used as control. It was found that the carbon sources could change both the structures and properties of BC. The sucrose-derived BC exhibited lower crystallinity, but more suitable mechanical property, higher water holding capacity and water swelling ratio than other samples. All tested BC samples showed higher water holding capacity and water swelling ratio, but lower water diffusion property than the cotton fibers which were expected as good wound-healing biomedical materials.

A facile route to dual-crosslinking polymeric hydrogels with enhanced mechanical property

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shishan Xue ◽  
Zhiyong Ye ◽  
Qiao Tang ◽  
Yu Wang
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Water Holding Capacity ◽  
Metal Coordination ◽  
Covalent Bonds ◽  
Polymeric Hydrogel ◽  
Accessible Method ◽  
Polymeric Hydrogels ◽  
Water Holding ◽  
Facile Route

Abstract Polymeric hydrogels with excellent biocompatibility, high hydrophilicity, and water-holding capacity have attracted considerable concerns in widely fields. However, most hydrogels exhibit poor mechanical property, which largely limited their applications. Herein, a novel dual-crosslinking polymeric hydrogel crosslinked by covalent bonds and metal coordination interactions between Fe3+ and –COO- was fabricated through accessible method. The metal coordination interactions within the hydrogel were established through dipping in the FeCl3 solution to reinforce the backbones of the hydrogel. The obtained polymeric hydrogel exhibits enhanced tensile strength (∼4.92 MPa), stiffness (∼6.168 MPa), and toughness (∼2.835 MJ m−3).

scholarly journals Mechanical properties of edible film based bacterial cellulose from sago liquid waste using starch as stabilizer

2021 ◽  
Vol 948 (1) ◽  
pp. 012063
Author(s):  
N A Yanti ◽  
S W Ahmad ◽  
L O A N Ramadhan ◽  
T Walhidayah
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Bacterial Cellulose ◽  
Young’S Modulus ◽  
Liquid Waste ◽  
Cassava Starch ◽  
Water Holding Capacity ◽  
Edible Film ◽  
Elongation At Break ◽  
Water Holding

Abstract Edible film is a thin layer made of edible material as a packaging for food products. In the edible film production, required additional material that serves as stabilizer and plasticizer. This research aimed to determine the mechanical properties of the edible film-based bacterial cellulose from sago liquid waste using some types of starch as a stabilizer. The starches used as stabilizers in making edible films were corn, cassava, and sago starch. Mechanical properties were measured include tensile strength, elongation at break, elasticity (Young’s modulus), and water holding capacity (WHC). The results showed that the thickness of corn, sago, and cassava starch was 0.08 mm, 0.09 mm, and 0.11 mm, respectively. The mechanical properties of the edible film with corn, sago, and cassava starch as stabilizers namely a tensile strength (MPa) were 10.90; 15.90 and 61.92 respectively, elongation at break (%) were 8, 20, and 87, young’s modulus (MPa) were 13.48, 7.84 and 6.98, respectively and water holding capacity (g/g) were 34.26; 18.18 and 16.40 respectively. Therefore, the utilization of starch as a stabilizer in edible film can improve its mechanical properties.

Study on Medical Polyvinyl Alcohol (PVA) / Polyvinyl Pyrrolidone (PVP) Hydrogel Wound Dressing

2011 ◽  
Vol 287-290 ◽  
pp. 1925-1928
Author(s):  
Shu Di Zhang ◽  
Yu Chun Zhai ◽  
Zhen Fang Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Water Absorption ◽  
Human Body ◽  
Wound Dressing ◽  
Ph Value ◽  
Polyvinyl Pyrrolidone ◽  
Water Contents

Polyvinyl alcohol (PVA)/polyvinyl pyrrolidone (PVP) hydrogel wound dressing has been fabricated using freezing-thawing method. The content of water, the rate of water absorption and pH value of hydrogel were tested, The mechanical properties and water transmissivities of hydrogels were analyzed when the PVP contents were difference. Experiments results show that the hydrogels diaphaneity is better, water contents are over 70percent; water transmissivity of hydrogels are over 100 percent, the highest value reaches to 204 percent; the pH value closes to the level of human body, the highest pH value reaches to 6.83; the tensile strength of hydrogel is 0.75 MPa when PVP content is 8 percent, reaches to the largest value; all of PVA/PVP hydrogels water transmissivities reach to 700 g·m-2·24h-1.

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