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Journal articles on the topic 'Dye stability; Chitosan'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Wong, Ka Wai, Xing Hua Li, Novem C. Y. Lam, and Kimmy Mui Chan. "Luminous Chitosan-Dye Nanocomposite Particles with Enhanced Lifetime and Stability." Materials Science Forum 722 (June 2012): 87–93. http://dx.doi.org/10.4028/www.scientific.net/msf.722.87.

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Nanoparticular chitosan-dye nanocomposites were prepared by a facile ionotropic gelation, which show a much improved stability against UV and ozone attack. The nanocomposites do not contain any toxic material. Also, as natural occurring biopolymeric chitosan is used as the matrix material, the nanocomposite is biocompatible and biodegradable with high bioaffinity. After suitable bioconjugation, the developed luminous chitosan-dye nanocomposites can be used as target biolabels in various medical and biomedical applications.

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2

Kumar, Santosh, Fei Ye, Babak Mazinani, Sergey Dobretsov, and Joydeep Dutta. "Chitosan Nanocomposite Coatings Containing Chemically Resistant ZnO–SnOx Core–shell Nanoparticles for Photocatalytic Antifouling." International Journal of Molecular Sciences 22, no. 9 (2021): 4513. http://dx.doi.org/10.3390/ijms22094513.

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Functional nanocomposites with biopolymers and zinc oxide (ZnO) nanoparticles is an emerging application of photocatalysis in antifouling coatings. The reduced chemical stability of ZnO in the acidic media in which chitosan is soluble affects the performance of chitosan nanocomposites in antifouling applications. In this study, a thin shell of amorphous tin dioxide (SnOx) was grown on the surface of ZnO to form ZnO–SnOx core–shell nanoparticles that improved the chemical stability of the photocatalyst nanoparticles, as examined at pH 3 and 6. The photocatalytic activity of ZnO–SnOx in the degr

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3

Kausar, Ayesha. "Scientific potential of chitosan blending with different polymeric materials: A review." Journal of Plastic Film & Sheeting 33, no. 4 (2016): 384–412. http://dx.doi.org/10.1177/8756087916679691.

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Chitosan, the second most abundant natural fiber after cellulose, is a partially deacetylated polymer of N-acetyl-d-glucosamine. Chitosan is nontoxic, biodegradable, and biocompatible. It also has film-forming properties. Chitosan is blended with many polymeric materials such as: poly(methyl methacrylate), epoxy, polystyrene, polyaniline, polysulfone, and polycarbonate. Chitosan has been used as a filler as well as a fiber material in thermoplastic polymers. However, polymer/chitosan blends may show incompatibility owing to repulsion between polar chitosan functional groups and hydrophobic pol

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4

Jaiswal, Nivedita, Veda P. Pandey, and Upendra N. Dwivedi. "Immobilization of papaya laccase in chitosan led to improved multipronged stability and dye discoloration." International Journal of Biological Macromolecules 86 (May 2016): 288–95. http://dx.doi.org/10.1016/j.ijbiomac.2016.01.079.

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FRYE, MARSHALL, SHANGRADHANVA E. VASISTH, AMALIE ATASSI, DAVID MAZYCK, and JUAN C. NINO. "EFFECT OF DEGREE OF SULFONATION IN NANOCELLULOSE/CHITOSAN COMPOSITE ON ADSORPTION OF CATIONIC DYE AS OPIOID SIMULANT." Cellulose Chemistry and Technology 55, no. 1-2 (2021): 87–99. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.09.

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In this study, the effect of nanocellulose sulfonate group content on adsorption of an opioid simulant was tested. The opioid simulant used was Victoria blue R, an amine dye. Nanocellulose filters were fabricated by crosslinking cellulose nanocrystals (CNCs) with chitosan to improve the mechanical stability of freeze-dried CNCs. Thermogravimetric analysis confirmed the filter’s thermal stability and operating temperatures. Conductometric titration, Fourier transform infrared spectroscopy, and scanning electron microscopy techniques were used to characterize the degree of nanocellulose function

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Pang, Yean Ling, Jia Hui Tan, Steven Lim, and Woon Chan Chong. "A State-of-the-Art Review on Biowaste Derived Chitosan Biomaterials for Biosorption of Organic Dyes: Parameter Studies, Kinetics, Isotherms and Thermodynamics." Polymers 13, no. 17 (2021): 3009. http://dx.doi.org/10.3390/polym13173009.

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Chitosan is a second-most abundant biopolymer on earth after cellulose. Its unique properties have recently received particular attention from researchers to be used as a potential biosorbent for the removal of organic dyes. However, pure chitosan has some limitations that exhibit lower biosorption capacity, surface area and thermal stability than chitosan composites. The reinforcement materials used for the synthesis of chitosan composites were carbon-based materials, metal oxides and other biopolymers. This paper reviews the effects of several factors such as pH, biosorbent dosage, initial d

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Shi, Yi Dong, Sheng Ji Jin, and Zong Qin Guo. "Applied Researches of Chitosan and Silicon Sol as Fixing Agent on Ramie." Advanced Materials Research 332-334 (September 2011): 1369–73. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.1369.

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To improve the color fastness of the ramie fabric dyed with reactive dye, we researched the fixation effects of Chitosan biguanide hydrochloride (CGH), silicon sol and the fixing agent TR7234 on the ramie fabric. It was found that the mixture of CGH/silicon sol/TR7234 improved obviously the color fastness of the reactive dye on the fabric. The color fastness to dry rubbing increased by 1grade and the color stability to washing got the raise. Based on SEM and FTIR analysis, it was shown that the mixture of three agents formed a film on the surface of the fabric, and this film had the chemical b

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8

Zheng, Xuejing, Xiaoxiao Li, Jinyang Li, et al. "Efficient removal of anionic dye (Congo red) by dialdehyde microfibrillated cellulose/chitosan composite film with significantly improved stability in dye solution." International Journal of Biological Macromolecules 107 (February 2018): 283–89. http://dx.doi.org/10.1016/j.ijbiomac.2017.08.169.

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9

Demircivi, Pelin, and Esra Bilgin Simsek. "Fabrication of Zr-doped TiO2/chitosan composite catalysts with enhanced visible-light-mediated photoactivity for the degradation of Orange II dye." Water Science and Technology 78, no. 3 (2018): 487–95. http://dx.doi.org/10.2166/wst.2018.298.

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Abstract Zirconium/titanium/chitosan (Zr/Ti/CHT) composite catalysts were synthesized by sol-gel method using different chitosan amounts (5–20 wt.%) and their activity in the photocatalytic degradation of Orange II dye was evaluated for the first time. The results were compared with Zr/Ti, Zr/CHT and Ti/CHT catalysts. The composite catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy analysis. XRD analysis revealed that the Zr/Ti/CHT composite catalyst showed high crystallinity of ana

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10

Morais da Silva, Paula Mayara, Natália Gabriele Camparotto, Katherly Tainá Grego Lira, Carolina Siqueira Franco Picone, and Patrícia Prediger. "Adsorptive removal of basic dye onto sustainable chitosan beads: Equilibrium, kinetics, stability, continuous-mode adsorption and mechanism." Sustainable Chemistry and Pharmacy 18 (December 2020): 100318. http://dx.doi.org/10.1016/j.scp.2020.100318.

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11

Yahya, Wan Zaireen Nisa, Wong Theen Meng, Mehboob Khatani, Adel Eskandar Samsudin, and Norani Muti Mohamed. "Bio-based chitosan/PVdF-HFP polymer-blend for quasi-solid state electrolyte dye-sensitized solar cells." e-Polymers 17, no. 5 (2017): 355–61. http://dx.doi.org/10.1515/epoly-2016-0305.

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AbstractDye-sensitized solar cells (DSSCs) have emerged to become one of the most promising alternatives to conventional solar cells. However, long-term stability and light-to-energy conversion efficiency of the electrolyte in DSSCs are the main challenges in the commercial use of DSSCs. Current liquid electrolytes in DSSCs allow achieving high power conversion efficiency, but they still suffer from many disadvantages such as solvent leakage, corrosion and high volatility. Quasi-solid state electrolytes have therefore been developed in order to curb these problems. A novel polymer electrolyte

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Chiu, Chih-Wei, Ming-Tsung Wu, Chih-Lung Lin та ін. "Adsorption Performance for Reactive Blue 221 Dye of β-Chitosan/Polyamine Functionalized Graphene Oxide Hybrid Adsorbent with High Acid–Alkali Resistance Stability in Different Acid–Alkaline Environments". Nanomaterials 10, № 4 (2020): 748. http://dx.doi.org/10.3390/nano10040748.

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A hybrid material obtained by blending β-chitosan (CS) with triethylenetetramine-functionalized graphene oxide (TFGO) (CSGO), was used as an adsorbent for a reactive dye (C.I. Reactive Blue 221 Dye, RB221), and the adsorption and removal performances of unmodified CS and mix-modified CSGO were investigated and compared systematically at different pH values (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12). The adsorption capacities of CS and CSGO were 45.5 and 56.1 mg/g, respectively, at a pH of 2 and 5.4 and 37.2 mg/g, respectively, at a pH of 12. This indicates that TFGO was successfully introduced i

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Sahu, Shraddha, Shailendra Singh Shera, and Rathindra Mohan Banik. "Enhanced Reusability of Horseradish Peroxidase Immobilized onto Graphene Oxide/Magnetic Chitosan Beads for Cost Effective Cholesterol Oxidase Assay." Open Biotechnology Journal 13, no. 1 (2019): 93–104. http://dx.doi.org/10.2174/1874070701913010093.

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Background: Horseradish Peroxidase (HRP) is an important biocatalyst extensively used in enzymatic reactions. Cholesterol oxidase (ChoX) is a commercially valuable enzyme used in the estimation of cholesterol in human serum. ChoX is an oxygen oxidoreductase class of enzyme which catalyzes the oxidation of cholesterol in the presence of O2, liberating hydrogen peroxide H2O2 as a by-product. HRP catalyzes the reduction of this H2O2 in the presence of a redox dye (chromophore), producing a pink colored Quinoneimine which can be measured spectrophotometrically. The use of soluble HRP makes this as

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14

Lopez-Barbosa, Natalia, Ana Lucía Campaña, Juan C. Cruz, Nancy Ornelas-Soto, and Johann F. Osma. "Enhanced Catalytic Dye Decolorization by Microencapsulation of Laccase from P. Sanguineus CS43 in Natural and Synthetic Polymers." Polymers 12, no. 6 (2020): 1353. http://dx.doi.org/10.3390/polym12061353.

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Polymeric microcapsules with the fungal laccase from Pycnoporus sanguineus CS43 may represent an attractive avenue for the removal or degradation of dyes from wastewaters. Microcapsules of alginate/chitosan (9.23 ± 0.12 µm) and poly(styrenesulfonate) (PSS) (9.25 ± 0.35 µm) were synthesized and subsequently tested for catalytic activity in the decolorization of the diazo dye Congo Red. Successful encapsulation into the materials was verified via confocal microscopy of labeled enzyme molecules. Laccase activity was measured as a function of time and the initial reaction rates were recovered for

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15

Hastuti, Budi, and Saptono Hadi. "The Modified of Cellulose Through Polyelectrolite Membrane Techniques as Adsorbent Candidate for Removing of Dyes." Oriental Journal of Chemistry 34, no. 6 (2018): 3161–64. http://dx.doi.org/10.13005/ojc/340665.

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Disposal of dyestuff into rivers or other water can disrupt the aquatic biota ecosystem in it. Thus the pollution of dyes in the aquatic environment needs to be overcome. One effort to reduce the dye content in water is by making adsorbent membranes based of cellulose which are biomaterials of chitosan and alginate. This aims of study was to make polyelectrolyte membranes from chitosan and alginate which will be applied as adsorbents of textile dyestuffs. The research was done by mixing chitosan gel in 2,5% acetic acid solution with alginat gel in water for 3 hours stirring. The solution then

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16

Morais da Silva, Paula Mayara, Natália Gabriele Camparotto, Tauany de Figueiredo Neves, et al. "Effective removal of basic dye onto sustainable chitosan beads: Batch and fixed-bed column adsorption, beads stability and mechanism." Sustainable Chemistry and Pharmacy 18 (December 2020): 100348. http://dx.doi.org/10.1016/j.scp.2020.100348.

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Mei, Yang, Sun Runjun, Feng Yan, Wang Honghong, Dou Hao, and Liu Chengkun. "Preparation, characterization and kinetics study of chitosan/PVA electrospun nanofiber membranes for the adsorption of dye from water." Journal of Polymer Engineering 39, no. 5 (2019): 459–71. http://dx.doi.org/10.1515/polyeng-2018-0275.

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Abstract In this study, chitosan (CS) nanofibers with two different degrees of deacetylation (DDA) were first successfully fabricated from its solution in 1% aqueous acetic acid solution by mixing with poly(vinyl alcohol) (PVA) solution at a weight ratio of 50/50 via the electrospinning method. Then, the CS/PVA membranes were further modified by glutaraldehyde vapor. The prepared nanofibers were characterized by field electron scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), the tensile test, the co

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18

Zhu, Wei, Xueliang Jiang, Fangjun Liu, Feng You, and Chu Yao. "Preparation of Chitosan—Graphene Oxide Composite Aerogel by Hydrothermal Method and Its Adsorption Property of Methyl Orange." Polymers 12, no. 9 (2020): 2169. http://dx.doi.org/10.3390/polym12092169.

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Graphene based aerogel has become one of the most likely functional adsorption materials that is applicable to purify various contaminated water sources, such as dye wastewater, because of its high porosity, structural stability, large specific surface area, and high adsorption capacity. In this study, chitosan and graphene oxide were first selected as the matrix to prepare the composite hydrogel through the hydrothermal method, which was further frozen and dried to obtain the target aerogel. The microscopic structures and adsorption capacity of the composite aerogel were then characterized by

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19

K. Ramakrishnan, Rohith, Vinod V. T. Padil, Stanisław Wacławek, Miroslav Černík, and Rajender S. Varma. "Eco-Friendly and Economic, Adsorptive Removal of Cationic and Anionic Dyes by Bio-Based Karaya Gum—Chitosan Sponge." Polymers 13, no. 2 (2021): 251. http://dx.doi.org/10.3390/polym13020251.

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A novel, lightweight (8 mg/cm3), conjugate sponge of karaya gum (Kg) and chitosan (Ch) has been synthesized with very high porosity (~98%) and chemical stability, as a pH-responsive adsorbent material for the removal of anionic and cationic dyes from aqueous solutions. Experimental results showed that Kg-Ch conjugate sponge has good adsorption capacity for anionic dye methyl orange (MO: 32.81 mg/g) and cationic dye methylene blue (MB: 32.62 mg/g). The optimized Kg:Ch composition grants access to the free and pH-dependent ionizable functional groups on the surface of the sponge for the adsorpti

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Agunos, Ricarl Irish F., Danilet Vi M. Mendoza, and Michael Angelo S. Rivera. "Anthocyanin Colorimetric Strip for Volatile Amine Determination." International Journal of Food Science 2020 (June 18, 2020): 1–7. http://dx.doi.org/10.1155/2020/1672851.

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Food freshness is one of the main concerns of consumers. Food spoilage is mainly caused by contamination and microbial growth in which the latter produces volatile amines in the process. Several methods have been used to determine volatile amines to indicate food freshness, and indicator films are deemed as the most time-efficient and economical. In this study, anthocyanin was extracted from mangosteen rind as a natural dye indicator and was incorporated in a chitosan/PVA polymer matrix. The film with different concentrations of anthocyanin extract (5%, 15%, and 25%) was prepared and tested fo

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Zhang, Yinglin, Yulin Shi, Bo Yan, et al. "Flocculant-Assisted Synthesis of Graphene-Like Carbon Nanosheets for Oxygen Reduction Reaction and Supercapacitor." Nanomaterials 9, no. 8 (2019): 1135. http://dx.doi.org/10.3390/nano9081135.

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The rational treatment of hazardous textile sludge is critical and challenging for the environment and a sustainable future. Here, a water-soluble chitosan derivative was synthesized and used as an effective flocculant in removal of reactive dye from aqueous solution. Employing these chitosan-containing textile sludges as precursors, graphene-like carbon nanosheets were synthesized through simple one-step carbonization with the use of Fe (III) salt as graphitization catalyst. It was found that the resultant graphene-like carbon nanosheets material at thickness near 3.2 nm (NSC-Fe-2) showed a h

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Ho, Trinh Thi Tuyet, Tam Thanh Mai, and Huy Duc Ha. "Synthesis of graphene/Fe3O4 nano composites." Science and Technology Development Journal 18, no. 2 (2015): 166–76. http://dx.doi.org/10.32508/stdj.v18i2.1182.

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In this work, we have demonstrated a coprecipitation method combined in situreduction method for the synthesis of graphene/magnetite nanocomposites (MRGO) and for its application in dye removal from aqueous media for the environmental water treatment. The Fe3O4 nano particles were synthesized by coprecipitation method, and water-soluble chitosan was used as surface-active substances to help the dispersion stability of Fe3O4 nano particles. In addition, graphene oxide (GO) was reduced into graphene by Lascorbic acid. The structure, morphology, and magnetic characteristics of the nanosized compo

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Mustafa, Alef, Aneta Tomescu, Emin Mustafa, Melat Cherim, and Rodica Sîrbu. "Polyelectrolyte Complexes Based on Chitosan and Natural Polymers." European Journal of Interdisciplinary Studies 2, no. 1 (2016): 100. http://dx.doi.org/10.26417/ejis.v2i1.p100-107.

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For many years chitosan has been the subject of interest for its use in different medical fields due to its appealing properties such as biocompatibility, biodegradability, low toxicity and relatively low production cost from abundant natural sources. Chitosan is positively charged at low pH values, so it is spontaneously associated with negatively charged polyions in solution to form polyelectrolyte complexes. These chitosan based polyelectrolyte complexes exhibit favourable physicochemical properties with preservation of chitosan’s biocompatible characteristics. These chitosan based complexe

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Mustafa, Alef, Aneta Tomescu, Emin Mustafa, Melat Cherim, and Rodica Sîrbu. "Polyelectrolyte Complexes Based on Chitosan and Natural Polymers." European Journal of Interdisciplinary Studies 4, no. 1 (2016): 100. http://dx.doi.org/10.26417/ejis.v4i1.p100-107.

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For many years chitosan has been the subject of interest for its use in different medical fields due to its appealing properties such as biocompatibility, biodegradability, low toxicity and relatively low production cost from abundant natural sources. Chitosan is positively charged at low pH values, so it is spontaneously associated with negatively charged polyions in solution to form polyelectrolyte complexes. These chitosan based polyelectrolyte complexes exhibit favourable physicochemical properties with preservation of chitosan’s biocompatible characteristics. These chitosan based complexe

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Pankova, Svetlana, Marina Holyavka, and Valeriy Artyukhov. "UV Sensitivity of Free and Immobilized on Chitosan Matrix Proteases." Chemistry Proceedings 2, no. 1 (2020): 17. http://dx.doi.org/10.3390/eccs2020-07610.

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UV irradiation is an essential factor in natural and artificial climate in modern environmental conditions, which has a constant effect on living systems. Collagenase, bromelain, ficin, papain (Sigma-Aldrich: St. Louis, MO, USA) and trypsin (MP biomedicals: Santa Ana, CA, USA) were the objects of this study. The substrate for hydrolysis was BSA (Sigma-Aldrich: St. Louis, MO, USA), the carriers for immobilization were chitosans (<100, 200 and 350 kDa) and chitosan succinate (Bioprogress: Shchyolkovo, Russia). The protease immobilization was carried out by the adsorption. The determination of

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Qi, Meng-Jie, Yong-Fang Qian, Yu-Ping Zhao, and Wei Ju. "Thermal behavior of electrospun gelatin and chitosan complex." Thermal Science 19, no. 4 (2015): 1323–26. http://dx.doi.org/10.2298/tsci1504323q.

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This paper studied the thermal behavior of gelatin, chitosan, and their complex. Thermal stability was analyzed by thermogravimetric analysis, and the results showed that gelatin and chitosan raw materials exhibited two decomposition stages while as-electrospun nanofibrous mats had three decomposition stages. Moreover, chitosan raw material had better thermal stability than gelatin. However, its electrospun partner revealed its opposite trend. X-ray diffraction was used to analyze the crystalline property and the result showed that the crystallinity decreased due to the interaction with the so

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Atmaja, Lukman, Mochammad Purwanto, Muhammad Taufiq Salleh, et al. "GPTMS-Montmorillonite-filled biopolymer chitosan membrane with improved compatibility, physicochemical, and thermal stability properties ochemical and thermal stability properties." Malaysian Journal of Fundamental and Applied Sciences 15, no. 4 (2019): 492–97. http://dx.doi.org/10.11113/mjfas.v15n4.1196.

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The chitosan/organo-montmorillonite (Ch/O-MMT) membrane was fabricated and tested. Surface modification of O-MMT particles using 3-glicydoxy propyl trimethoxysilane (GPTMS) to enhance its compatibility with chitosan is presented. The resulting composite membrane was characterized by using SEM, AFM, and FTIR to observe the morphological and functional group structure. The crystallinity, thermal stability, and mechanical strength was analyzed by XRD, TGA, and tensile test. The results suggested that the modification of MMT using GPTMS could increase the compatibility of O-MMT with chitosan membr

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Triyana, Kuwat, M. Solihul Mu’min, Kuni Faizah, Yusril Yusuf, Ahmad Kusumaatmaja, and Harsojo. "Electrospun Nanofibers Based on Polyvinyl Alcohol/Chitosan and its Stability in KOH Solution." Materials Science Forum 827 (August 2015): 321–25. http://dx.doi.org/10.4028/www.scientific.net/msf.827.321.

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Fabrication of nanofibers based on polyvinyl alcohol and chitosan (PVA/chitosan) has been carried out by means of electrospinning with focusing on beads formation and diameter variation due to effects of weight ratio variations of PVA/chitosan. For electrospinning solution, the PVA/chitosan with artios of 10:1, 10:2 and 10:3 w/w were dissolved in 1% acetic acid. In addition, stability testing of PVA/chitosan nanofibers in an electrolyte solution was performed by soaking the nanofiber mat in KOH solution. As results, the addition of chitosan concentration increased the pH, conductivity, and vis

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Tajdidzadeh, M., B. Z. Azmi, W. Mahmood M. Yunus, et al. "Synthesis of Silver Nanoparticles Dispersed in Various Aqueous Media Using Laser Ablation." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/324921.

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The particle size, morphology, and stability of Ag-NPs were investigated in the present study. A Q-Switched Nd: YAG pulsed laser (λ= 532 nm, 360 mJ/pulse) was used for ablation of a pure Ag plate for 30 min to prepare Ag-NPs in the organic compound such as ethylene glycol (EG) and biopolymer such as chitosan. The media (EG, chitosan) permitted the making of NPs with well dispersed and average size of Ag-NPs in EG is about 22 nm and in chitosan is about 10 nm in spherical form. Particle size, morphology, and stability of NPs were compared with distilled water as a reference. The stability of th

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Satheesh, Britto, Kim Yeow Tshai, and Nick Warrior. "Thermal and Morphological Properties of Chitosan Filled Epoxy." Applied Mechanics and Materials 627 (September 2014): 12–17. http://dx.doi.org/10.4028/www.scientific.net/amm.627.12.

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This paper investigates the effects of polysaccharide additive agent on the morphological and thermal properties of thermosetting polymer. The weight percentage (wt%) of Diglycidyl Ether of Bisphenol A (DGEBA) epoxy resin to Hexamethylenediamine (HMDA) hardener were kept constant while a varyingwt% of chitosan, ranging from 0 to 10wt% was introduced. The chitosan filled epoxy hardener mixture was allowed to cure at 40°C for a period of 12 hours. Dynamic Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA) were conducted on the specimens to analyse the effects of chitosan loading o

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Xu, Yu Ting, Li Chun Dong, Da Fu Huang, Yan Xiao, and Xiao Hua Zhou. "Immobilization of Glucose Oxidase on L-lysine Modifided Chitosan." Advanced Materials Research 236-238 (May 2011): 909–12. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.909.

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A L-lysine modified semi-crosslinked chitosan (LMCCT) beads was synthesized and demonstrated to be an excellent enzyme support by studying the enzymatic properties of glucose oxidases (GODs) immobilized on it. The prepared LMCCT beads have very larger BET specific surface ( 403 m2/g) and excellent chemical stability due to the semi-crosslinking of chitosan backbones. The insertion of the flexible L-lysine spacers between chitosan backbone and the active amino groups increases the activity of immobilized GODs (I-GODs) and improves the affinity of I-GODs towards the substrate, which was testifie

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Özdemir, Kübra Sultan, and Vural Gökmen. "Effect of Chitosan-Ascorbic Acid Coatings on the Refrigerated Storage Stability of Fresh-Cut Apples." Coatings 9, no. 8 (2019): 503. http://dx.doi.org/10.3390/coatings9080503.

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Using natural antimicrobial substances in edible films becomes crucial to extend the shelf-life of fresh-cut fruits due to the consumers’ preferences. In this study chitosan and ascorbic acid based film was used to improve the shelf-life of fresh-cut apples. Fresh-cut apple cubes were dipped in water (control), ascorbic acid (1%) or mixtures of chitosan–ascorbic acid in different ratios (1%:1%, 2%:2% or 1%:5%) for 5 min. After draining, fresh-cut apples were packed in sterile polypropylene jars and stored at 5 °C for 14 days. The treatment with chitosan and ascorbic acid suppressed browning, r

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Quan, Wei-Yan, Song-Zhi Kong, Si-Dong Li та ін. "Grafting of 18β-Glycyrrhetinic Acid and Sialic Acid onto Chitosan to Produce a New Amphipathic Chitosan Derivative: Synthesis, Characterization, and Cytotoxicity". Molecules 26, № 2 (2021): 452. http://dx.doi.org/10.3390/molecules26020452.

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Chitosan is the only cationic polysaccharide found in nature. It has broad application prospects in biomaterials, but its application is limited due to its poor solubility in water. A novel chitosan derivative was synthesized by amidation of chitosan with 18β-glycyrrhetinic acid and sialic acid. The chitosan derivatives were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and measurement of the zeta potential. We also investigated the solubility, cytotoxicity, and blood compatibility of chitosan derivatives. 18β-glycyrrhetinic acid and sialic acid could be

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Tanjung, Faisal Amri, Yalun Arifin, Abdul Hamid Abdullah, and Iqmal Tahir. "Bilayer-Structured Regenerated Cellulose/Chitosan Films Prepared with Ionic Liquid." Indonesian Journal of Chemistry 17, no. 3 (2017): 351. http://dx.doi.org/10.22146/ijc.24310.

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The effects of chitosan on properties of regenerated cellulose/chitosan (RC/Ch) films were investigated. The films were prepared using a sequence process of solution-casting in a lithium chloride/N,N-dimethylacetamide ionic liquid, and coagulation in water. Due to the amorphous structure of chitosan and the formation of hydrogen bonding between the functional groups of the both components, tensile strength of the films decreased considerably; however, elongation at break increased. Furthermore, SEM morphology indicated a visible separated layers comprising of rigid and ductile surfaces. The ad

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Lou, Ching Wen, Jin Jia Hu, Chao Tsang Lu, Chao Chiung Huang, Ming Sheng Huang, and Jia Horng Lin. "Manufacturing of Functional Gelatin/Chitosan Composite Membrane." Advanced Materials Research 287-290 (July 2011): 150–53. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.150.

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Biodegradable materials have gained more and more attention, especially in biomedical fields. Because of their degradability, biomedical products made of these biodegradable materials can reduce the deleterious impact to the environment. Among other biodegradable polymers, gelatin has been used in wound dressing to accelerate wound healing due to its biocompatibility, film formability and hemostatic activity. In this study, we used gelatin as the matrix for our dressing. As gelatin is prone to degrade/dissolve in water at body temperature, it has to be cross-linked or stabilized with other com

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ARULANANDRAJ, N., V. Gopal, S. Dhivya, and G. Jayabalan. "NANOTECHNOLOGICAL APPROACH TO ENHANCE THE STABILITY AND BIOAVAILABILITY OF THE HERBAL DRUG "MURVA"." Journal of Drug Delivery and Therapeutics 8, no. 5 (2018): 251–56. http://dx.doi.org/10.22270/jddt.v8i5.1823.

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Murva (Maerua oblongifolia) contains numerous bioactive compounds that may provide multiple health benefits, including anti-microbial, anti-fungal, anti-pyretic and anti-diabetic. Most of the therapeutic effects of murva have been attributed due to the presence of triterpenoids and alkaloids, in their composition. Although these compounds have been shown promising therapeutic effects under in-vitro conditions, they met with limited efficacy in clinical settings due to various reasons such as poor oral absorption and bioavailability. Different techniques have been proposed to improve the stabil

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Mansour, Nahla A., Sahar M. Ahmed, and Azza M. Mazrouaa. "Chitosan-g-poly (acrylonitrile-co-acrylic acid) for wastewater treatment application." Mediterranean Journal of Chemistry 9, no. 6 (2020): 447–55. http://dx.doi.org/10.13171/mjc9602001061110am.

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Chitosan is a biodegradable natural based polymer obtained from chitin (N-deacetylated derivative), the second most abundant polysaccharide after cellulose and soluble in most organic acids. Graft copolymerization of poly (acrylonitrile-co-acrylic acid) onto chitosan has been successfully carried out using potassium persulfate as an initiator in an aqueous medium. The PAN and PAA homopolymer formed during the reaction were removed from the Chitosan grafted copolymer by Soxhlet extraction using ethanol as the solvent. The prepared graft copolymerization was characterized by Fourier transform in

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Awadallah-F, Ahmed, and Shaheen A. Al-Muhtaseb. "Influence of Chitosan Addition on Resorcinol–Formaldehyde Xerogel Structure." Applied Sciences 9, no. 21 (2019): 4582. http://dx.doi.org/10.3390/app9214582.

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Gels are usually not environment-friendly due to their difficult biodegradability. Therefore, the addition of chitosan, even in small amounts, will make such gels biodegradable and thus can be useful in many applications that require environment-friendly materials. The addition of small quantities of chitosan to the reacting solution resorcinol–formaldehyde xerogel was investigated. Different hybrid resorcinol–formaldehyde–chitosan xerogels were characterized by different techniques, including Raman spectra, FTIR, XRD, TGA, SEM, surface area and porosity analyzer, and CHNS/O microanalyzer. It

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Zemskova, Larisa, Andrei Egorin, Eduard Tokar, Vladimir Ivanov, and Svetlana Bratskaya. "New Chitosan/Iron Oxide Composites: Fabrication and Application for Removal of Sr2+ Radionuclide from Aqueous Solutions." Biomimetics 3, no. 4 (2018): 39. http://dx.doi.org/10.3390/biomimetics3040039.

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Here, we discuss the fabrication and problems of application of chitosan-based composite materials for the removal of hazardous metal ions from tap water and wastewater. The chitosan-based composites containing iron oxides for the uptake of Sr2+ ions were fabricated via a co-precipitation method with variation of the iron/chitosan ratio and pH of the medium. The morphology and composition of the fabricated sorbents were characterized using scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX) and X-ray diffraction (XRD) analysis. We have shown that the suggested fabricati

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WANG, XIAOLIANG, XIANG LI, ELEANOR STRIDE, and MOHAN EDIRISINGHE. "FABRICATION OF NANOPOROUS CHITOSAN MEMBRANES." Nano 05, no. 01 (2010): 53–60. http://dx.doi.org/10.1142/s1793292010001846.

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Naturally derived biopolymers have been widely used for biomedical applications such as drug carriers, wound dressings, and tissue engineering scaffolds. Chitosan is a typical polysaccharide of great interest due to its biocompatibility and film-formability. Chitosan membranes with controllable porous structures also have significant potential in membrane chromatography. Thus, the processing of membranes with porous nanoscale structures is of great importance, but it is also challenging and this has limited the application of these membranes to date. In this study, with the aid of a carefully

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Аbilova, Guzel, Danelya Makhayeva, Galiya Irmukhametova, and Vitaliy Khutoryanskiy. "Chitosan based hydrogels and their use in medicine." Chemical Bulletin of Kazakh National University, no. 2 (June 5, 2020): 16–28. http://dx.doi.org/10.15328/cb1100.

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Chitosan is a natural biopolymer, polysaccharide, a product of chitin deacetylation. Chitosan is a non-toxic, biocompatible and biodegradable polymer with high biological activity and stability in the environment. In addition, chitosan is obtained from natural renewable resources and is an inexpensive substance. Due to all these properties, chitosan is widely used in practical medicine, for example, in the form of hydrogel dosage forms in combination with natural and synthetic polymers. This review is focused on polymer hydrogel materials based on chitosan. Special attention is paid to the pre

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Liu, Mingyang, Yanjun Chen, Chaoran Qin, et al. "Electrodeposition of reduced graphene oxide with chitosan based on the coordination deposition method." Beilstein Journal of Nanotechnology 9 (April 17, 2018): 1200–1210. http://dx.doi.org/10.3762/bjnano.9.111.

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The electrodeposition of graphene has drawn considerable attention due to its appealing applications for sensors, supercapacitors and lithium-ion batteries. However, there are still some limitations in the current electrodeposition methods for graphene. Here, we present a novel electrodeposition method for the direct deposition of reduced graphene oxide (rGO) with chitosan. In this method, a 2-hydroxypropyltrimethylammonium chloride-based chitosan-modified rGO material was prepared. This material disperses homogenously in the chitosan solution, forming a deposition solution with good dispersio

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Wu, Yuanbing, Ania Rashidpour, María Pilar Almajano, and Isidoro Metón. "Chitosan-Based Drug Delivery System: Applications in Fish Biotechnology." Polymers 12, no. 5 (2020): 1177. http://dx.doi.org/10.3390/polym12051177.

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Chitosan is increasingly used for safe nucleic acid delivery in gene therapy studies, due to well-known properties such as bioadhesion, low toxicity, biodegradability and biocompatibility. Furthermore, chitosan derivatization can be easily performed to improve the solubility and stability of chitosan–nucleic acid polyplexes, and enhance efficient target cell drug delivery, cell uptake, intracellular endosomal escape, unpacking and nuclear import of expression plasmids. As in other fields, chitosan is a promising drug delivery vector with great potential for the fish farming industry. This revi

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Terzioglu, Pınar, Yasin Altin, Ayse Kalemtas, and Ayse Celik Bedeloglu. "Graphene oxide and zinc oxide decorated chitosan nanocomposite biofilms for packaging applications." Journal of Polymer Engineering 40, no. 2 (2020): 152–57. http://dx.doi.org/10.1515/polyeng-2019-0240.

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AbstractRecently, due to sustainable development and environmental protection policies, there is increasing interest in the development of new biodegradable polymer-based multifunctional composites. Chitosan is one of the most remarkable and preferred biopolymers, which is environmentally friendly as well as renewable, biocompatible, and inexpensive. Though it has a wide range of potential applications, the major limitation of chitosan – the problem of poor mechanical performance – needs to be solved. In this work, graphene oxide was first produced and then used to manufacture a chitosan/graph

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Kim, Ga Hee, Jung Nam Im, Tae Hee Kim, Gyu Dong Lee, Ji Ho Youk, and Song Jun Doh. "Preparation and characterization of calcium carboxymethyl cellulose/chitosan blend nonwovens for hemostatic agents." Textile Research Journal 88, no. 16 (2017): 1902–11. http://dx.doi.org/10.1177/0040517517712101.

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Wet-laid blend nonwovens of calcium carboxymethyl cellulose fibers and chitosan powder were prepared as a new efficacious hemostatic agent, and their water absorption behavior, rupture strength in the dry and wet states, blood clotting properties, calcium ion release behavior, and cytotoxicity were investigated. The calcium carboxymethyl cellulose and chitosan nonwovens lost their structural integrity in the wet state due to water absorption and subsequent gelation, whereas the calcium carboxymethyl cellulose/chitosan blend nonwovens maintained their structural integrity. The formation of poly

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Tanjung, Faisal Amri, Salmah Husseinsyah, Kamarudin Hussin, and Iqmal Tahir. "CHEMICALLY CHITOSAN MODIFIED WITH METHYL METHACRYLATE AND ITS EFFECT ON MECHANICAL AND THERMAL PROPERTIES OF POLYPROPYLENE COMPOSITES." Indonesian Journal of Chemistry 13, no. 2 (2013): 114–21. http://dx.doi.org/10.22146/ijc.21293.

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Effects of methyl methacrylate on the properties of chitosan-filled polypropylene (PP) composites has been investigated. Mechanical and thermal properties of the composites were analyzed according to ASTM D 638-91, thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC). The results showed that tensile strength of PP composites decreased upon the addition of chitosan, while Young's modulus improved. At a similar filler loading, the treated PP/chitosan composites were found to have higher tensile strength and Young's modulus as compared with the untreated composites. Thermal

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Rodolfo, Carlos, Dalinda Eusébio, Cathy Ventura, et al. "Design of Experiments to Achieve an Efficient Chitosan-Based DNA Vaccine Delivery System." Pharmaceutics 13, no. 9 (2021): 1369. http://dx.doi.org/10.3390/pharmaceutics13091369.

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In current times, DNA vaccines are seen as a promising approach to treat and prevent diseases, such as virus infections and cancer. Aiming at the production of a functional and effective plasmid DNA (pDNA) delivery system, four chitosan polymers, differing in the molecular weight, were studied using the design of experiments (DoE) tool. These gene delivery systems were formulated by ionotropic gelation and exploring the chitosan and TPP concentrations as DoE inputs to maximize the nanoparticle positive charge and minimize their size and polydispersity index (PDI) as DoE outputs. The obtained l

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Vrabič Brodnjak, Urška, and Katarina Tihole. "Chitosan Solution Containing Zein and Essential Oil as Bio Based Coating on Packaging Paper." Coatings 10, no. 5 (2020): 497. http://dx.doi.org/10.3390/coatings10050497.

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Modifications of the packaging paper surface play an important role in a variety of industries, especially in the food sector. Uncoated paper has poor water and oil barrier properties due to its porous structure. In this study, packaging paper was successfully coated with six different coating solutions containing combinations of chitosan, zein and rosemary essential oil. The chitosan and zein were actually coated in two layers; the mixed chitosan–rosemary oil and the mixed zein–rosemary oil were each applied as one layer to the paper. The results showed increased oil barrier properties in the

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Kan, C. W., C. W. M. Yuen, W. Y. Tsoi, and C. K. Chan. "Ink-jet printing for Plasma-treated Cotton Fabric with Biomaterial." ASEAN Journal of Chemical Engineering 11, no. 1 (2011): 1. http://dx.doi.org/10.22146/ajche.50037.

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Currently, sodium alginate is commonly used for preparing the printing medium for digital ink-jet printing due to its ready solubility and excellent stability even at high-temperature fixation treatments. Similar to sodium alginate, chitosan is also widely used as novel biomaterial. As a natural polymer, sodium alginate and chitosan are biocompatible, biodegradable and non-toxic. Therefore, chitosan may be used as a chemical for preparing printing medium for digital ink-jet printing for cotton fabric. Recently, low temperature plasma (LTP) treatment has proved to be an effective pretreatment m

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Maevskaia, Ekaterina N., Oksana P. Kirichuk, Sergei I. Kuznetzov, Elena N. Dresvyanina, Vladimir V. Yudin, and Pierfrancesco Morganti. "Hemocompatible Chitin-Chitosan Composite Fibers." Cosmetics 7, no. 2 (2020): 28. http://dx.doi.org/10.3390/cosmetics7020028.

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Composite chitosan fibers filled with chitin nanofibrils (CNF) were obtained by the wet spinning method. The paper discusses the mechanical properties of such type fibers and their hemocompatibility, as well as the possibility of optimizing these properties by adding chitin nanofibrils. It was shown that low CNF concentration (about 0.5%) leads to an increase in fiber tensile strength due to the additional orientation of chitosan macromolecules. At the same time, with an increase in the content of CNF, the stability of the mechanical properties of composite fibers in a humid medium increases.

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