Relevant bibliographies by topics / O-carboxymethyl chitosan

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'O-carboxymethyl chitosan'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "O-carboxymethyl chitosan"

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Jaidee, A., Pornchai Rachtanapun, and S. Luangkamin. "1H-NMR Analysis of Degree of Substitution in N,O-Carboxymethyl Chitosans from Various Chitosan Sources and Types." Advanced Materials Research 506 (April 2012): 158–61. http://dx.doi.org/10.4028/www.scientific.net/amr.506.158.

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N,O-Carboxymethyl chitosans were synthesized by the reaction between shrimp, crab and squid chitosans with monochloroacetic acid under basic conditions at 50°C. The mole ratio of reactants was obtained from various reaction conditions of shrimp chitosan polymer and oligomer types. The mole ratio 1:12:6 of chitosan:sodium hydroxide:monochloroacetic acid was used for preparing carboxymethyl of chitosan polymer types while carboxymethyl of chitosan oligomer types were used the mole ratio 1:6:3 of chitosan:sodium hydroxide:monochloroacetic acid. The chemical structure was analyzed by fourier transformed infrared spectroscopy (FT-IR) and proton nuclear magnatic resonance spectroscopy (1H-NMR). The FT-IR was used for confirm the insertion of carboxymethyl group on chitosan molecules. The 1H-NMR was used for determining the degree of substitution (DS) of carboxymethylation at hydroxyl and amino sites of chitosans. Carboxymethyl chitosan samples had the total DS of carboxymethylation ranging from 1.0-2.2. The highest of DS of carboxymethylation was from shrimp chitosan oligomer type.
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Liu, Qili, Jianxin Zhang, Dong Li, Jianfeng Lang, Shasha Zai, Jianjun Hao, and Xiaohui Wang. "Inhibition of Amphiphilic N-Alkyl-O-carboxymethyl Chitosan Derivatives on Alternaria macrospora." BioMed Research International 2018 (June 11, 2018): 1–9. http://dx.doi.org/10.1155/2018/5236324.

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Cotton leaf spot (Alternaria macrospora) is a widespread disease that occurs in the main cotton-producing area of China. In managing this disease, a novel chitosan-based biopesticide, an amphiphilic N-alkyl-O-carboxymethyl chitosan derivative, was prepared. The product was selected from variations of chitosan with different molecular structures, which were obtained via a two-step reaction. First, carboxymethyl chitosans with varying molecular sizes were obtained by etherification with chloroacetic acid; then the carboxymethyl chitosan was alkylated with C4–C12 fatty aldehyde through a Schiff-base reaction. This procedure resulted in derivatives of amphiphilic N-alkyl-O-carboxymethyl chitosan, which showed strong antifungal activities against A. macrospora, and the efficacy was determined by its molecular structure.
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Zhou, Gang, Jing Zhang, Jun Tai, Qianyi Han, Lei Wang, Kunpeng Wang, Shengcai Wang, and Yubo Fan. "Comparison of chitosan microsphere versus O-carboxymethyl chitosan microsphere for drug delivery systems." Journal of Bioactive and Compatible Polymers 32, no. 5 (February 1, 2017): 469–86. http://dx.doi.org/10.1177/0883911517690757.

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The development of controlled drug delivery systems for bone regeneration, especially microspheres, has become a research hotspot in recent years. Chitosan and its derivative O-carboxymethyl chitosan have been considered to be an effective way for controlled drug delivery due to their nontoxicity and biodegradability. Currently, most of the studies have researched on synthesizing and characterizing chitosan and O-carboxymethyl chitosan. However, few studies have focused on the differences between chitosan microspheres and O-carboxymethyl chitosan microspheres directly. In this study, chitosan and O-carboxymethyl chitosan microspheres were developed by water-in-oil emulsification cross-linking method using vanillin as the cross-linking agent, and then their physicochemical properties were evaluated by Fourier transform infrared spectroscopy, scanning electron microscopy, and in vitro release testing. The results showed that O-carboxymethyl chitosan was successfully modified by adding carboxymethyl group at the chitosan C6 position.The particle size of chitosan microspheres (50–90 µm) was significantly larger than that of O-carboxymethyl chitosan microspheres (10–50 µm), and the drug release profile of O-carboxymethyl chitosan microspheres showed larger initial burst release within the first day and sustained release at the fourth day, while chitosan microspheres showed sustained release at the seventh day. In addition, Cell Counting Kit-8 assay showed that MC3T3-E1 proliferated well and highly expressed the alkaline phosphatase marker protein on both chitosan and O-carboxymethyl chitosan microspheres. Overall, both chitosan and O-carboxymethyl chitosan microspheres showed good biocompatibility, and chitosan microspheres were superior to O-carboxymethyl chitosan microspheres. Moreover, the different drug release rates suggest that chitosan and O-carboxymethyl chitosan microspheres have the potential to be used for the repair of different bone defects.
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Lu, Xi, Juan Qin Xue, Yu Jie Wang, Wei Bo Mao, Ming Wu, and Jing Xian Li. "Theoretical Studies on the Chemical Structure of Carboxymethyl Chitosan." Advanced Materials Research 160-162 (November 2010): 1822–27. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1822.

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The density functional theory (DFT) calculations explored the structural optimization and the frequency of N-carboxymethyl chitosan (N-CMCS) and O-carboxymethyl chitosan (O-CMCS). For the isomers, the calculations comparatively were performed. The charge distribution and frontier molecular orbit were analyzed by using the natural bond orbital (NBO) method. The results showed: the two rotational isomers a and b can stably exist, with the stability order a>b; N-carboxymethyl chitosan reaction active sites are concentrated in -OH and -NHCH2COOH, while O-carboxymethyl chitosan reaction active sites are concentrated in -NH2 and -CH2COOH; The water-soluble mechanism of carboxymethyl chitosan was investigated deeply, on the one hand, the presence of carboxymethyl of carboxymethyl chitosan had a tendency to ionize H+, on the other hand the carboxymethyl increased the distance and weakened the hydrogen bonds between molecules, even though Einstein shift H-bond is formed in the carboxymethyl chitosan molecules.
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Bazat, Mohamad Radawn, Mohamad Yahay Zien AL-deen, and Hasan AL-Khamisy. "Grafting of O-Carboxymethyl Chitosan with Acrylonitrile and Studying some of its Properties and Applications." Association of Arab Universities Journal of Engineering Sciences 28, no. 2 (June 30, 2021): 86–94. http://dx.doi.org/10.33261/jaaru.2021.28.2.009.

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Preparation of o-carboxymethyl Chitosan was done, wich is important derivative of chitosan. Grafting copolymerization of acrylonitrile onto o-carboxymethyl chitosan was accomplished using ammonium cerium sulfate (CAS) as an initiator. Resulting graft of o-carboxymethyl chitosan was characterized by FT-IR spectrum and DTA analysis to be compared with o-carboxymethyl chitosan. Properties such as water swelling and solubility were studied for each, whereas,. Percentage of grafting efficiency (GE%) and yield of grafting (GY%) were determined. The efficiency of grafted ocarboxymethyl chitosan (CMCh-g-PAN) to remove dyes(direct black dyes, dispersed red dyes) from industrial waste water was also determined. The results reveal good efficient absorption of black dyes more than red dyes. Efficiency from different concentrations of grafted o-carboxymethyl chitosan(CMCh-g-PAN) to reveal percentages of elimination ions from their solutions metallic ions Cu2+,Pb2+,Cd2+and Sn2+ from their solutions at room temperature with mechanical stirring for 24 hrs were also determined .It has been shown that grafted o-carboxymethyl chitosan has important role in elimination of lead ion comparing with other ions, As a result, elimination percentages of ions increase as follow: Cd2+< Sn2+< Cu2+<. Pb2+
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Anitha, A., V. V. Divya Rani, R. Krishna, V. Sreeja, N. Selvamurugan, S. V. Nair, H. Tamura, and R. Jayakumar. "Synthesis, characterization, cytotoxicity and antibacterial studies of chitosan, O-carboxymethyl and N,O-carboxymethyl chitosan nanoparticles." Carbohydrate Polymers 78, no. 4 (November 2009): 672–77. http://dx.doi.org/10.1016/j.carbpol.2009.05.028.

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Shang, Xiao Xian, Jiao Du, and Hong Yan Zhang. "The Preparation of O-Carboxymethyl-Chitosan and its Particles." Advanced Materials Research 490-495 (March 2012): 3782–85. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.3782.

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The active site of chitosan is protected basing on amino reaction method of reaction between benzaldehyde and chitosan to form Schiff. The O-carboxymethyl chitosan is obtained by the method that taking chloroactic acid to hydroxyl of chitosan as modifier in alkaline conditions to form amino protection and then remove the protection in acid conditions. The O-carboxymethyl chitosan particles with particle size distribution of 15-50μm is prepared by emulsification cross- linking method.
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Liao, Xiao Ling, Yan Liu, Qiu Hong Huang, and Wen Feng Xu. "The Research on the Adsorbing Behavior of Chitosan for Heavy Metal Ions." Applied Mechanics and Materials 320 (May 2013): 649–53. http://dx.doi.org/10.4028/www.scientific.net/amm.320.649.

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Chitosan and N,O-carboxymethyl chitosan are non-toxic natural absorbents. In this paper, the adsorbing behavior of Chitosan and O, N-carboxymethyl Chitosan for Co2+ respectively were studied. The result indicated that the adsorbing ability of N,O-carboxymethyl chitosan was better than this of chitosan. The adsorbing ratio increased clearly with the increasing in the pH value of solution and absorbent amount, but it was not sensitive to the concentration of Co2+. Within ten minutes, the adsorbing ratio of above absorbents could achieve above 80%. But with time prolonging, the adsorbing ratio increased slowly. When time was more than 15 minutes and the pH value was higher than 10, the adsorption rate slowly flatted out.
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Widiyanti, Prihartini, Yolanda Citra Ayu Priskawati, Herry Wibowo, and Jan Ady. "Development of Aldehyde Hyaluronic Acid - N,O-Carboxymethyl Chitosan based Hydrogel for Intraperitoneal Antiadhesion Application." Journal of Biomimetics, Biomaterials and Biomedical Engineering 52 (August 10, 2021): 47–54. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.52.47.

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Intraperitoneal adhesion is a serious case that often occurs with a prevalence of 90-97 % after undergoing gynecological surgery and laparotomy. This study aims are to characterized the hydrogel and identified the optimal composition of Hyaluronic acid (HA) - N, O-carboxymethyl chitosan (NOCC) as an anti-adhesion biomaterial barrier. The synthesis method involved firstly the synthesis of aldehyde derivative of hyaluronic acid (AHA) and also the conversion of chitosan into its derivative, N,O-carboxymethyl chitosan. These two compounds were mixed in various compositions and crosslinked to form N, O-carboxymethyl chitosan (NOCC) /AHA. Fourier-transform infrared spectroscopy has confirmed that the functional groups found -C = O stretching at 1644 cm-1 indicating the hyaluronic acid and carboxymethyl group (-CH2COOH) in 1380 cm-1 which indicate the presence of chitosan. The crosslink is evidenced by the group C = N stretching at a wavenumber of about 1630 cm-1. The best composition of intraperitoneal anti-adhesion is the ratio of hyaluronic acid: chitosan at 30:10 mg/ml. The swelling test is showed a swelling ratio of around 211.8 % in accordance with the standard as intraperitoneal anti-adhesion. Hydrogel has a degradation rate up to 86.87 % on day 10, and this is in accordance with the standard as intraperitoneal anti-adhesion. Cytotoxicity assay showed that hydrogel was nontoxic with a percentage of 92.9 % cell viability. The newly developed hyaluronic acid-carboxymethyl chitosan has characteristics that conform to the criteria of an intraperitoneal anti-adhesion.
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Liu, Ying, Di Zhao, and Jiang Tao Wang. "Preparation of O-Carboxymethyl Chitosan by Schiff Base and Antibacterial Activity." Advanced Materials Research 647 (January 2013): 794–97. http://dx.doi.org/10.4028/www.scientific.net/amr.647.794.

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A novel method of preparation O-Carboxymethyl chitosan (OCMC) was studied that the product was prepared by reaction of Schiff's base of chitosan. Schiff base of chitosan (BCTS) was synthesized by the reaction of chitosan with aromatic aldehyde, then BCTS reacted with chloroacetic acid and removed the group of amino protection to get the target product. The chitosan derivative was characterized by FT-IR spectroscopy, 1HNMR and elemental analysis. Elemental analysis results confirmed that the degree of substitution(DS) of OCMC was 0.83. Solubility of OCMC in water and organic solvents was demonstrated to be better than that of chitosan. The antimicrobial activities of chitosan and OCMC were investigated against Aspergillus niger and Staphylococcus aureus. The results indicate that the antimicrobial activity of OCMC was superior to chitosan.
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Dissertations / Theses on the topic "O-carboxymethyl chitosan"

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Oberholzer, Ian Dewald. "Evaluation of the enzyme inhibitory effect of carboxymethylated chitosan / Ian Dewald Oberholzer." Thesis, North-West University, 2003. http://hdl.handle.net/10394/245.

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Degradation of peroral administered drugs by various enzymes in the gastrointestinal tract has proven to be troublesome for the absorption' and bioavailability of protein and peptide drugs. Mucoadhesive polymers such as poly(acrylates) have proven to inhibit protease enzymes responsible for initiating digestion of peptide drugs. Enzyme inhibitors have unique chemical properties enabling it to interact with enzymes to form complexes with such enzymes prohibiting it from functioning properly. Anionic carboxymethylated chitosan derivatives such as N,N-dicarboxymethyl chitosan and N, O-carboxymethyl chitosan display unique structural similarities to enzyme inhibitors being anionic polymers that may interact with bi-valent cations...
Thesis (M.Sc. (Pharm.))--North-West University, Potchefstroom Campus, 2004.
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LIN, Cheng-wei, and 林政衛. "Preparation of N,O-carboxymethyl Chitosan Nanoparticle as an Insulin Carrier." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67647655940267538496.

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碩士
國立雲林科技大學
化學工程與材料工程研究所
95
The aim of this research is to Preparation N,O-carboxymethyl chitosan (NOCC)which is derivative of chitosan. Insulin- N,O-carboxymethyl chitosan nanoparticle were prepared by ionic gelation of N,O- carboxymethyl chitosan and tripolyphosphate pentasodium(TPP). The NOCC/TPP mass ratio and insulin initial concentration were studied and how influence insulin release phenomena. The physicochemical properties of nanoparticles were determined by particle size, zeta potential analysis, transmission electron microscope, FTIR, SS-NMR and XRD. Release study was conducted by in vitro investigation to simulate intestinal fluid and gastric fluid at 37℃. Insulin release were analysed by RP-HPLC. The result shows particles size increased with increasing NOCC/TPP mass ratio. All nanoparticles prepared by ionic gelation which zeta potential was positive. Release rate were decreased with decreasing NOCC/TPP mass ratio and increased with decreasing insulin initial concentration. The release profiles were fitted very well by the Higuchi release model.
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Book chapters on the topic "O-carboxymethyl chitosan"

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Miura, Yoshiaki, Yoshihiro Kaneda, Yasumitsu Uraki, and Seiichi Tokura. "Stabilization of Drug Linked Peptides By 6-O-Carboxymethyl-Chitin." In Advances in Chitin and Chitosan, 116–24. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-5942-5_15.

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Nguyen, Tien Ngoc-Thuy, Dat Tan Nguyen, Vo Van Toi, and Thi-Hiep Nguyen. "Synthesis of N,O-Carboxymethyl Chitosan-Aldehyde Hyaluronic Acid Hydrogel Loading Silver Nanoparticles." In IFMBE Proceedings, 179–82. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5859-3_30.

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Huang, Qi, Feng Cao, and Dong Xu Li. "Preliminary Study on the Biocompatibility of Calcium Phosphate Bone Cement Containing N,O-Carboxymethyl Chitosan." In Key Engineering Materials, 807–10. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-422-7.807.

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An, Le Nguyen My, Nguyen Thanh Truc, Vo Ngoc My Tuyen, Vo Van Toi, and Thi-Hiep Nguyen. "Fabrication of N,O Carboxymethyl Chitosan (NOCC)—Aldehyde Hyaluronic Acid (AHA)—Biphasic Calcium Phosphate (BCP)—Poly (Vinyl Phosphonic Acid) (PVPA) Hydrogel for Bone Regeneration." In IFMBE Proceedings, 283–87. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5859-3_50.

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Conference papers on the topic "O-carboxymethyl chitosan"

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"Tumoricidal Effect of O-Carboxymethyl Chitin, N,O-Carboxymethyl Chitosan and 2-Phtalimido Chitin Evaluation with Human Tumour Cell Line." In International Institute of Chemical, Biological & Environmental Engineering. International Institute of Chemical, Biological & Environmental Engineering, 2015. http://dx.doi.org/10.15242/iicbe.c0615006.

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