Blend fibers of polyacrylonitrile and water-soluble chitosan derivative prepared from sodium thiocyanate solution

2001 ◽  
Vol 82 (7) ◽  
pp. 1620-1629 ◽  
Author(s):  
Chang-Woo Nam ◽  
Young Ho Kim ◽  
Sohk Won Ko
Keyword(s):  
Water Soluble ◽  
Sodium Thiocyanate ◽  
Chitosan Derivative ◽  
Thiocyanate Solution

Hierarchy in the Avidity and Cross-reactivity of Anti-citrullinated Protein Antibodies in the Serum of Patients With Rheumatoid Arthritis

2020 ◽  
Author(s):  
Akihisa Haraguchi ◽  
Hisakata Yamada ◽  
Takahide Sakuragi ◽  
Tomomi Tsuru ◽  
Masakazu Kondo ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Immune Response ◽  
Serum Antibody ◽  
Cross Reactivity ◽  
Sodium Thiocyanate ◽  
Fine Specificity ◽  
Thiocyanate Solution ◽  
Citrullinated Protein ◽  
Citrullinated Peptide ◽  
Substantial Extent

Abstract BackgroundFine specificity of anti-citrullinated protein antibodies (ACPAs), in which cross-reactivity exists, varies among patients with rheumatoid arthritis (RA), but it is unclear whether the mechanism of ACPA production is same or different among individuals. Since avidity of serum antibody reflects the direction of immune response, we compared the levels of avidity and cross-reactivity between various ACPAs in a cohort of RA patient.MethodsSera from 180 RA patients positive for anti-cyclic citrullinated peptide (CCP) 2 antibody were screened for positivity of antibodies against CCP1, and citrullnated fibrinogen (cFib), enolase (cEno), and vimentin (cVim) peptides. Avidity of the four ACPAs, and some autoantibodies and antibodies against foreign antigens was determined by an elution assay using sodium thiocyanate solution. Cross-reactivity between different ACPAs was estimated by measuring the inhibition of binding by competitor peptides. ResultsThe prevalence of anti-CCP1, anti-cFib, anti-cEno, and anti-cVim antibodies in the anti-CCP2-positive RA cohort were 37.7%, 38.3%, 15.6%, and 23.9%, respectively. The avidity of ACPAs, except for anti-cVim antibody, was significantly lower than that of antibodies against foreign antigens, while there was a large variety in the avidity of other autoantibodies. At individual levels, the avidity of anti-cVim was significantly higher than that of other ACPAs, and there was a significant correlation in the avidity of anti-CCP and anti-cFib antibodies. Substantial extent of cross-reactivity was seen between different ACPAs, which also showed a fixed hierarchy.ConclusionThe fixed hierarchy in the avidity and cross-reactivity between different ACPAs suggests that the mechanism underlying ACPA production is common to all RA patients. Presence of a dominant antigen that induces whole ACPA response is speculated.

scholarly journals Selective chelating precipitation of palladium metal from electroplating wastewater using chitosan and its derivative

2020 ◽  
Vol 38 (3-4) ◽  
pp. 113-126
Author(s):  
Qiaoling Xie ◽  
Gaojie Liang ◽  
Tao Lin ◽  
Fuming Chen ◽  
Dandan Wang ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Photoelectron Spectroscopy ◽  
Water Soluble ◽  
Optimum Conditions ◽  
Chitosan Derivative ◽  
Aqua Regia ◽  
Electroplating Wastewater ◽  
X Ray ◽  
Approach Method ◽  
Palladium Metal

A study on selective chelating precipitation of palladium metal from real electroplating wastewater using chitosan and its water-soluble derivative was conducted. The pH parameter, the concentrations of chitosan and its water-soluble derivative and the chelating precipitation time were experimentally investigated, and the optimum conditions were determined. The results revealed that both chitosan and its water-soluble derivative acted as chelating precipitation agents. Rapid chelating precipitation occurred when chitosan was added to real electroplating wastewater containing the chitosan derivative, thereby improving removal efficiency of palladium in different forms up to 95% under the optimum condition of 0.2 g/L chitosan and 0.16 mg/L derivative at pH 2.5. Then, dissolution experiments showed that chelating precipitation products could be dissolved in aqua regia. Additionally, selective chelating precipitation of palladium by chitosan and its derivative was characterized using X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Thus, it can be concluded that the combined utilization of chitosan and its water-soluble derivative is a promising approach method for the removal of different forms of palladium from real electroplating wastewater.

Synthesis of N-[(3'-Hydroxy-2',3'-dicarboxy)- ethyl]chitosan:A New, Water-Soluble Chitosan Derivative

1995 ◽  
Vol 28 (26) ◽  
pp. 8865-8867 ◽  
Author(s):  
James V. Gruber ◽  
Venceslav Rutar ◽  
Jagdeesh Bandekar ◽  
Peter N. Konish
Keyword(s):  
Water Soluble ◽  
Chitosan Derivative

Green and facile synthesis of water-soluble ZnS quantum dots nanohybrids using chitosan derivative ligands

2014 ◽  
Vol 16 (7) ◽  
Author(s):  
Fábio P. Ramanery ◽  
Alexandra A. P. Mansur ◽  
Fernanda G. L. M. Borsagli ◽  
Herman S. Mansur
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Chitosan Derivative ◽  
Facile Synthesis

Use of hypercrosslinked polystyrenes for removing iron complex salts and organic impurities from sodium thiocyanate solution in production of polyacrylonitrile fiber

2015 ◽  
Vol 88 (9) ◽  
pp. 1472-1480 ◽  
Author(s):  
L. A. Pavlova ◽  
S. E. Lyubimov ◽  
M. M. Il’in ◽  
Z. K. Blinnikova ◽  
V. A. Davankov ◽  
...  
Keyword(s):  
Iron Complex ◽  
Sodium Thiocyanate ◽  
Polyacrylonitrile Fiber ◽  
Organic Impurities ◽  
Thiocyanate Solution ◽  
Complex Salts ◽  
Hypercrosslinked Polystyrenes

Novel water-soluble chitosan derivative prepared by graft polymerization of dicyandiamide: synthesis, characterisation, and its antibacterial property

2015 ◽  
Vol 22 (6) ◽  
Author(s):  
Esra Suliman Khalil ◽  
Bahruddin Saad ◽  
El-Sayed Moussa Negim ◽  
Muhammad Idiris Saleh
Keyword(s):  
Graft Polymerization ◽  
Antibacterial Property ◽  
Water Soluble ◽  
Chitosan Derivative

Preparation and characterization of water-soluble chitosan derivative by Michael addition reaction

2010 ◽  
Vol 47 (5) ◽  
pp. 696-699 ◽  
Author(s):  
Mingyan Jiang ◽  
Kemin Wang ◽  
John F. Kennedy ◽  
Jun Nie ◽  
Qiang Yu ◽  
...  
Keyword(s):  
Michael Addition ◽  
Addition Reaction ◽  
Water Soluble ◽  
Michael Addition Reaction ◽  
Chitosan Derivative

scholarly journals Development of a quaternized chitosan with enhanced antibacterial efficacy

2013 ◽  
Vol 11 (3) ◽  
pp. 410-418 ◽  
Author(s):  
Gurpreet Kaur Khaira ◽  
Rashmi Kumariya ◽  
Manmohan Chibber ◽  
Moushumi Ghosh
Keyword(s):  
Water Soluble ◽  
Ammonium Compound ◽  
Escherichia Coli O157 ◽  
Waterborne Pathogens ◽  
Chitosan Derivative ◽  
Quaternized Chitosan ◽  
Short Contact Time ◽  
Ldh Activity ◽  
Low Dosage ◽  
Cell Supernatant

The antibacterial activity of a water-soluble chitosan derivative prepared by chemical modification to quaternary ammonium compound N,N,N-trimethylchitosan (TC) was investigated against four selected waterborne pathogens: Aeromonas hydrophila ATCC 35654, Yersinia enterocolitica ATCC 9610, Listeria monocytogenes ATCC 19111 and Escherichia coli O157:H7 ATCC 32150. An inactivation of 4 log CFU/ml of all waterborne pathogens was noted for the quaternized chitosan as compared with chitosan over a short contact time (30 min) and low dosage (4.5 ppm) at ambient temperature. A marked increase in glucose level, protein content and lactate dehydrogenase (LDH) activity was observed concurrently in the cell supernatant to be a major bactericidal mechanism. The results suggest that the TC derivative may be a promising commercial substitute for acid-soluble chitosan for rapid and effective disinfection of water.

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