Water-soluble modified chitosan and its interaction with a polystyrenesulfonate anion

A simple and convenient method to synthesize N-[(2-hydroxyl)-propyl-3-trimethylammonium] chitosan chloride in an ionic liquid

“…The adsorption peak at 1595 cm −1 corresponds to the N H deformation vibration of amino groups (Lim & Hudson, 2004), absent in the HTCC spectra, indicating that the primary amide has been changed to a secondary amine by the nucleophilic substitution of NH 2 and epoxy groups. The peak at 1660 cm −1 reflects bending vibration of N H bond, manifesting the presence of secondary amines (Gorshkova et al, 2011;Wang et al, 2013). The peak at 1475 cm −1 for HTCC spectra can be assigned to the C H bending of −N(CH 3 ) + 3 , suggesting the introduction of −N(CH 3 ) + 3 in the CS backbone (Lim & Hudson, 2004).…”

“…O-methyl-1-N-trimethylated chiotsan chloride, N,O-(2-hydroxy-3-trimethylammonio) propylated chitosan chloride and N-p-(N-methylpyridinio)methylated chitosan chloride displayed very low specific resistance, based on which three kinds of chitosan quaternary ammonium salts could be used as antistatic materials (Suzuki, Oda, Shinobu, Saimoto, & Shigemasa, 2000). During the preparation of chitosan (Jia, Shen, & Xu, 2001;Jintapattanakit, Mao, Kissel, & Junyaprasert, 2008;Rúnarsson et al, 2007;Sajomsang et al, 2010;Vallapa et al, 2011;Xu et al, 2011), 3-chloro-2-hydroxypropyl trimethylammonium chloride (Fan et al, 2012;Zhang, Geng, Jiang, Li, & Huang, 2012;Sajomsang, Gonil, & Tantayanon, 2009) and EPTAC (Gorshkova et al, 2011;Qin et al, 2004;Lim & Hudson, 2004;Luo, Wang, Xia, & Wu, 2010;Sun, Du, Fan, Chen, & Yang, 2006) were commonly used. The synthesis of chitosan quaternary ammonium salts is often carried out in heterogeneous reaction media and involves large amounts of volatile organic solvents (isopropanol, DMSO) and other harsh chemicals (NaCl, LiCl, HCl and NaOH), which pollute the environment and cause health problems.…”

Novel Biocatalysts Based on Bromelain Immobilized on Functionalized Chitosans and Research on Their Structural Features

“…N -(2-hydroxy) propyl-3-trimethylammonium chitosan was obtained with the following process: 3.0 g of chitosan was suspended in 30 mL of distilled water for 30 min at 85 ± 2 °C. Then, the calculated amount of glycidyltrimethyl ammonium chloride (GTMAC) (GTMAC:chitosan repeating link = 3:1 mol) was dropwise added to the reaction mixture for 1 h and kept at 85 ± 2 °C for 10 h. The final product was isolated from the reaction mixtures via precipitation in acetone, washed three times with methanol, and dried in a vacuum oven at 55 ± 2 °C to a constant weight [ 40 ]. The product yield was 62–74%; the degrees of substitution calculated from FTIR data were 0.24, 0.19, and 0.57 for chitosans with molecular weights of 600, 350, and 200 kDa, respectively.…”

Properties of modified chitosan adsorb acid chrome blue K in wastewater

“…The wastewater fro m printing and dyeing process has complex ingredients, high chromaticity, and high COD. And it tends to be anti-oxidant and resistance biodegradable [1][2][3][4][5][6][7][8][9]. In this experiment, pr inting and dyeing wastewater was simulated by acid chrome blue K solution.…”

“…The low pH value of wastewater was benefit to the co mbination of the dEsociated -NH2 in chitosan molecular chain and dyestuff molecule, promoted chitosan to adsorb dye. However, the dissociated -NH2 had a lone pair electrons; in strong acid, it was easier to combine with H+ in the solution and form polyelectrolyte[8]. So me chitosan were dissolved that greatly weakened the amount of dyestuff molecules which transferred from liquid phase to solid phase[9].…”