Synthesis of a novel water-soluble chitosan derivative for flocculated decolorization

Synthesis, properties and performance of organic polymers employed in flocculation applications

“…In this review, we have described the synthesis techniques and flocculation efficiency associated with several non-ionic (1-26, cationic , anionic (60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72) and amphoteric (73)(74)(75)(76)(77)(78)(79)(80)(81)(82) polymers, and a summary of each type of polymeric flocculant is presented in Table 1 to Table 4, respectively. The development of synthetically-modified polysaccharide-based materials was observed to be of significant research interest recently due to their aforementioned biodegradable characteristics compared to synthetic flocculants.…”

“…[70][71][72][73] However, in polymer 46, the chitosan backbone was also modified by ring-opening reaction with glycidyl methacrylate prior to the graft polymerization process. 74 Apart from DMC, monomers such as N-vinyl formamide (NVF), and dimethyl acryloyloxyethyl benzyl ammonium chloride were grafted onto chitosan to develop cationic polymers 47 and 48, respectively. 75,76 Cationic moieties such as N-3-chloro-2-hydroxypropyl trimethylammonium chloride, N-alkyl-N,N-dimethyl-N-2-hydroxypropyl ammonium chloride, 3-acrylamidopropyl trimethylammonium chloride, 3-methacryloylaminopropyl trimethylammonium chloride, NVF and DMC were used in modification of many different polysaccharides, including guar gum (49), 77 carboxymethyl guar gum (50), 17 salep (51), 78 corn cob (52), 79,80 glycogen (53), 81 amylopectin (54), 82 dextran (55), 83 pullulan (56), 84 inulin (57), 85 xylan (58), 86 and tamarind kernel polysaccharide (59).…”

Apple juices processed by high hydrostatic pressure: Interaction between chitosan application and quality drift

“…Besides, all juice samples incorporating chitosan displayed a Hue (Table 3) ranging between c.a. 124-133 (green/yellow), suggesting the endorsement of electrostatic interactions, as in acid solution charge neutralization can be achieved just with high chitosan contents (Jiang et al, 2011). According with previous reports Martín-Diana et al, 2009), our data further suggest that among the juice samples treated with chitosan (T1-4), the inhibition of the enzymatic browning triggered by polyphenoloxidases (Weemaes et al, 1998;Rocha et al, 1999) implicates two hydroxyl groups and a partially acetylated amino group (Wenjun et al, 2002), through blocking of the binding of the enzyme to prevent the use of oxygen.…”

Graft Copolymerization onto Chitosan V: Grafting Ethyl Acrylate onto Chitosan Initiated By Ceric Ion and Its Anti Microbial Activity

“…The excellent features such as biocompatibility, ecologically safe biodegradability (degradation products of chitosan are nontoxic, nonimmunogenic and non-carcinogenic) and low toxicity with versatile biological activities (chitosan has antimicrobial activity and low immunogenicity) recommends this biopolymer for applications in biomedicine [15][16][17][18][19][20]. In addition, chitosan is very efficient for interaction with the anionic solutes including dyes in acidic solutions due to the reactive groups, such as -OH and -NH2.…”