Iron(II) cross-linked chitin-based gel beads: Preparation, magnetic property and adsorption of methyl orange

Improving surface and mechanical properties of alginate films by using ethanol as a co-solvent during external gelation

“…SA has been extensively used in drug delivery (da Laurienzo et al, 2006;Suksamran et al, 2009), wound dressings (Goh, Heng, & Chan, 2012b;Pereira, Carvalho, Vaz, et al, 2013a), and tissue engineering (Pankongadisak, Ruktanonchai, Supaphol, & Suwantong, 2014), due to its biocompatibility, low toxicity, relatively low cost, and functional gelation by addition of polyvalent cations, such as Ca 2+ , Ba 2+ , Zn 2+ , and Cu 2+ Goh, Heng, & Chan, 2012b;Klinkajon & Supaphol, 2014;Li, Du, Tao, Deng, Luo, & Yang, 2010;Pereira, Carvalho, Vaz, et al, 2013a). Calcium-induced gelation has been demonstrated to result from specific and strong interactions between calcium ions and guluronate blocks in alginate, resulting in a so-called "egg-box" junction zone (Goh, Heng, & Chan, 2012a;Lee & Mooney, 2012;Li, Fang, Vreeker, & Appelqvist, 2007;Sikorski, Mo, Skjak-Braek, & Stokke, 2007).…”

Bionanocomposites for Magnetic Removal of Water Pollutants

“…Transmission Electron Microscopy (TEM) images of these nanocomposites revealed spherical aggregates containing Fe 3 O 4 nanoparticles with sizes ranging 8-15 nm [79]. Magnetic iron-oxide nanoparticles have also been synthesized by in situ co-precipitation in the presence of other biopolymers such as carrageenan [57], chitosan [100,14] and chitin/alginate [50]. Carrageenans, which are sulfated polysaccharides, were employed as stabilizers in the synthesis of magnetite nanoparticles via co-precipitation of ferric and ferrous ions and subsequent biopolymer cross-linking with K + ions [57], see Fig.…”

“…Similarly, magnetic chitin/alginate beads were prepared in situ by promoting ionic cross-linking between the oppositely charged biopolymer chains, leading to iron oxide nanoparticles (30 nm average) uniformly dispersed and immobilized in the polymer matrix [50]. Fig.…”

Structure and properties of chitin/alginate blend membranes from NaOH/urea aqueous solution

“…Faced with these unfavorable characteristics, we hope to realize a dream of producing regenerated chitin materials by using low-cost chemical reagents and a simple process that yields essentially nontoxic byproducts. In our laboratory, 8 wt% NaOH/4 wt% urea aqueous solution precooled to −20 • C has been developed to dissolve chitin, leading to the formation of a transparent chitin solution [12,13]. NaOH/urea aqueous solution is one of the cheapest solvents, and has a low environmental impact compared to other solvent systems [14].…”