Modification of chitosan onto PE by irradiation in salt solutions and possible use as Cu²⁺ complex film for pest snail control

Abstract

Chitosan‐grafted‐polyethylene (CS‐g‐PE) film was prepared using simultaneous radiation‐inducing grafting technique. The copper ion (Cu2+) adsorptivity on the CS‐g‐PE film was determined. The CS‐hydroxybenzyltriazole (CS‐HOBt), CS‐N‐hydroxysuccinimide (CS‐NHS), CS‐acetic acid (CS‐HOAc), and CS‐glutathione (CS‐GSH) were used as CS‐salts in aqueous solutions. Among these grafting solution systems, the CS‐g‐PE film prepared from CS‐HOBt solution showed the greatest grafting amount and highest Cu2+ adsorptivity, up to 30.2% (1.51 ppm, 7.56 µg cm−2). The effects of the CS‐HOBt concentration and mixing solution on the grafting amount were also observed to clarify their efficacies to assist radiation‐induced grafting reaction. SEM/EDS mapping, ICP and XRF were used to clarify the Cu2+ adsorption capacity of the CS‐g‐PE film and the stability of Cu2+ on the CS‐g‐PE complex film. The Cu2+ showed its stability on the CS‐g‐PE film at room temperature in neutral and basic solutions. The Cu2+‐‐‐CS‐g‐PE complex film reduced pest snail breeding as high as 54%. The success of this observation is a new approach to modify PE surface with a functional biopolymer, CS containing Cu2+ complex for controlling pest snail breeding. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41204.

Chitosan Film Containing an Iron Complex: Synthesis and Prospects for Heterocyclic Aromatic Amines (HAAs) Recognition

“…Moreover, the increase in the water angle indicates the decrease in the hydrophilic character and wettability of the surface of the CS-modified film. The presence of −OH and −NH 2 groups in CS is responsible for the hydrophilic character and wettability of the CS polymer, so the decrease of this parameter corroborates the previous assignment of physical and intermolecular interactions, mainly hydrogen bonds, between [Fe­(CN) 5 (NH 3 )] 3– and CS via −NH 2 and −OH fragments …”

pH-Responsive Water-Soluble Chitosan Amphiphilic Core–Shell Nanoparticles: Radiation-Assisted Green Synthesis and Drug-Controlled Release Studies

“…The XRD pattern of DC-WCS showed a significant broad diffraction peak at 19.7° (2θ) because of changes in the morphology of WCS resulting from insertion of the DC moieties ( Figure 1 (Cb)). The DC conjugate brought about a more amorphous structure of CS because the hydrophobic bulky structure of DC obstructed the inter- and intra-molecular hydrogel bonding of CS [ 25 , 27 ]. New hydrogen bonds could also occur between the –OH group of DC and the functional groups of WCS (i.e., –NH 2 , –OH, C–O–C, and C=O).…”

“…For example, the characteristic crystalline peak of PEGMA was found at 14.5° and 30.4° (2θ) when PEGMA was grafted onto CS [ 27 ]. As in the previous work, DC-CS-PG was used for comparative study, and diffraction peaks were observed at 12.8°, 18.7°, 21.6°, and 23.9° (2θ) [ 25 , 38 ]. For CS modified with PEG, two strong crystalline peaks at 19.3–23.6° (2θ) and two broad crystalline peaks around 26−31° (2θ) were assigned to the PEG crystalline [ 55 , 57 ].…”

“…With the amino (–NH 2 ) and hydroxyl (–OH) groups, their functions enable CS to conjugate with several molecules, such as ethylene glycol (PEG) [ 19 , 20 , 21 ], gallic acid [ 22 ], deoxycholic acid [ 23 ], and bombesin peptide [ 24 ]. According to the functional groups, CS also has metal chelation and reduction reaction capacities [ 25 , 26 ], antioxidant/antimicrobial activities [ 27 ], and pH-responsive ability [ 28 ]. With its unique characteristic, CS has been applied as a main natural polymer for the development of several biomaterials, such as pH-responsive hydrogels for delivering 5-fluoro uracil [ 29 , 30 ] and nanocarriers for delivering genes, proteins, DNA, siRNA, and anticancer drugs [ 31 ].…”