title: Enhancement of the controlled-release properties of chitosan membranes by crosslinking with suberoyl chloride.
abstract: A novel crosslinking agent, suberoyl chloride, was used to crosslink N-phthaloyl acylated chitosan and improves the properties of chitosan membranes. Membranes with different crosslinking degrees were synthesized. The derivatives were characterized by Fourier transform infrared spectroscopy and ¹³C solid state nuclear magnetic resonance spectroscopy, which indicated that the crosslinking degrees ranged from 0 to 7.4%. The permeabilities of various plant nutrients, including macroelements (N, P, K), microelements (Zn²⁺ and Cu²⁺), and a plant growth regulator (naphthylacetic acid), were varied by moderate changes in crosslinking degree, indicating that the controlled-release properties can be regulated in this way. The film-forming ability of native chitosan was maintained, whilst mechanical properties, hydrophobicity and controlled permeability were improved. These dramatic improvements occurred with a small amount of added suberoyl chloride; excessive crosslinking led to membranes with unwanted poor permeability. Thus, both the mechanical properties and permeability of the crosslinked membrane can be optimized.
authors.affiliation: Department of Environmental Sciences & Engineering, College of Resources & Environmental Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Chen
authors.forename: Zideng
authors.initials: Z
authors.lastname: Gao
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Qiu
authors.forename: Shuwen
authors.initials: S
authors.lastname: Hu
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D015394:Molecular Structure; D009280:Naphthaleneacetic Acids / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D010539:Permeability; D010937:Plant Growth Regulators / Q000737:chemistry; D013718:Tensile Strength
chemical_list: D002712:Chlorides; D003692:Delayed-Action Preparations; D008567:Membranes, Artificial; D009280:Naphthaleneacetic Acids; D010937:Plant Growth Regulators; C034182:1-naphthaleneacetic acid; D048271:Chitosan