title: Hydrophobic starch nanocrystals preparations through crosslinking modification using citric acid.
abstract: Biodegradable starch nanocrystals prepared by an acid treatment process were modified through crosslinking modification using citric acid as reactant by a dry reaction method. The occurrence of crosslinking modification was evaluated by Fourier transform infrared spectroscopy and swelling degree. X-ray diffraction, wettability tests and contact angle measurements were used to characterize the modified starch nanocrystals. It was found that the crosslinked starch nanocrystals displayed a higher affinity for low polar solvents such as dichloromethane. The surface of starch nanocrystals became more roughness after crosslinking modification with citric acid and the size decreased as revealed by scanning electron microscopy and dynamic light scattering results. XRD analysis showed that the crystalline structure of starch nanocrystals was basically not changed after the crosslinking modification with shorter heating time. The resulting hydrophobic starch nanocrystals are versatile precursors to the development of nanocomposites.
authors.affiliation: Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Tong
authors.affiliation: College of Chemistry, Jilin University, Changchun 130022, China.
authors.forename: Xingguang
authors.initials: X
authors.lastname: Su
authors.affiliation: Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China; College of Chemistry, Jilin University, Changchun 130022, China. Electronic address: liliren@jlu.edu.cn.
authors.forename: Lili
authors.initials: L
authors.lastname: Ren
mesh_terms: D019343:Citric Acid / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013213:Starch / Q000737:chemistry*; D017155:Wettability
chemical_list: D019343:Citric Acid; D013213:Starch
keywords: Crosslinking; Hydrophobicity; Starch nanocrystals