A novel facile synthesis of the amine-functionalized magnetic core coated carboxylated nanochitosan shells as an amphoteric nanobiosupport

Seyed Mehdi Hosseini; Habibollah Younesi; Nader Bahramifar; Zahra Mehraban

doi:10.1016/j.carbpol.2019.06.006

A novel facile synthesis of the amine-functionalized magnetic core coated carboxylated nanochitosan shells as an amphoteric nanobiosupport

Carbohydr Polym. 2019 Oct 1:221:174-185. doi: 10.1016/j.carbpol.2019.06.006. Epub 2019 Jun 5.

Authors

Seyed Mehdi Hosseini¹, Habibollah Younesi², Nader Bahramifar³, Zahra Mehraban⁴

Affiliations

¹ Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, P.O. Box: 46414-356, Noor, Iran.
² Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, P.O. Box: 46414-356, Noor, Iran. Electronic address: hunesi@modares.ac.ir.
³ Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, P.O. Box: 46414-356, Noor, Iran. Electronic address: n.bahramifar@modares.ac.ir.
⁴ Organization for Educational Research and Planning (OERP), Research Institute for Education, P.O. Box: 1584634818, Tehran, Iran.

PMID: 31227156
DOI: 10.1016/j.carbpol.2019.06.006

Abstract

We developed a novel synthesis method for a multifunctional nanocomposite with amine-functionalized Fe₃O₄ core coated with carboxylated nanochitosan shells (NH₂-Fe₃O₄@NCS-COOH) via carbodiimide activation. The chemical structures of chitosan and carboxylated nanochitosan (NCS-COOH) were verified by 1H NMR which confirmed the incorporation of citric acid by the formation of the new signal of the CH2 H-atoms. TEM image displayed the synthesized NH₂-Fe₃O₄@NCS-COOH nanoparticles were in a spherical shape with an average size of 100 nm. The results of XRD revealed that NH₂-Fe₃O₄@NCS-COOH have a good crystalline nature with the face center cubic structure and with the average crystallite size of 17 nm. The characterization using VSM showed that the magnetic nanoparticle had superparamagnetic behavior and the saturation magnetization was up to 30 emu/g. The BET specific surface area of NH₂-Fe₃O₄@NCS-COOH was 45.18 m²/g. The synthesized nanostructure was found to be stable in different ranges of pH due to covalent bonds between nanochitosan and Fe₃O₄.

Keywords: Amide moieties; Amphoteric nanobiosupport; Carboxylated nanochitosan; Citric acid; Core-shell; Magnetic nanochitosan.