Investigation of polymer dynamics in chitosan-maghemite nanocomposites: a potential green superparamagnetic material

Saravanan, Annamalai; Ramasamy, Radha Perumal

doi:10.1007/s10965-016-0998-1

Cited by 5 publications

(2 citation statements)

References 67 publications

(74 reference statements)

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“…Figure 3 a shows the N 2 adsorption/desorption isotherms for the Fe 3 O 4 /SiO 2 microspheres and p-Fe 3 O 4 /SiO 2 microspheres etched with oxalic acid with different times. All the isotherms are type IV adsorption isotherms, as defined by IUPAC [ 30 ]. The BET surface area of the Fe 3 O 4 /SiO 2 microspheres without oxalic acid etching was 32.9 m 2 /g.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Thermoresponsive Poly(N-isopropylacrylamide-co-acrylic acid)-Grafted Hollow Fe3O4/SiO2 Microspheres with Surface Holes for BSA Release

et al. 2017

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Thermoresponsive P(NIPAM-AA)/Fe3O4/SiO2 microspheres with surface holes serving as carriers were prepared using p-Fe3O4/SiO2 microspheres with a thermoresponsive copolymer. The p-Fe3O4/SiO2 microspheres was obtained using a modified Pickering method and chemical etching. The surface pore size of p-Fe3O4/SiO2 microspheres was in the range of 18.3 nm~37.2 nm and the cavity size was approximately 60 nm, which are suitable for loading and transporting biological macromolecules. P(NIPAM-AA) was synthesized inside and outside of the p-Fe3O4/SiO2 microspheres via atom transfer radical polymerization of NIPAM, MBA and AA. The volume phase transition temperature (VPTT) of the specifically designed P(NIPAM-AA)/Fe3O4/SiO2 microspheres was 42.5 °C. The saturation magnetization of P(NIPAM-AA)/Fe3O4/SiO2 microspheres was 72.7 emu/g. The P(NIPAM-AA)/Fe3O4/SiO2 microspheres were used as carriers to study the loading and release behavior of BSA. This microsphere system shows potential for the loading of proteins as a drug delivery platform.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Thermoresponsive Poly(N-isopropylacrylamide-co-acrylic acid)-Grafted Hollow Fe3O4/SiO2 Microspheres with Surface Holes for BSA Release

et al. 2017

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“…The support containing chitosan can retain more than 80% of immobilized enzyme activity after a number Printed in Brazil www.abeq.org.br/bjche of hydrolytic cycles (Chiou & Wu, 2004;Romdhane, Romdhane, Gargouri, & Belghith, 2011). Furthermore, a maghemite coated chitosan was light, exhibited enhanced tensile strength, high flexibility with tunable magnetic and electrical properties (Saravanan & Ramasamy, 2016).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Lipase Immobilization on Maghemite and Its Physico-Chemical Properties

Ariffin

Idris

Ngadiman

2019

Braz. J. Chem. Eng.

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Nanomaterial-based biocatalysts have emerged as current carriers suitable for enzyme immobilization. The nano-sized materials provide large surface area for enzyme attachment, thus increasing the probability for its efficient catalyst activity. By using magnetized nanomaterials, enhancement of the downstream processing is evident as it eases the immobilized enzyme separation from the reaction mixture further. Lipase / maghemite composites were prepared by initial maghemite surface modification to cater to the needs for biocatalyst attachment. Surface modification using chitosan and subsequent cross-linking with glutaraldehyde provide a suitable environment for the enzyme to be immobilized. Optimization of the conditions for lipase immobilization was carried out using a response surface methodology (RSM) experimental design to obtain the precise optimized conditions for the process. Selected process variables involved were chosen and optimized conditions for lipase immobilization were 9 hour incubation time, 55°C incubation temperature and 12 % (v/v) glutaraldehyde content. The optimized immobilized lipase activity was 1.8 U. Characterizations of the on synthesized materials were also performed. The size distribution of maghemite nanomaterials was mainly within the range of 2-3 nm. Thermal properties of the synthesized maghemite was investigated using DSC and TGA analyses and we found that maghemite changes to hematite at 456.3°C. Magnetic properties of both untreated and lipase immobilized maghemite were studied using VSM and both were superparamagnetic nanomaterials with saturation magnetizations of 34.3 and 80.3, respectively.

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Characterization and molecular dynamic studies of chitosan–iron complexes

Fahmy

Sarhan

2021

Bull Mater Sci

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Investigation of polymer dynamics in chitosan-maghemite nanocomposites: a potential green superparamagnetic material

Cited by 5 publications

References 67 publications

Preparation and Characterization of Thermoresponsive Poly(N-isopropylacrylamide-co-acrylic acid)-Grafted Hollow Fe3O4/SiO2 Microspheres with Surface Holes for BSA Release

Preparation and Characterization of Thermoresponsive Poly(N-isopropylacrylamide-co-acrylic acid)-Grafted Hollow Fe3O4/SiO2 Microspheres with Surface Holes for BSA Release

Optimization of Lipase Immobilization on Maghemite and Its Physico-Chemical Properties

Characterization and molecular dynamic studies of chitosan–iron complexes

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