Magnetic composites from minerals: Study of the iron phases in clay and diatomite using Mössbauer spectroscopy, magnetic measurements and XRD

M. Cabrera, J. C. Maciel, J. Quispe-Marcatoma, B. Pandey, D. F.M. Neri, F. Soria, E. Baggio-Saitovitch, L. B. de Carvalho

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Magnetic particles as matrix for enzyme immobilization have been used and due to the enzymatic derivative can be easily removed from the reaction mixture by a magnetic field. This work presents a study about the synthesis and characterization of iron phases into magnetic montmorillonite clay (mMMT) and magnetic diatomaceous earth (mDE) by 57Fe Mössbauer spectroscopy (MS), magnetic measurements and X-ray diffraction (XRD). Also these magnetic materials were assessed as matrices for the immobilization of invertase via covalent binding. Mössbauer spectra of the magnetic composites performed at 4.2 K showed a mixture of magnetite and maghemite about equal proportion in the mMMT, and a pure magnetite phase in the sample mDE. These results were verified using XRD. The residual specific activity of the immobilized invertase on mMMT and mDE were 83 % and 92.5 %, respectively. Thus, both magnetic composites showed to be promising matrices for covalent immobilization of invertase.

Original languageEnglish
Pages (from-to)197-204
Number of pages8
JournalHyperfine Interactions
Volume224
Issue number1-3
DOIs
StatePublished - Jan 2014

Bibliographical note

Funding Information:
Acknowledgements This work was financially supported by the Brazilian Agencies CAPES and CNPq. The authors are grateful to Dr. José Albino Oliveira de Aguiar for XRD analyses and Dr. Adilson Jesus Aparecido de Oliveira for magnetization measurements.

Keywords

  • Diatomite
  • Immobilization
  • Invertase
  • Magnetic particles
  • Montmorillonite

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