Abstract
A significant recent development in sol-gel science has been the encapsulation of biomolecules such as proteins and enzymes in optically transparent silica glasses. This paper reports on the encapsulation of an iron (Fe) storage protein, ferritin, to develop a magnetic silica glass. Native ferritin, which has a nanometer-sized microcrystalline Fe oxide core, was encapsulated in optically transparent silica glasses using the sol-gel process. Fe could be released from ferritin but could not be reconstituted into apoferritin when the protein was trapped in the pores of the glass. Transmission electron microscopy of ferritin-doped aged silica gels indicated that crystallinity of the Fe oxide core was retained upon sol-gel encapsulation. Magnetic measurements on ferritin-doped silica gels indicated the material to be paramagnetic, but not superparamagnetic.
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References
S.Braun, S.Rappoport, R.Zusman, D.Avnir, and M.Ottolenghi, Mater. Lett. 10, 1 (1990).
L.M.Ellerby, C.R.Nishida, F.Nishida, S.A.Yamanaka, B.Dunn, J.S.Valentine, and J.I.Zink, Science 255, 1113 (1992).
B.C. Dave, B. Dunn, J.S. Valentine, and J.I. Zink, Anal. Chem. 66, 1120A (1994).
D.Avnir, S.Braun, O.Lev, and M.Ottolenghi, Chem. Mater. 6, 1605 (1994).
E.C. Theil, North Carolina State University, personal communication.
S.Mann, J.Webb, and R.J.P.Williams, (Ed.), Biomineralization (VCH Publishers, New York, 1989).
I.Bertini, H.B.Gray, S.J.Lippard, and J.S.Valentine, Bioinorganic Chemistry (University Science Books, Mills Valley, California, 1994).
M.-E.Y.Mohie-Eldin and L.Gunther, in Studies of Magnetic Properties of Fine Particles and Their Relevance to Materials Science, edited by J.L.Dormann and D.Fiorani (Elsevier Science Publishers, Amsterdam, 1992).
R.B.Frankel, G.C.Papaefthymiou, and G.D.Watt, Hyperfine Interactions 66, 71 (1991).
S.Morup, in Studies of Magnetic Properties of Fine Particles and Their Relevance to Materials Science, edited by J.L.Dormann and D.Fiorani (Elsevier Science Publishers, Amsterdam, 1992).
D.P.E.Dickson and R.B.Frankel, in Studies of Magnetic Properties of Fine Particles and Their Relevance to Materials Science, edited by J.L.Dormann and D.Fiorani (Elsevier Science Publishers, Amsterdam, 1992).
E.R.Bauminger and I.Nowik, Hyperfine Interactions 50, 484 (1989).
C.Yang, A.Meagher, B.H.Huynh, D.E.Sayers, and E.C.Theil, Biochemistry 26, 497 (1987).
N.D.Chasteen and E.C.Theil, J. Biol. Chem. 257, 7672 (1982).
E.R.Bauminger, P.M.Harrison, I.Nowik, and A.Treffry, Biochemistry 28, 5486 (1989).
J.S.Rohrer, R.B.Frankel, G.C.Papaefthymiou, and E.C.Theil, Inorg. Chem. 28, 3393 (1989).
R.K.Wangsness, Electromagnetic Fields (John Wiley and Sons, New York, 1986).
N.W.Ashcroft and N.David Mermin, Solid State Physics (W.B. Saunders Company, Philadelphia, 1976).
W.D.Kingery, H.K.Bowen, and D.R.Uhlmann, Introduction to Ceramics (John Wiley & Sons, New York, 1976).
C.Kittel, Introduction to Solid State Physics (John Wiley and Sons, New York, 1986).
S.Gider, D.D.Awschalom, T.Douglas, S.Mann, and M.Chaparala, Science 268, 77 (1995).
M.E.Y.Mohie-Eldin, R.B.Frankel, and L.Gunther, J. Mag. Mag. Mater. 135, 65 (1994).
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Lan, E.H., Dunn, B., Valentine, J.S. et al. Encapsulation of the ferritin protein in sol-gel derived silica glasses. J Sol-Gel Sci Technol 7, 109–116 (1996). https://doi.org/10.1007/BF00401890
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DOI: https://doi.org/10.1007/BF00401890