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Biomimetic synthesis of superparamagnetic iron oxide particles in proteins

Published online by Cambridge University Press:  31 January 2011

Arvind Sinha
Affiliation:
National Metallurgical Laboratory, Jamshedpur 831007, India
Suprabha Nayar
Affiliation:
National Metallurgical Laboratory, Jamshedpur 831007, India
G. V. S. Murthy
Affiliation:
National Metallurgical Laboratory, Jamshedpur 831007, India
P. A. Joy
Affiliation:
National Chemical Laboratory, Pune 411008, India
V. Rao
Affiliation:
National Metallurgical Laboratory, Jamshedpur 831007, India
P. Ramachandrarao
Affiliation:
Banaras Hindu University, Varanasi 221005, India
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Abstract

Matrix-mediated in situ synthesis of monodispersed magnetite and maghemite nanoparticles (2–16 nm) was carried out using the cavities present in gels of globular proteins such as egg white and bovine serum albumin. Under stringent conditions, spatial-charge-distribution-assisted molecular recognition of proteins for inorganic ions led to the site- and polymorph-specific synthesis of superparamagnetic iron oxide particles. A transformation from magnetite to maghemite as a nucleating phase could be observed by partially denaturing the egg white protein, signifying the delicate role of quaternary structure of proteins under different reaction conditions, in determining the size and shape of the polymorph.

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Copyright
Copyright © Materials Research Society 2003

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