News Column

Studies in the Area of Nanoparticles Reported from Washington University

May 27, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Nanoparticles. According to news reporting originating from St. Louis, Missouri, by NewsRx correspondents, research stated, "It is highly desirable to study the kinetics and spectroscopy of enzymes in a crowded and controllable microenvironment. In this work, we employ mesoporous silica of matching pore sizes to confine lysozyme in order to mimic enzyme in a crowded environment."

Our news editors obtained a quote from the research from Washington University, "The stability and activity of lysozyine immobilized in mesoporous silica nanoparticle (MSN) of various pore sizes were studied and correlated to spectroscopic data of the immobilized enzyme. By site-selective surface functionalization, we were able to avoid protein adsorbing on the external surfaces of MSNs and study specifically the protein immobilized in the nanochannels. Solution spectroscopic methods, CD and fluorescence, were used to study the secondary and tertiary structures of the immobilized enzyme because MSNs could be suspended very well in solution. To study the catalytic activity of lysozyme, we employed 4-methylumbelliferyl beta-D-N,N',N ''-triacetylchitotrioside as a substrate that was hydrolyzed and detected by fluorescence spectroscopy. 8-Anilino-1-naphthalenesulfonic acid was utilized as a fluorescence probe to characterize the protein-binding site. The conformation, thermal stability, and catalytic activity of lysozyme were sensitive to the curvature of the silica materials. The activity of the lysozyme immobilized in the 5.6 nm mesopores of MSNs was higher than those of native enzymes."

According to the news editors, the research concluded: "The enhanced activity was attributed to subtle change in tertiary structure of lysozyme in the crowded microenvironment in the mesopores."

For more information on this research see: Enhanced Activity and Stability of Lysozyme by Immobilization in the Matching Nanochannels of Mesoporous Silica Nanoparticles. Journal of Physical Chemistry C, 2014;118(13):6734-6743. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Journal of Physical Chemistry C -

The news editors report that additional information may be obtained by contacting K.C. Kao, Washington University, Dept. of Chem, St Louis, MO 63130, United States. Additional authors for this research include T.S. Lin and C.Y. Mou (see also Nanoparticles).

Keywords for this news article include: Missouri, Lysozyme, St. Louis, United States, Nanotechnology, Silicon Nanocrystals, Emerging Technologies, Enzymes and Coenzymes, North and Central America

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Source: Life Science Weekly

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