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- W2060140910 abstract "PEGylation is a strategy that has been used to improve the biochemical properties of proteins and their physical and thermal stabilities. In this study, hen egg-white lysozyme (EC 3.2.1.17; LZ) was modified with methoxypolyethylene glycol-p-nitrophenyl carbonate (mPEG-pNP, MW 5000). This PEGylation of LZ produced conjugates that retained full enzyme activity with glycol chitosan, independent of degree of enzyme modification; its biological activity with the substrate Micrococcus lysodeikticus was altered according to its degree of modification. The conjugate obtained with a low degree of mPEG-pNP/NH2 modification was studied by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF), demonstrating a spectral peak at m/z 19,988 Da with 77% of its original enzymatic activity. Spectroscopic studies of Fourier transform infrared (FTIR) and circular dichroism (CD) did not show any relevant differences in protein structure between the native and conjugate LZ. Studies of the effects of pH and temperature on PEGylated LZ indicated that the conjugate was active over a broad pH range, stable at 50 °C, and demonstrated resistance to proteolytic degradation." @default.
- W2060140910 created "2016-06-24" @default.
- W2060140910 creator A5031296482 @default.
- W2060140910 creator A5067314417 @default.
- W2060140910 date "2010-06-01" @default.
- W2060140910 modified "2023-10-16" @default.
- W2060140910 title "Biochemical and biophysical characterization of lysozyme modified by PEGylation" @default.
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- W2060140910 doi "https://doi.org/10.1016/j.ijpharm.2010.03.036" @default.
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