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Molecular imprinted particles for lysozyme purification

✍ Scribed by Mehmet Odabaşi; Ridvan Say; Adil Denizli


Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
358 KB
Volume
27
Category
Article
ISSN
0928-4931

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✦ Synopsis


Molecular recognition-based separation techniques have received much attention in chemistry and biology because of their high selectivity for target molecules. The aim of this study is to prepare lysozyme-imprinted polymers which can be used for the purification of lysozyme from aqueous solutions and egg white. N-methacryloyl-(L)-histidinemethylester (MAH) was chosen as the metal-complexing monomer. In the first step, Cu 2+ was complexed with MAH and the lysozyme-imprinted poly(HEMA-MAH) [Lys-MIP] particles were synthesized by UV-initiated bulk polymerization. After that, the template (i.e., lysozyme) were removed using 0.1 M NaCl solution. The specific surface area of the Lys-MIP particles was found to be 22.9 m 2 /g with a size range of 20-63 μm in diameter and the swelling ratio was 57%. According to the elemental analysis results, the particles contained 421 μmol MAH/g polymer. The maximum lysozyme adsorption capacity was 12.1 mg/g polymer. The relative selectivity coefficients of imprinted particles for lysozyme/human serum albumin and lysozyme/cytochrome c were 3.6 and 4.1 times greater than NIP particles, respectively. Purification of lysozyme from egg-white was also monitored by determining the lysozyme activity using Micrococcus lysodeikticus as substrate. The purity of the desorbed lysozyme was about 89% with recovery about 84%. The Lys-MIP particles could be used many times without decreasing their adsorption capacities significantly.


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