Molecular mechanism of lysozyme adsorption onto chemically modified alginate guar gum matrix
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- 作者：Ma. Emilia Brassesco ; Nadia Woitovich Valetti ; Guillermo Picó ; ; gpico@fbioyf.unr.edu.ar
- 关键词：GG ; guar gum ; Alg ; alginate ; LZ ; lysozyme ; Epi ; epichlorohydrin
- 刊名：International Journal of Biological Macromolecules
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：96
- 期：Complete
- 页码：111-117
- 全文大小：782 K
- 卷排序：96
文摘
The equilibrium isotherms and adsorption kinetics of lysozyme (LZ) on epichlorohydrin (Epi) cross-linked alginate-guar gum (Alg-GG) matrix were studied. Adsorption kinetics followed a pseudo-first-order model while the equilibrium isotherm could be represented by the Freundlich equation. The maximal amount of LZ adsorbed onto this matrix was around 2.4 mg per g of hydrated matrix at pH 7.00. The adsorption mechanism was associated to a simple diffusion process with a weak columbic interaction between LZ and the matrix. The presence of NaCl 0.3 M induced a total displacement of the LZ from the matrix. Under this condition, the percentage of desorbed protein was 95%. Successive cycles of adsorption-washing-elution were performed and the results showed the reversibility of the process and the usefulness of the method for enzyme purification and separation. A last successful step was carried out for the purification of LZ from egg white as natural source. The model proved to be useful applied as a platform design in the isolation and purification of proteins.