کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1209151 965330 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Protein adsorption and transport in agarose and dextran-grafted agarose media for ion exchange chromatography
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Protein adsorption and transport in agarose and dextran-grafted agarose media for ion exchange chromatography
چکیده انگلیسی

This work examines the relationship between the physical properties of agarose and dextran-grafted agarose cation exchangers and protein adsorption equilibrium and rates. Four different sulfopropyl (SP) matrices were synthesized using a neutral agarose base material – two based on a short ligand chemistry and two obtained by grafting 10 and 40 kDa dextran polymers. The pore accessibility, determined by inverse size exclusion chromatography (iSEC) with dextran probes, decreases dramatically as a result of the combined effects of crosslinking, dextran grafting, and the introduction of ionic ligands, with pore radii decreasing from 19 nm for the base matrix to 6.1 nm for the 40 kDa dextran-grafted SP-matrix. In spite of this reduction, while the adsorption isotherms were similar, protein uptake rates were greatly increased with the dextran-grafted SP-matrices, compared to SP-matrices based on the short ligand chemistry. The effective pore diffusivities were 4–10 times higher than free solution diffusivity for the dextran-grafted matrices, indicating that the charged dextran grafts result in enhanced protein mass transfer rates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1146, Issue 2, 6 April 2007, Pages 202–215
نویسندگان
, ,