Novel metal-chelate affinity adsorbent for purification of immunoglobulin-G from human plasma

被引:48
作者
Denizli, A
Alkan, M
Garipcan, B
Özkara, S
Piskin, E
机构
[1] Hacettepe Univ, Dept Chem, Div Biochem, TR-06532 Ankara, Turkey
[2] Hacettepe Univ, Bioengn Div, TR-06532 Ankara, Turkey
来源
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES | 2003年 / 795卷 / 01期
关键词
metal-chelate affinity beads; purification; immunoglobulin G;
D O I
10.1016/S1570-0232(03)00550-6
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Metal-chelating ligand and/or comonomer 2-methacrylolyamidohistidine (MAH) was synthesized by using methacryloyl chloride and L-histidine methyl ester. MAH was characterized by NMR and FTIR. Spherical beads with an average diameter of 75-125 mum were produced by suspension polymerization of methylmethacrylate (MMA) and MAH carried out in an aqueous dispersion medium. Poly(MMA-MAH) beads had a specific surface area of 37.5 m(2)/g. Poly(MMA-MAH) beads were characterized by water uptake studies, FTIR, SEM and elemental analysis. Elemental analysis of MAH for nitrogen was estimated as 34.7 mumol/g of polymer. Then, Cu2+ ions were chelated on the beads. Cu2+ -chelated beads with a swelling ratio of 38% were used in the adsorption of human-immunoglobulin G (HIgG) from both aqueous solutions and human plasma. The maximum adsorption capacities of the Cu2+ -chelated beads were found to be 12.2 mg/g at pH 6.5 in phosphate buffer and 15.7 mg/g at pH 7.0 in MOPS. Higher adsorption value was obtained from human plasma (up to 54.3 mg/g) with a purity of 90.7%. The metal-chelate affinity beads allowed one-step separation of HIgG from human plasma. The adsorption-desorption cycle was repeated 10 times using the same beads without noticeable loss in their HIgG adsorption 41 capacity. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:93 / 103
页数:11
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