Regeneration of ethyl parathion antibodies for repeated use in immunosensor: a study on dissociation of antigens from antibodies

被引:55
作者
Kandimalla, VB
Neeta, NS
Karanth, NG
Thakur, MS [1 ]
Roshini, KR
Rani, BEA
Pasha, A
Karanth, NGK
机构
[1] Cent Food Technol Res Inst, Fermentat Technol & Bioengn Dept, Mysore 570013, Karnataka, India
[2] Cent Food Technol Res Inst, Food Protectants & Infestn Control Dept, Mysore 570013, Karnataka, India
关键词
dissociation; immunosensor; ethyl parathion antibodies; immobilization;
D O I
10.1016/j.bios.2004.03.027
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Reliable analysis using an immunosensor strongly depends on the specificity, activity, and sensitivity of the antibody. Immobilization of antibody on the solid matrix enables its repeated use, for which it is required to dissociate the antigens and antigen-enzyme conjugate from the immobilized antibody matrix after each use and while doing so, a maximum retention of activity and specificity are crucial requirements. In the present investigation, on the development of an immunosensor for the organophosphorus pesticide ethyl parathion (EP) using EP antibodies, different dissociating agents such as organic solvents, detergents and acidic buffers, that is, dimethyl sulphoxide (DMSO), Tween-20, cetyl trimethyl ammonium bromide (CTAB), methanol, chloroform, guanidium chloride (GdmCl), glycine-HCl (Gly-HCl) buffer in the pH range of 1.5-3.0, pierce buffer and combination of DMSO and methanol in phosphate buffer and Gly-HCl buffer and salts like NaCl and MgCl2 were used. Generally about 50-60% dissociation was obtained with some degree of denaturation of the antibody immobilized on the sepharose matrix. However, 1% DMSO in combination with 0.2 M Gly-HCl buffer at a pH of 2.3 showed 97% dissociation and the immobilized antibody retained sufficient activity to carry out 14 reproducible assays for ER (C) 2004 Published by Elsevier B.V.
引用
收藏
页码:903 / 906
页数:4
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