4.6 Article

Studies on varying n-alkanethiol chain lengths on a gold coated surface and their effect on antibody-antigen binding efficiency

Journal

RSC ADVANCES
Volume 5, Issue 98, Pages 80480-80487

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra11725a

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Funding

  1. DeitY, Government of India

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Self-assembled monolayer (SAM) of n-alkanethiols of different chain lengths (n = 2, 3, 6, 11, 16) on a gold surface are used to immobilize antibodies which in turn bind to a antigen. The antibody and antigen used in this study have similar molecular weights i.e. similar to 150 kDa. The antibody [1.5 mu g cm(-2)] immobilized varied with the surface packing density of the SAM of carboxylic acid-terminated n-alkanethiols of different lengths. In comparison, the efficiency of antibody immobilization was lowest on the loosely packed SAM of n-alkanethiols (n <= 3) and the highest on the densely packed SAM of n-alkanethiols (n >= 11). However, increased immobilization of antibodies with increasing chain length of the n-alkanethiols [n > 11], did not result in a corresponding increase in antigen binding. An attempt to explain this phenomenon based on packing density and an orientation of the captured antibody is presented.

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