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Acta Phys. -Chim. Sin.  2018, Vol. 34 Issue (2): 177-184    DOI: 10.3866/PKU.WHXB201707121
ARTICLE     
Control of the Ligand Surface Density through Reaction Kinetics of Amino and Surface Vinyl Sulfone Groups
Fang CHENG1,2,*(),Mingyang LI1,2,Wei HE1,3,Hanqi WANG1,2
1 State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China
2 School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China
3 School of Chemical Engineering, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China
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Abstract  

Control over the ligand surface density provides an accurate molecular basis for the quantitative study of biomolecular interactions. However, the classic hybrid self-assembly method lacks general applicability toward different self-assembly systems. In this paper, we report a new method based on the reaction kinetics of vinyl sulfone groups presented on surface to control the surface ligand density. , -bis(carboxymethyl)-L-lysine (ab-NTA) was selected as the model biological ligand and the catalyst for surface reaction was screened. The surface reaction was characterized by X-ray photoelectron spectroscopy (XPS) and the surface membrane potential. Static water contact angle was used to quantify the kinetics of the surface reaction, and calculations showed that the rate constant was 0.0012 min-1. The ability of the biological functional surface to bind a histidine labeling protein (SA-6His) was investigated by surface plasmon resonance (SPR). The results show that such a surface has a higher protein binding quantity and binding strength than the traditional NHS-NTA surface. Four biological functional surfaces with different ligand densities were prepared by controlling the reaction time and catalyst, and the protein static adsorption of these surfaces was analyzed by SPR. The results show that ligand density and multivalence of the biological functional surface can be controlled by modulating the reaction time and catalyst.



Key wordsSurface catalysis      Vinyl sulfone      ab-NTA      Density control      SPR      Multivalent     
Received: 05 June 2017      Published: 12 July 2017
MSC2000:  O643  
Fund:  Fundamental Research Funds for the Central Universities, China(DUT16RC(3)019);Recruitment Program of Global Youth Experts
Corresponding Authors: Fang CHENG     E-mail: ffcheng@dlut.edu.cn
Cite this article:

Fang CHENG,Mingyang LI,Wei HE,Hanqi WANG. Control of the Ligand Surface Density through Reaction Kinetics of Amino and Surface Vinyl Sulfone Groups. Acta Phys. -Chim. Sin., 2018, 34(2): 177-184.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201707121     OR     http://www.whxb.pku.edu.cn/Y2018/V34/I2/177

Fig Scheme 1 Schematic showing surface modification.
Fig 1 Chemical structures of catalysts.
Fig 2 Contact-angle titrations for (a) different catalysts and (b) different 2, 6-pyridinedicarboxylic acid concentrations.
Fig 3 (a) Representative photomicrographs of water droplets and (b) contact-angle titrations for 2, 6-pyridinedicarboxylic acid as the catalyst.
Fig 4 Natural logarithm of VS (vinyl sulfone) coverage.
Fig 5 Surface membrane potential.
Fig 6 XPS spectra of (1) VS surface and (2) ab-NTA surface. (a) S 2p; (b) C 1s; (c) N 1s.
Fig 7 SPR sensorgrams of protein interactions with the VS-ab-NTA surface. 1 was protein solution; 2 was 0.5 mol?L-1 imidazole solution; 3 was PBS.
Fig 8 Isothermal adsorption curve of ab-NTA surface base on VS(a) and NHS(b).
106Kd/mol-1Rmax/(refraction unit)
VS surface0.6693
NHS surface1.01457
Table 1 Kd and Rmax of ab-NTA surface base on VS and NHS.
Fig 9 Isothermal adsorption curve of the surface with different reaction time and catalyzed by2, 6-pyridinedicarboxylic acid and Triphenylphosphine.
CatalystTime/h106Kd/mol-1Rmax/(refraction unit)
10.51.13183
120.62504
1120.60693
2120.58282
Table 2 Kd and Rmax of ab-NTA surface with different reaction time and catalysts.
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