Under buffer SFM observation of immunospecies adsorbed on a cyano grafted silicon substrate.
Scanning force microscopy (SFM) in contact mode and in liquid medium has been employed to study immunospecies layers adsorbed on a silicon wafer. The silicon wafer has been grafted with a cyanosilane monolayer in order to create a surface with strong adhesive properties which prevent proteins being swept by the scan of the SFM tip. The force curves reveal that the adhesive force has been increased by a factor six without roughness modification (< 1 nm). After the incubation of the surface in a monoclonal antibody (mouse anti-human alpha-fetoprotein IgG) solution, SFM surface images suggest an homogeneous layer composed by ellipsoidal objects (40-60 nm in diameter, 6-13 nm in height). The substrate was moreover incubated in an antigenic solution (human alpha-fetoprotein): SFM images reveal that proteins have been added onto the antibody layer.
Mazeran
P E
PE
Laboratoire de Tribologie et Dynamique des Systèmes, URA CNRS 855, Ecole Centrale de Lyon, Ecully, France.
Loubet
J L
JL
Martelet
C
C
Theretz
A
A
D000911:Antibodies, Monoclonal; D002021:Buffers; D018625:Microscopy, Atomic Force / Q000379:methods*; D012821:Silanes; D012825:Silicon; D000509:alpha-Fetoproteins / Q000276:immunology / Q000648:ultrastructure
D000911:Antibodies, Monoclonal; D002021:Buffers; D012821:Silanes; D000509:alpha-Fetoproteins; C097372:cyanopropyl dimethyl dimethylamino silane; D012825:Silicon