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Revista mexicana de física
Print version ISSN 0035-001X
Rev. mex. fis. vol.52 suppl.2 México Feb. 2006
Optical sensor for the quantification of monoclonal antibodies
B. Riquelmeª , b, O. Rubioª, and J. Valverdeª , b
ª Facultad de Cs. Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina email: riquelme@ifir.ifir.edu.ar
b Óptica Aplicada a la Biología, Instituto de Física Rosario (CONICETUNR), Rosario, Argentina email: orubio@fbioyf.unr.edu.ar , nitavalverde@yahoo.com.ar
Recibido el 27 de octubre de 2004
Aceptado el 25 de mayo de 2005
Abstract
An optical sensor for the quantification of a monoclonal antibody (MoAb) in solution by the reflectometry technique is shown in this work. A silicon wafer was chosen as a reflecting surface. An amount of AB blood group antibody (antiAB) is added to the sample when the pseudoBrewster angle of incidence has been fixed. The reflected laser intensity is registered in real time as the protein is being adsorbed onto the wafer. The mathematical analysis of the results verifies that the antibody adsorption follows Langmuir's kinetics. From the curve analysis, the parameters related to the antiAB concentration are extracted and the calibration curve is constructed. This curve allows us to obtain the desired commercial antiserum quantification.
Keywords: Laser reflectometry; immunosensor; Langmuir adsorption.
Resumen
Se presenta un sensor óptico basado en la técnica de reflectometría láser, para la cuantificación de anticuerpos monoclonales (MoAb) antiAB en solución. Se eligió como superficie reflectante una oblea de silicio. Fijado el ángulo de pseudo Brewster, se agrega una cantidad de antiAB. Se registra la intensidad láser reflejada en función del tiempo a medida que la proteína es adsorbida. El análisis matemático de los resultados verifica que la adsorción de anticuerpos sigue la cinética de Langmuir. Se calculan parámetros relacionados con la concentración de antiAB con los que se construye una curva de calibración que permite cuantificar anticuerpos monoclonales en solución.
Descriptores: Reflectometría láser; inmunosenor; adsorción de Langmuir.
PACS: 42.81.Pa; 71.45.Gm; 87.64.t; 78.40.q ; 78.40.q; 87.15.Rn
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Acknowledgments
In memory of Dr. Rodolfo José Rasia, who guided us in these investigations and whose important contributions to this work have been essential.
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