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Acta Biológica Colombiana

Print version ISSN 0120-548X

Abstract

MARIN, Paula A et al. Mycobacterium tuberculosis 38 kDa Antigen Purification and Potential Diagnostic Use by Piezoelectric Immunosensors. Acta biol.Colomb. [online]. 2015, vol.20, n.1, pp.129-139. ISSN 0120-548X.  http://dx.doi.org/10.15446/abc.v20n1.40731.

The selection and procurance of the immunoreagents used in the immunoassay and biofunctionalisation transducer strategy, are a key in the piezoelectric immunosensor development for the detection of tuberculosis (TB). Many have reported the use of 38kDa protein antigen (Ag38kDa) from Mycobacterium tuberculosis (Mtb) such as good biomarker of TB disease and compliance with physical and biochemical characteristics to be immobilized by self-assembled monolayers (SAMs), in the gold electrode of piezoelectrics crystals surfaces. A piezoelectric immunosensor developed from purified native antigens of Mtb may be an alternative simple method for detection of Mtb with speed and reusable advantages, contributing to the control and early treatment of disease. In this paper, the purification process of Ag38kDa Mtb from secretory proteins filtered culture (CFP) from Mtb is presented as an immunoreactive with potential application in the detection of Mtb by piezoelectric immunosensors. Functionalized crystals were obtained by using the modified self-assembled monolayers (SAMs) technique, with purified native antigen and CFP. The functionalized surfaces were qualitatively characterized using atomic force microscopy (AFM) in order to validate the immobilization protocol optimal conditions for secretion antigens from Mtb. These modified crystals may be coupled to piezoelectric immunosensor characterization system for detecting of Mtb by a direct competition immunoassay.

Keywords : AFM; antigen 38kDa; biosensors; immunoassay; immobilization; quartz crystal microbalance.

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