A multipurpose capacitive biosensor for assay and quality control of human immunoglobulin G.
We report a flow-injection biosensor system with a capacitive transducer for assay and quality control of human immunoglobulin G (hIgG). The sensing platform is based on self-assembled monolayers (SAMs) of carboxylic acid terminated alkyl-thiols with covalently attached concanavalin A. The electrochemical characteristics of the sensor surface were assessed by cyclic voltammetry using a permeable redox couple (potassium ferricyanide). The developed biosensor proved capable of performing a sensitive label-free assay of hIgG with a detection limit of 1.0 microg mL(-1). The capacitance response depended linearly on hIgG concentration over the range from 5.0 to 100 microg mL(-1), in a logarithmic plot. Typical measurements were performed in 15 min and up to 18 successive assays were achieved without significant loss of sensitivity using a single electrode. In addition, the biosensor can detect hIgG aggregates with concentrations as low as 0.01% of the total hIgG content (5.0 microg mL(-1)). Hence, it represents a potential post-size-exclusion chromatography-UV (post-SEC-UV) binding assay for in-process quality control of hIgG, which cannot be detected by SEC-UV singly at concentrations below 0.3% of the total hIgG content.
Labib
Mahmoud
M
Department of Biotechnology, Lund University, Box 124, 22100 Lund, Sweden.
Hedström
Martin
M
Amin
Magdy
M
Mattiasson
Bo
B
D015374:Biosensing Techniques / Q000379:methods*; D003208:Concanavalin A / Q000378:metabolism; D025802:Electric Capacitance; D004566:Electrodes; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis*; D012680:Sensitivity and Specificity
D007074:Immunoglobulin G; D003208:Concanavalin A