Advanced laser-induced graphene-based electrochemical immunosensor for the detection of C-reactive protein

C-reactive protein (CRP) is a critical biomarker for detecting inflammation and forecasting cardiovascular disease. We present an advanced electrochemical immunosensor utilizing laser-induced graphene (LIG)/MXene-gold nanoparticles (Mx-AuNPs) electrode for CRP detection. The Mx-AuNPs nanocomposite, synthesized via in-situ reduction of HAuCl₄ by MXene, leverages MXene's reducing properties for effective nanoparticle deposition, confirmed through scanning electron microscopy. This electrode demonstrates superior electrochemical performance due to enhanced surface area and synergy between LIG and Mx-AuNPs, improving overall electrode conductivity. The Anti-CRP antibody, immobilized via a cysteamine linker, enables CRP detection. The immunosensor achieves excellent detection across 10 pg mL^-1 to 10 µg mL^-1 CRP, with a low detection limit of 1.45 pg mL^-1, and shows high selectivity for CRP. This LIG/Mx-AuNPs-based immunosensor is promising for sensitive CRP detection, aiding early cardiovascular disease diagnosis and improving patient outcomes.