The amyloid hypothesis was proposed for the first time in 1991 but now, it’s still one of the best scientifically supported for AD (Carrillo-Mora, Luna, & Colin-Barenque, 2014). Amyloid-ß, a small peptide having 39 to 42 amino acid residues is enzymatically digested from membrane-attached type-1 protein, called amyloid precursor protein (APP). The aggregations of Aβ into fibrillary plaques play a key role in the AD pathogenesis. Aβ40 and Aβ42 isoforms are the major constituents of amyloid plaques. Aβ42 being the most common and more fibrillogenic and prone to pathological states. Aβ peptides accumulated in brain will also be released into the bloodstream and can be used as biomarker of AD (Takata et al., 2008). Current techniques for determination of Aβ in biological samples include western blotting and ELISA require skilled personnel who are available only in large research facilities, which make these approaches not ideal for mass population or point of care (POC) diagnostics. Biosensor, the devices consists only two main parts including recognition element and transducer element connected to detector for signal analysis, is proposed in this study as an alternative platform of Aβ detection.
2 There are few biosensor researches referred to Aβ detection, the study based