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Beta amyloid (also known as Amyloid β or Aβ) is a 40–43 amino acid peptide cleaved from transmembrane amyloid precursor protein (APP) by proteases, beta-secretase (BACE-1) and gamma-secretase. Cleaved Aβ peptides [1-40], [1-42], [1-43] are extracellularly accumulated to form aggregates, insoluble oligomers and protofibrils called as neuritic plaques. The neuritic plaques are found in the brains of patients with Alzheimer’s disease (AD) and research indicates that intraneuronal beta amyloid accumulation may be an important proximal neurotoxic event in the pathogenesis of Alzheimer’s disease.