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Therefore, development of a specific, yet non-antibody-based method for simultaneous detection of A beta 40 and A beta 42 may have considerable clinical applications. Here, we developed a 'nanoparticle-based colorimetric sensor array' utilizing label-free gold and silver nanoparticles for visual detection of A beta 42 and A beta 40. Different aggregation behaviors of nanoparticles through their conjugation with A beta 42 and A beta 40 followed by the coordination of A beta 42 and A beta 40 with Cu(II) led to diverse spectral and color changes. The spectral changes were quantitatively differentiated by a supervised pattern recognition approach, linear discriminant analysis (LDA). The proposed sensor array was able to discriminate among A beta 42, A beta 40, and HSA in different concentrations (50 nmol L-1 to 500 nmol L-1) and their mixtures. Moreover, the sensor array had the capability to identify structurally similar A beta peptides in human plasma samples. 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