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Studies on the pragmatic performance and validity of a plasma amyloid β measurement system by immunoprecipitation‐mass spectrometry

The measurement of plasma amyloid β recently attracts much attention as a biomarker of Alzheimer’s disease. We developed a highly sensitive method for simultaneous detection of a plurality of amyloid β peptides in human plasma by using immunoprecipitation combined with matrix‐assisted laser desorption ionization time‐of‐flight mass spectrometry (IP‐MALDI‐MS). In this study, we examined the effects of interfering substances in human plasma to reinforce the performance and practicability of this approach.