Schematic overview of the immuno‐infrared‐sensor, the assay read‐out, and BioFINDER and ESTHER study design Schematic overview of the immuno‐infrared‐sensor,

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Schematic overview of the immuno‐infrared‐sensor, the assay read‐out, and BioFINDER and ESTHER study design Schematic overview of the immuno‐infrared‐sensor, the assay read‐out, and BioFINDER and ESTHER study design The immuno‐infrared‐sensor simultaneously monitors the secondary structure distribution of all soluble Aβ peptides in blood plasma caught by monoclonal antibodies (mAb) covalently attached to the sensor surface (schematic simplified representation; mAb A8978 is raised against the middle epitope (aa13–28) of Aβ). If the marker band (amide I) is dominated by disordered or α‐helical monomeric isoforms, the patients would be diagnosed as non‐AD (blue). If β‐sheet isoforms are enriched (red), the amide I signal is shifted below the threshold (1,642 cm−1), indicating AD.Plasma samples from the cross‐sectional study (BioFINDER) were measured with the immuno‐infrared‐sensor and used to differentiate between 37 healthy elderly people (all PET negative) and 36 prodromal AD (MCI) patients (all PET positive). The clinical record of participants within this cohort comprised cognitive testing, CSF biomarker assessment, other clinical measures, 3 Tesla MRI, genetics, epidemiology and [18F]‐flutemetamol PET scanning.Nested case–control study based on the ESTHER cohort study as of January 2016. Baseline blood plasma samples from the year 2000–2002 were measured in the same way as samples from the BioFINDER cohort. AD = Alzheimer's disease; VD = vascular dementia; MD = mixed dementia are investigated. Other dementia forms include frontotemporal dementia and other dementias. GPs = general practitioners; yr = year; FU = follow‐up. The number of randomly selected controls and dementia cases reflects the original study design; the measured sample sizes are depicted in brackets. Andreas Nabers et al. EMBO Mol Med. 2018;emmm.201708763 © as stated in the article, figure or figure legend