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The diagnosis of AD begins with cognitive symptoms such as mild cognitive impairment (MCI) but requires the demonstration and quantification of the underlying neuropathological processes through the measurement of specific biomarkers. Among these, the phosphorylated tau protein at threonine 181 (p\u2010tau 181) is considered specific for AD diagnosis in people with MCI. In this work, we report the detection of p\u2010tau 181 spanning from physiological to pathological concentrations in cerebrospinal fluids from patients with MCI. The proposed sensor is based on an electrolyte\u2010gated organic transistor functionalized with specific anti\u2010p\u2010tau 181 antibodies. We analyzed the multiparametric sensor response using a Langmuir model to extract the thermodynamic affinity constant, resulting in values between 10\n                    <jats:sup>12<\/jats:sup>\n                    and 10\n                    <jats:sup>13<\/jats:sup>\n                    . The sensor response is then correlated with the gray matter volume of the same patients from Magnetic Resonance Imaging: the resulting maps show areas in the brain where the gray matter density decreases with increasing levels of p\u2010tau in CSF.\n                  <\/jats:p>","DOI":"10.1002\/adhm.71634","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T10:16:03Z","timestamp":1787825763000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Quantification of Phosphorylated Tau Protein in Alzheimer's Disease Patients\u2019 Fluids With Electrolyte\u2010Gated Organic Transistor Biosensors"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3356-8829","authenticated-orcid":false,"given":"Marcello","family":"Berto","sequence":"first","affiliation":[{"name":"Dipartimento di Scienze Della Vita Universit\u00e0 di Modena and Reggio Emilia  Modena 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