{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T18:28:53Z","timestamp":1783535333822,"version":"3.55.0"},"reference-count":55,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,11,19]],"date-time":"2024-11-19T00:00:00Z","timestamp":1731974400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2025,1,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Measuring quinine is critical for the detection of its overdose, understanding its pharmacological and toxicological effects, and monitoring its pollution. While a previously reported aptamer named MN4 can bind quinine, it was not selected for it, leading to compromised binding affinity and specificity. In this work, a new quinine aptamer was isolated using the library immobilization capture\u2010SELEX technique. The Q1 aptamer has a\n                    <jats:italic>K<\/jats:italic>\n                    <jats:sub>d<\/jats:sub>\n                    value of 10\u2005nM determined by an isothermal titration calorimetry experiment and 45\u2005nM in a fluorescence binding assay. A 3.5\u2005nM quinine limit of detection was obtained based on the aptamer binding\u2010induced quenching of the intrinsic fluorescence of quinine. A large blue shift in fluorescence was observed for quinine upon binding to Q1, whereas binding to MN4 led to a very small red shift, indicating different ways of quinine binding by these two aptamers. Q1 did not bind cocaine based on NMR spectroscopy and fluorescence assays also indicated excellent selectivity against other tested molecules. This work has supplied a high affinity aptamer for quinine that can be useful for its detection and fundamental aptamer binding studies. It also highlights the advantages of using capture\u2010SELEX to isolate aptamers for small molecules.\n                  <\/jats:p>","DOI":"10.1002\/chem.202403435","type":"journal-article","created":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T12:18:28Z","timestamp":1729685908000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["An Ultrahigh Affinity DNA Aptamer for Quinine and Its Intrinsic Fluorescence Based Label\u2010Free Detection"],"prefix":"10.1002","volume":"31","author":[{"given":"Meheta","family":"Datta","sequence":"first","affiliation":[{"name":"Department of Chemistry Waterloo Institute for Nanotechnology University of Waterloo, Waterloo  Ontario N2L 3G1 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-3086-9124","authenticated-orcid":false,"given":"Yunus A.","family":"Kaiyum","sequence":"additional","affiliation":[{"name":"Department of Chemistry York University  4700 Keele St., Toronto Ontario M3J 1P3 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5573-4891","authenticated-orcid":false,"given":"Philip E.","family":"Johnson","sequence":"additional","affiliation":[{"name":"Department of Chemistry York University  4700 Keele St., Toronto Ontario M3J 1P3 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5918-9336","authenticated-orcid":false,"given":"Juewen","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Waterloo Institute for Nanotechnology University of Waterloo, Waterloo  Ontario N2L 3G1 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,11,19]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/C8AY00585K"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.microc.2024.110109"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.microc.2023.108839"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajh.24314"},{"key":"e_1_2_8_5_1","first-page":"19","volume":"10","author":"Lewallen L. 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