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Human C-reactive protein (CRP) and lactate dehydrogenase are important markers in clinical laboratory testing-the former is used to detect in vivo inflammation, and the latter is used to detect cell necrosis and tissue destruction. We developed aptamers that bind to human CRP and human lactate dehydrogenase-5 (LDH-5) with high affinities (dissociation constants of 6.2 pM and 235 pM, respectively), applying the systematic evolution of ligands by exponential enrichment (SELEX) method, and by using a modified DNA library containing the following base-appended base modifications: analog adenine derivative at the fifth position of uracil (U ad ), analog guanine derivative at the fifth position of uracil (U gu ), and analog adenine derivative at the seventh position of adenine (A ad ). A potential application of these aptamers as sensor elements includes high-sensitivity target detection in point-of-care testing.

Modified DNA Aptamers for C-Reactive Protein and Lactate Dehydrogenase-5 with Sub-Nanomolar Affinities