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- W4383893272 abstract "Small molecule-binding aptamers often suffer from high cross reactivity to structure analogues in biological samples, limiting their value for clinical diagnosis. Herein, we present a method to overcome this issue, by performing binding-inhibited organic reaction-based regioselective selection of aptamers against homocysteine (Hcy), which is a marker for diagnosing many disorders including stroke and Alzheimer's. This approach has led to isolation of a DNA aptamer that binds to the alkane thiol chain of Hcy with exceptional specificity against cysteine. It also binds with oxidized Hcy at weaker affinity. Using this new aptamer, we produced a reusable fluorescent optical fiber aptasensor for direct and validated detection of both free and total Hcy in nondeproteinized patient plasma in the diagnostic concentration range. The binding site-specific aptamer selection and optical-fiber-sensing strategy can expand the practical utility of aptamers in clinical diagnosis." @default.
- W4383893272 created "2023-07-12" @default.
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- W4383893272 date "2023-10-01" @default.
- W4383893272 modified "2023-10-18" @default.
- W4383893272 title "Selection of regioselective DNA aptamer for detection of homocysteine in nondeproteinized human plasma" @default.
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- W4383893272 doi "https://doi.org/10.1016/j.bios.2023.115528" @default.
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