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001016762 1001_ $$0P:(DE-Juel1)187004$$aHu, Ziheng$$b0$$ufzj
001016762 245__ $$aTruncated Electrochemical Aptasensor with Enhanced Antifouling Capability for Highly Sensitive Serotonin Detection
001016762 260__ $$aBasel$$bMDPI$$c2023
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001016762 520__ $$aAccurate determination of serotonin (ST) provides insight into neurological processes and enables applications in clinical diagnostics of brain diseases. Herein, we present an electrochemical aptasensor based on truncated DNA aptamers and a polyethylene glycol (PEG) molecule-functionalized sensing interface for highly sensitive and selective ST detection. The truncated aptamers have a small size and adopt a stable stem-loop configuration, which improves the accessibility of the aptamer for the analyte and enhances the sensitivity of the aptasensor. Upon target binding, these aptamers perform a conformational change, leading to a variation in the Faraday current of the redox tag, which was recorded by square wave voltammetry (SWV). Using PEG as blocking molecules minimizes nonspecific adsorption of other interfering molecules and thus endows an enhanced antifouling ability. The proposed electrochemical aptamer sensor showed a wide range of detection lasting from 0.1 nM to 1000 nM with a low limit of detection of 0.14 nM. Owing to the unique properties of aptamer receptors, the aptasensor also exhibits high selectivity and stability. Furthermore, with the reduced unspecific adsorption, assaying of ST in human serum and artificial cerebrospinal fluid (aCSF) showed excellent performance. The reported strategy of utilizing antifouling PEG describes a novel approach to building antifouling aptasensors and holds great potential for neurochemical investigations and clinical diagnosis
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001016762 7001_ $$0P:(DE-Juel1)180239$$aZhu, Ruifeng$$b1$$ufzj
001016762 7001_ $$0P:(DE-Juel1)171348$$aFigueroa-Miranda, Gabriela$$b2
001016762 7001_ $$0P:(DE-HGF)0$$aZhou, Lei$$b3
001016762 7001_ $$0P:(DE-Juel1)157885$$aFeng, Lingyan$$b4
001016762 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, Andreas$$b5
001016762 7001_ $$0P:(DE-Juel1)128707$$aMayer, Dirk$$b6$$eCorresponding author
001016762 773__ $$0PERI:(DE-600)2662125-3$$a10.3390/bios13090881$$gVol. 13, no. 9, p. 881 -$$n9$$p881 -$$tBiosensors$$v13$$x2079-6374$$y2023
001016762 8564_ $$uhttps://juser.fz-juelich.de/record/1016762/files/biosensors-13-00881.pdf$$yOpenAccess
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