Details

Autor(en) / Beteiligte

• Zhu, Fulin
• Bian, Xiaojun
• Zhang, Hongcai
• Wen, Yanli
• Chen, Qian
• Yan, Yongliang
• Li, Liang
• Liu, Gang
• Yan, Juan

Titel

Controllable design of a nano-bio aptasensing interface based on tetrahedral framework nucleic acids in an integrated microfluidic platform

Ist Teil von

• Biosensors & bioelectronics, 2021-03, Vol.176, p.112943-112943, Article 112943

Ort / Verlag

England: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• The limited reaction time and sample volume in the confined space of microfluidic devices give considerable importance to the development of more effective biosensing interfaces. Herein, the self-assembling of tetrahedral framework nucleic acids (FNAs) with controllable size on the interface of the microfluidic microchannels is studied. Compared with macroscopic turbulence control on traditional micro-structured microfluidic surface, the novel FNA-engineered microfluidic interface successfully constructs a 3D reaction space at nanoscale by raising DNA probes away from the surface. This FNA interface dramatically improves the reaction kinetics during molecular recognition due to extremely ordered orientation, configuration and density of DNA probes on the surface. Finally, the FNA-engineered interface is applied in a novel multi-functional microfluidic platform, towards a “one-stop” assay of Escherichia coli O157: H7 (E. coli O157: H7), integrating capture, release, enrichment, cell culture and antimicrobial susceptibility testing (AST). With the FNA-aptamer probe, we achieved an enhanced bacterial detecting efficiency (10 CFU/mL) plus excellent selectivity and precision. The appicability was strongly demonstrated when the biosensor was successfully applied in real samples, including the analysis of antibiotic susceptibility and minimum inhibitory concentration (MIC) of E. coli O157: H7 among different antibiotics. The application of FNA interface will open a wide avenue for the development of microfluidic biosensors for other pathogenic microorganisms or circulating tumor cells (CTC) simply by changing the aptamers. [Display omitted] •A tetrahedral framework nucleic acids-based aptasensing interface has been constructed in the microfluidic system.•The development of an integrated microfluidic platform for bacterial detection, cell culture, and AST activities.•A desirable detection sensitivity (as low as 10 CFU/mL) and specificity for E. coli O157: H7.•The platform was able to provide fast (within 5 h) and reliable analysis of AST.