Asymmetric Hybrid Silica Nanomotors for Capture and Cargo Transport: Towards a Novel Motion-Based DNA Sensor

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2012-07, Vol.8 (13), p.2053-2059
• Main Authors: Simmchen, Juliane, Baeza, Alejandro, Ruiz, Daniel, Esplandiu, Maria José, Vallet-Regí, Maria
• Format: Article
• Language: English
• Subjects: Biosensing Techniques - methods; Catalase - chemistry; Catalase - metabolism; catalytic nanomotors; DNA - analysis; Fluorescence; hydrogen peroxide; Hydrogen Peroxide - chemistry; Nanotechnology - methods; self-assembly; sensors; Silicon Dioxide - chemistry
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201101593

An innovative self‐propelled nanodevice able to perform motion, cargo transport, and target recognition is presented. The system is based on a mesoporous motor particle, which is asymmetrically functionalized by the attachment of single‐stranded DNA onto one of its faces, while catalase is immobilized on the other face. This enzyme allows catalytic decomposition of hydrogen peroxide to oxygen and water, giving rise to the driving force for the motion of the whole system. Moreover the motor particles are able to capture and transport cargo particles functionalized with a noncomplementary single‐stranded DNA molecule, only if a specific oligonucleotide sequence is present in the media. Functionalization with characteristic oligonucleotide sequences in the system implies a potential for further developments for lab‐on‐chip devices with applications in biomedical applications. A novel hybrid nanomotor executes motion‐based detection of oligonucleotide sequences. The innovative nature of this approach arises from a DNA sandwich hybridization principle of motor and cargo, which enables the control of movement and transportation of a specific DNA analyte. The easily detectable cargo particle provides direct information of the presence of target biomolecules in the media.