Detection of lysozyme magnetic relaxation switches based on aptamer-functionalized superparamagnetic nanoparticles.

ABSTRACT: Magnetic relaxation switch (MRSw) detection is based on aggregate formation or dissociation when magnetic nanoparticles (MNPs) bind to target molecules. In the aggregated state, the dephasing rate of nearby proton spins is higher than in the dispersed state, resulting in a decrease in the spin-spin relaxation time, T(2). In this work, an MRSw-based nanosensor for lysozyme (Lys) protein detection was achieved using iron oxide nanoparticles conjugated with either Lys aptamer or linker DNA, which can hybridize with the extended part of the aptamer to form clusters. Upon the addition of Lys, the aptamers bind with their targets, leading to disassembly of clusters and an increase in T(2). A detection limit in the nanomolar range was achieved for Lys detection in both buffer and human serum. The

SUBMITTER: Bamrungsap S 

PROVIDER: S-EPMC3229930 | biostudies-literature | 2011 Oct

REPOSITORIES: biostudies-literature