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A selective colorimetric assay for spermine was proposed in this work. In a weak alkaline medium, the conformational structure of double-stranded calf thymus DNA (ctDNA) was loosened to install gold nanoparticles (AuNPs) into chains. While, the chain assembly of AuNPs could form cross-linking aggregates when spermine was present, which was attributed to the electrostatic interaction between the positive...
As a new class of anisotropic nanomaterial, gold nanorods (AuNRs) have received much attention due to their unique optical and photothermal properties. Much different from the spherical nanoparticles, AuNRs display two characteristic transverse and longitudinal surface plasmon absorption bands. This absorbed light is able to act as the energy acceptors in the fluorescence resonance energy transfer...
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