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Graphene oxide (GO) is often quantified via its UV absorption, typically at around 230 nm. This is convenient but the effect of the size of GO on the accuracy of this method has been ignored so far. The authors report that the molar absorbance of GO is size-dependent. Data are presented on the absorbance of small (hydrodynamic diameter 1 μm), medium sized (1.5 μm), and large (2.2 μm) GO particles...
We describe a sensitive sandwich immunoassay for alpha-fetoprotein (AFP). It is making use of gold nanoparticles (GNPs) and magnetic beads (MBs) as labels, and of resonance Rayleigh scattering for detection. Two antibodies were labeled with GNPs and MBs, respectively, and MB-antigen-GNP complexes were formed in the presence of antigens. The MB labels also serve as solid phase carriers that can be...
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