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SAXS and SANS are also popular methods for the size measurement of macromolecules. While they can be used with higher particle concentrations than DLS ($\sim$1-100~mg/ml) and are applicable to a large MW range from few kDa to hundreds of MDa, they have low resolution, and structural information can only be obtained through complex model building.\cite{Pecora_1985} Similar to DLS, SAXS and SANS measure scattering from unlabelled molecules which simplifies sample preparation but makes the results susceptible to artefacts arising from dust and other contamination in the sample solution, and makes these techniques impossible to be used with scattering media, such as tissue.
The measurement time interval of 5~$\mu$s used in these experiments is ideal for measuring the rotational correlation times of these drugs with this
Ru ruthenium-based dye at low viscosities. However,
if this approach is combined with
imaging, the long lifetime of the
dye, dye will require long pixel dwell
times are needed, times, making scanning-based data acquisition slow. We have recently developed wide-field lifetime imaging approaches \cite{Hirvonen2014_ol, Hirvonen2015_njp} that are ideally suited for measuring lifetimes at this time scale, and could image several wells containing different drugs and/or different viscosity solutions simultaneously.
These methods might If these microsecond-resolution wide-field time-correlated single photon counting approaches were to be combined with polarization-resolved excitation and detection, one could perform time-resolved anisotropy imaging on a microsecond time scale. This would benefit the
size measurement of similar or higher MW
drugs, drugs in several wells of a multiwell plate simultaneoulsly, and enable imaging these drugs \textit{in vitro}.