Empty polymersomes and polymersomes
loaded with 2 mM
Et and
COOMe were prepared,
as described previously. Samples then underwent buffer exchange to
deuterated PBS for SANS measurements (
Gibco PBS tablets (ThermoFisher
Scientific) dissolved in D
2O). Samples in PBS were passed
through a
PD MidiTrap column (GE Healthcare) equilibrated in deuterated
PBS. All of the measurements were performed at the ZOOM beamline of
the ISIS Pulsed Neutron Source at the Rutherford Appleton Laboratory,
Didcot, UK. A sample changer and 2 mm path length quartz cuvette cells
were used. The beamline was configured with L1 = L2 = 4 m, where L1
is the source to sample distance and L2 is the sample to detector
distance, yielding a scattering variable (
Q) range
of 0.004 to 1 Å
–1. Samples were measured at
15 μAmps (SANS) and 5 μAmps (TRANS) at 25 °C.
SANS data were reduced with MantidPlot.
53 (link) SasView v5.0.4. (
http://www.sasview.org/) was employed to fit the experimental data over a
q range of 0.01 <
q < 0.1 Å
–1 with a polydispersity of 0.1 on the radius and shell thickness.
Scattering length density (sld) of core, shell, and solvent were set
to to 6.3, 4, and 6.3 × 10
–6/Å
2, respectively.
Saunders C., Foote J.E., Wojciechowski J.P., Cammack A., Pedersen S.V., Doutch J.J., Barriga H.M., Holme M.N., Penders J., Chami M., Najer A, & Stevens M.M. (2023). Revealing Population Heterogeneity in Vesicle-Based Nanomedicines Using Automated, Single Particle Raman Analysis. ACS Nano, 17(12), 11713-11728.