13C NMR spectroscopy: 13C NMR spectroscopy was
performed according to a slightly modified method of
Kennedy et al. [12]. The samples (100 mg/mL, 1:2
acetone-d6/D2O) were characterized by 13C NMR (100
MHz, Bruker AVANCETM spectrometer), with chemical
shifts in ppm referenced internally with acetone-d6. The
proton-decoupled, inverse-gated sequence, with 90о pulse
length (14s), 25125 Hz spectral width, 10K data points,
0.65 s acquisition time, relaxation delay of 4 s, 12 K scans,
and 5 Hz line broadening was carried out at a temperature
of 295.8 K.