Table 1.
The fitting models applied to, and the optimal main structural parameters extracted from, the SANS data from Ac-I3XGK-NH2 (X=Q, S, and N) as shown in Fig. 3
| Peptide & concentration | Ac-I3QGK-NH2 | Ac-I3SGK-NH2 | Ac-I3NGK-NH2 | |||
|---|---|---|---|---|---|---|
| 8 mM | 8 mM | 2 mM | 8 mM | 2 mM | 8 mM | |
| Fitting model | ECM a | ECM + ECM | ECM | ECM | ECM | ECM |
| p1_Minor Radius (Å) | 42 | 43 | 42 | 16.5 | 15.4 | 16 |
| σ/<radius>b | 0.16 | 0.15 | 0.12 | 0.03 | 0.05 | 0.08 |
| p1_Axial ratio | 4.8 | 5 | 4.8 | 7 | 6.7 | 11.5 |
| σ/< ratio> | 0.16 | 0.22 | 0.17 | 0.32 | 0.34 | 0.39 |
| p1_Length (Å) | > 1000 | > 1000 | > 1000 | > 1000 | > 1000 | >1000 |
| p2_Minor radius (Å) | / | 12 | / | / | / | / |
| p2_Axial ratio | / | 1.0 | / | / | / | / |
| p2_Length (Å) | / | 25 | / | / | / | / |
| χ2/Nptsc | 78.5 | 28.7 | 5.0 | 18.2 | 3.3 | 2.9 |
For clarity, other structural parameters are given in Supplementary Table 1. During the fitting process, the incorporation of size polydispersity into the minor radius and axial ratio of long and wide nanoribbons could improve the fitting quality but had little impact on their main structural parameters
aECM denotes the elliptical cylinder model
bσ = standard deviation of the lognormal distribution and < > = mean value
cχ2/Npts values were significantly decreased in the presence of size polydispersity for the minor radius and axial ratio of long and wide ribbons, in comparison with those assuming an absence of size polydispersity (Supplementary Table 1)