565404.fig.002a
(a)
565404.fig.002b
(b)
565404.fig.002c
(c)
565404.fig.002d
(d)
Figure 2: Dependence of the 17O chemical shift (ppm from H2O) of L-alanine and L-proline on the molar fraction X of DMSO at various pH values. (a) L-alanine at pH 7.4 (■) and pH 11.9 (□), (b) L-proline at pH 8.3 (■) and pH 13.0 (□), (c) L-alanine at pH 1.5, and (d) L-proline at pH 1.0. (Adapted, with permission, from Biochem. Biophys. Res. Commun. [9]. Copyright 1986, Academic Press, Inc.).