Fig. 2. Enantioselective crystallization of asparagine (Asn). (A) A racemic solution of asparagine crystallized on a Ni/Au surface (120 nm/10 nm). In red are d-Asn·H2O crystals, in blue are l-Asn·H2O crystals, as measured by CD. The dotted lines denote the area of the magnet located underneath. + and – indicate a magnet aligned N or S, respectively. (B) The amount of l-Asn (blue) and d-Asn (red) crystals in each half of the wafer. (C) Typical CD spectra of l-Asn (blue) and d-Asn (red) crystals collected from the substrate. (D) The experiment performed with pure l-Asn using the experimental configuration as shown in Fig. 1C. Crystals are formed first on the magnet pointing S. (E) The experiment performed with pure d-Asn using the experimental configuration as shown in Fig. 1C. Crystals are formed first on the magnet pointing N. The plots (F) and (G) show the growth rate of the crystals on the two magnets, pointing either S or N, for the enantiopure solution of l- or d-Asn, respectively.
