Fig. 5. For dipeptides that do not form viscous solutions at high pH, only the individual enantiomers form gels when the pH is decreased. On the left, the rheology with time is shown for (a) (l)-; (b) (d)-; (c) (mix)-; (d) (rac)-2NapVG (structure top right with chiral centre shown by *). The photographs show the final materials after 18 hours.
