M. Hansler et al., THE APPLICATION OF THE CYSTEINE PROTEASE FICIN IN PEPTIDE-SYNTHESIS IN FROZEN AQUEOUS-SOLUTION, Die Pharmazie, 50(3), 1995, pp. 184-187
The capability of the cysteine protease ficin to form peptide bonds in
frozen aqueous solution is shown. Freezing of the reaction mixture re
sulted in increased peptide yields in kinetically controlled coupling
of ester substrates with leucine amide. The influence of temperature,
concentration of the amino component, pH before freezing and various s
olubilizing N-alpha-proctecting groups was studied.