Physical characterizations and HPLC analysis of peptides containing histidine and aspartic acid. The solubilities of peptides were tested in water and confirmed by their charges at the iso-electric point (pI values).
| Peptide | % Yield | Morphology | Solubility | Charge | pI | R T/min | % Purity |
|---|---|---|---|---|---|---|---|
| P1 | 74.0 | White, sticky powder | Hydrophilic | 0.1 | 7.57 | 42.6 | 81.7 |
| P2 | 74.2 | Yellow powder | Hydrophilic | 0.1 | 7.57 | 24.0 | 84.1 |
| P3 | 83.1 | White powder | Hydrophilic | 0.1 | 7.57 | 23.9 | 73.4 |
| P4 | 69.9 | White powder | Hydrophilic | 0.1 | 7.88 | 7.24 | 99.5 |
| P5 | 65.6 | Pale yellow powder | Hydrophilic | 0.1 | 8.26 | 7.69 | 99.2 |