Table 1.
Gas-chromatographic enantioseparation of synthetic peptides and of peptides from the partial hydrolyzate of champacyclin (1a) as N-trifluoroacyl dipeptide methyl esters on a Chirasil®-(l)-Val column.
| Synthetic Dipeptides | Retention Times Rt (min) of Synthetic Dipeptides | Dipeptides from the Partial Hydrolyzate (1a) | Retention Times Rt (min) of Dipeptides from the Partial Hydrolyzate (1a) |
|---|---|---|---|
| (L)Ile-(D)Ala | 20.00 | (L)Ile-(D)Ala | 19.97 |
| (AlloD)Ile-(D)Ala | 20.35 | ||
| (L)Ile-(L)Ala | 20.40 | ||
| (AlloD)Ile-(L)Ala | 20.45 | ||
| (L)Ile-(L)Ile | 22.55 | (L)Ile-(L)Ile | 22.53 |
| (AlloD)Ile-(L)Ile | 23.40 | ||
| (L)Ile-(AlloD)Ile | 22.65 | ||
| (AlloD)Ile-(AlloD)Ile | 22.90 | ||
| (L)Ile-(D)Leu | 24.30 | ||
| (L)Ile-(L)Leu | 23.75 | ||
| (AlloD)Ile-(D)Leu | 24.90 | ||
| (AlloD)Ile-(L)Leu | 25.05 | ||
| (D)Leu-(L)Ile | 24.75 | (D)Leu-(L)Ile | 24.61 |
| (D)Leu-(AlloD)Ile | 24.00 | ||
| (L)Leu-(AlloD)Ile | 23.30 | ||
| (L)Leu-(L)Ile | 22.05 | ||
| (D)Leu-(D)Leu | 25.90 | ||
| (D)Leu-(L)Leu | 26.20 | ||
| (L)Leu-(L)Leu | 24.25 | ||
| (L)Leu-(D)Leu | 24.75 | ||
| (L)Ile-(D)Phe | 46.75 | (L)Ile-(D)Phe | 46.68 |
| (AlloD)Ile-(D)Phe | 44.80 | ||
| (L)Ile-(L)Phe | 40.90 | ||
| (AlloD)Ile-(L)Phe | 49.30 |