Analog number | Amino acid residues | N-term | Purity (%) | MSc |
---|
 |
Xa
29
|
Xa
29'
|
Xb
|
Xc
|
DOTA
|
HPLC
a
|
CZE
b
|
calc
|
obs
|
1
| Asn | Asn | Tyr | Leu | No | 98 | 98 | 2,389.2 | 2,390.3 |
2
| Asn | Asn | Tyr | Leu | Yes | 97 | 96 | 3,161.6 | 3,162.6 |
3
| Asn | Asn | Trp | Nle | No | 94 | 90 | 2,435.2 | 2,436.5 |
4
| Asn | Asn | Trp | Nle | Yes | 95 | 92 | 3,207.6 | 3,208.8 |
5
| Dpr | Dpr | Trp | Nle | No | 99 | 96 | 2,379.3 | 2,380.1 |
6
| Dpr(DOTA) | Dpr(DOTA) | Trp | Nle | No | 94 | 93 | 3,151.6 | 3,152.4 |
7
| Dpr | Asn | Trp | Nle | No | 99 | 99 | 2,407.3 | 2,408.5 |
8
| Dpr(DOTA) | Asn | Trp | Nle | No | 98 | 97 | 2,793.5 | 2,794.9 |
9
| Lys | Lys | Trp | Nle | No | 88 | 84 | 2,463.4 | 2,464.5 |
10
| Lys(DOTA) | Lys(DOTA) | Trp | Nle | No | 92 | 96 | 3,236.3 | 3,236.8 |
11
| Lys (DOTA) | Asn | Trp | Nle | No | 83d
| 83 | 2,834.5 | 2,835.3 |
-
aPercentage purity determined by HPLC using buffer system: A = TEAP (pH 2.5) and B = 60% CH3CN/40% A with a gradient slope of 1% B/min, at flow rate of 0.2 mL/min on a Vydac C18 column (0.21 cm × 5 cm, 5-μm particle size, 300-Å pore size). Detection at 214 nm. bPercentage purity determined by capillary zone electrophoresis (CZE) using a Beckman P/ACE System 2050; field strength of 15 kV at 30°C. Buffer, 100 mM sodium phosphate (85:15, H2O:CH3CN), pH 2.50, on a Agilent μSil bare fused-silica capillary (75 μm i.d. × 40 cm length). Detection at 214 nm. cMALDI mass spectral analysis (m/z). The observed [M + H]+ of the monoisotopic mass (obs) compared with the calculated m/z of the monoisotope (calc). dThe detectable contaminant, produced during the dimerization process of this heterodimer, was identified as analog 3.