Selank impurity profile
Every named species the index has reported alongside Selank, how often, at what level, and what its presence implies about the synthesis or the handling. Reporting threshold is 0.05 % area; anything below it is invisible to this page and is silently added to the main peak.
Median total impurities
0.41%
n=102
Median largest single
0.20%
n=102
Worst single observed
1.40%
n=102
Named species observed
4 / 4
n=4
| Named species | ΔRT (min) | Δ mass (Da) | Seen in | Median % area | Max % area |
|---|---|---|---|---|---|
| tuftsin fragment (−417 Da) | -0.62 | -417.235 | 98% | 0.12 | 0.95 |
| diketopiperazine (−18 Da) | +0.18 | -18.011 | 89% | 0.06 | 0.55 |
| acetyl adduct (+42 Da) | +0.34 | +42.011 | 84% | 0.09 | 0.67 |
| des-Thr (−101 Da) | -0.26 | -101.048 | 83% | 0.10 | 1.40 |
tuftsin fragment (−417 Da)
- Retention offset from the main peak
- -0.62 min on RG-2
- Mass difference
- -417.235 Da
- Reported in
- 100 of 102 records (98 %)
- Level when reported
- median 0.12 %, max 0.95 %
- How it separates
- Baseline-resolved on the reference method.
diketopiperazine (−18 Da)
- Retention offset from the main peak
- +0.18 min on RG-2
- Mass difference
- -18.011 Da
- Reported in
- 91 of 102 records (89 %)
- Level when reported
- median 0.06 %, max 0.55 %
- How it separates
- Close-eluting on the reference method, and merged with the main peak on a short gradient. The index prints the resolution figure for such a pair and applies no criterion to it — where the two are not separated, what matters is that the integration convention is stated.
acetyl adduct (+42 Da)
- Retention offset from the main peak
- +0.34 min on RG-2
- Mass difference
- +42.011 Da
- Reported in
- 86 of 102 records (84 %)
- Level when reported
- median 0.09 %, max 0.67 %
- How it separates
- Baseline-resolved on the reference method.
des-Thr (−101 Da)
- Retention offset from the main peak
- -0.26 min on RG-2
- Mass difference
- -101.048 Da
- Reported in
- 85 of 102 records (83 %)
- Level when reported
- median 0.10 %, max 1.40 %
- How it separates
- Close-eluting on the reference method, and merged with the main peak on a short gradient. The index prints the resolution figure for such a pair and applies no criterion to it — where the two are not separated, what matters is that the integration convention is stated.
Degradation pathways
Degradants are a handling finding rather than a synthesis finding. A lot that shipped clean and arrived oxidised tells you about the courier, not the chemist.
- diketopiperazine formation from Pro-rich sequence
- no oxidative liability