AssayIndex
Cross-section

Exenatide impurity profile

Every named species the index has reported alongside Exenatide, 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.

36 recordsmedian 98.94 %spec 98.0 %
Median total impurities 1.06% n=36
Median largest single 0.49% n=36
Worst single observed 1.30% n=36
Named species observed 5 / 5 n=5
Named speciesΔRT (min)Δ mass (Da)Seen inMedian % areaMax % area
des-Gly1 truncate (−57 Da)-0.42-57.02197%0.070.62
Trp25 oxidation (+16 Da)-0.71+15.99594%0.190.94
truncated (1-38)-0.55-156.10189%0.071.23
C-terminal free acid (+1 Da)+0.34+0.98486%0.201.30
Met14 sulfoxide (+16 Da)-0.88+15.99581%0.100.80

des-Gly1 truncate (−57 Da)

Retention offset from the main peak
-0.42 min on RG-2
Mass difference
-57.021 Da
Reported in
35 of 36 records (97 %)
Level when reported
median 0.07 %, max 0.62 %
Resolution requirement
Baseline-resolved on the reference method.

Trp25 oxidation (+16 Da)

Retention offset from the main peak
-0.71 min on RG-2
Mass difference
+15.995 Da
Reported in
34 of 36 records (94 %)
Level when reported
median 0.19 %, max 0.94 %
Resolution requirement
Baseline-resolved on the reference method.

truncated (1-38)

Retention offset from the main peak
-0.55 min on RG-2
Mass difference
-156.101 Da
Reported in
32 of 36 records (89 %)
Level when reported
median 0.07 %, max 1.23 %
Resolution requirement
Baseline-resolved on the reference method.

C-terminal free acid (+1 Da)

Retention offset from the main peak
+0.34 min on RG-2
Mass difference
+0.984 Da
Reported in
31 of 36 records (86 %)
Level when reported
median 0.20 %, max 1.30 %
Resolution requirement
Baseline-resolved on the reference method.

Met14 sulfoxide (+16 Da)

Retention offset from the main peak
-0.88 min on RG-2
Mass difference
+15.995 Da
Reported in
29 of 36 records (81 %)
Level when reported
median 0.10 %, max 0.80 %
Resolution requirement
Baseline-resolved on the reference method.

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.

  • Met14 oxidation — the dominant route, and the reason exenatide should be shipped cold
  • C-terminal amide hydrolysis in acidic solution