Ipamorelin Testing: HPLC Purity and Identity Verification

Ipamorelin Testing Overview

Ipamorelin is a pentapeptide growth hormone secretagogue with a molecular weight of 711.86 Da. Its small size makes it one of the easier peptides to synthesize and test. However, quality still varies between vendors, and independent testing is recommended.

HPLC Purity Analysis

Ipamorelin's small size means it elutes quickly on reverse-phase HPLC, and impurities are typically well-separated. Purity standards:

• ≥98% for research grade
• Below 95% indicates synthesis problems

Look for a clean, single dominant peak. Multiple small peaks suggest incomplete coupling during synthesis.

LC-MS Identity Confirmation

The molecular weight of ipamorelin is 711.86 Da. LC-MS confirms identity by matching the measured mass. Because ipamorelin is small, the mass measurement is highly accurate, and even single amino acid substitutions are detectable.

Common Ipamorelin Issues

• Amino acid substitution: Wrong amino acid incorporated during synthesis. Detected as a mass shift of 14-100 Da depending on the substitution.
• Truncation: 4-amino-acid or 3-amino-acid fragments. These appear as lower-mass peaks in LC-MS.
• racemization: D-amino acid incorporation. Not detectable by LC-MS alone but visible as peak splitting in some HPLC methods.