Certificates of Analysis

A Certificate of Analysis (COA) is the original laboratory report issued by an independent analytical laboratory after testing a specific production lot. It includes the HPLC purity result, mass spectrometry identity confirmation, the chemist’s signature, and the analysis date. Every Spartan Peptides COA linked above is the unaltered report from MZ Biolabs.

Most peptide suppliers reference purity standards without providing the underlying lab reports. Spartan publishes every COA because the actual document is the only way a researcher can independently verify what was tested, by whom, and what the results show. The report itself is the proof.

The first page usually shows the compound, lot number, analysis date, and HPLC purity result. The HPLC chromatogram graph shows separation of the target peptide from impurities. Page two typically shows the mass spectrometry data confirming molecular identity (expected mass vs measured mass in Daltons). The signatory at the bottom is the analytical chemist responsible for the report.

HPLC purity is the percentage of the target peptide in the sample. A 99.95% purity result means 99.95 of every 100 parts of material in the vial is the target compound, with the remaining 0.05% being synthesis byproducts, truncated sequences, or other impurities. Spartan rejects any batch below 98%.

HPLC measures purity, the percentage of target compound. Mass spectrometry confirms identity by matching molecular mass to the theoretical mass of the target peptide. A sample could be 99% pure but be the wrong molecule. Both methods together verify both purity and identity.

Every production lot is tested before it is approved for release. When a new lot enters inventory, a representative sample is sent to the lab for HPLC and MS analysis. The COA shown corresponds to the current lot. If you want to verify which lot you received, contact support with your order number.

The mass number is the molecular mass of the peptide measured in Daltons. Each COA shows two values: the expected mass (theoretical) and the found mass (measured by HPLC-MS). When these match within typical instrument tolerance, the compound’s identity is confirmed.

MZ Biolabs is an independent analytical laboratory based at 2102 N Country Club Rd, Tucson AZ 85716. Spartan Peptides has no ownership, financial interest, or operational relationship with MZ Biolabs beyond paying for testing services. Every COA is signed directly by the lab’s analytical chemist, Ken Pendarvis, ChE. The lab can be verified independently at mzbiolabs.com.

These Certificates are reproduced for verification purposes only. They are the property of Spartan Peptides and are presented as embedded page images rather than downloadable files. Reuse without permission is prohibited.

Most suppliers either skip third-party testing entirely or publish a single internal HPLC trace without identity confirmation. Spartan submits every lot to an independent commercial laboratory for HPLC plus mass spectrometry, and publishes the unaltered signed reports. Researchers can verify the lab directly and see the actual chromatogram and mass spectrum.