Research compound reference

CJC-1295 (DAC)

CJC-1295 (DAC) is a synthetic linear peptide of 30 amino acids with an amidated C-terminus, a D-alanine at position 2 and a modified lysine at position 30. The material is a white to off-white lyophilized powder of 99% or greater purity by HPLC, with a lot-specific Certificate of Analysis, for in vitro laboratory research. This page is a technical reference to the material's identity, chemistry, analytical testing and laboratory handling.

For research use only. Not for human or veterinary, diagnostic or therapeutic use.

The sequence, residue by residue

A single unbranched chain of 30 amino acids, read from the free amino end (N-terminus) to the amidated end (C-terminus).¹

1YTyr

2AD-Ala

3DAsp

4AAla

5IIle

6FPhe

7TThr

8QGln

9SSer

10YTyr

11RArg

12KLys

13VVal

14LLeu

15AAla

16QGln

17LLeu

18SSer

19AAla

20RArg

21KLys

22LLeu

23LLeu

24QGln

25DAsp

26IIle

27LLeu

28SSer

29RArg

30KLys(MPA)

H₂N (N-terminus)CONH₂ (C-terminus, amide)

H-Tyr-D-Ala-DAIFTQSYRKVLAQLSARKLLQDILSR-Lys(MPA)-NH₂

Acidic side chain (Asp) Basic side chain (Lys, Arg) D-amino acid Modified lysine (MPA, uncharged side chain) Other residues

Position 30 is lysine carrying a 3-maleimidopropanoyl (MPA) group on its side-chain amine.

What is CJC-1295 (DAC)?

CJC-1295 (DAC) is a synthetic linear peptide of 30 amino acids with an amidated C-terminus, a D-alanine at position 2 and a modified lysine at position 30. It is catalogued under CAS 446262-90-4 and PubChem CID 91971820, with the molecular formula C₁₆₅H₂₆₉N₄₇O₄₆ and a molecular weight of 3647.2 g/mol.¹

The material described on this page is a synthetic peptide intended as a laboratory reagent.

30residues

3647.2g/mol¹

≥99%purity by HPLC, per lot

Composition

The 30 residues are leucine (×5), alanine (×4), arginine (×3), glutamine (×3), lysine (×3), serine (×3), aspartic acid (×2), isoleucine (×2), tyrosine (×2), phenylalanine, threonine and valine. Counting a free amino end and an amidated carboxyl end, the peptide carries a calculated net charge of about plus four at pH 7. The modified lysine at position 30 carries no side-chain charge.

The sequence contains no cysteine, methionine or tryptophan, the residues most prone to air oxidation in peptides.²

The modified lysine

The side-chain amine of lysine 30 carries a 3-maleimidopropanoyl group. Relative to an unmodified lysine, the MPA group adds C₇H₅NO₃. Together with the added lysine at position 30, this accounts for the C₁₃H₁₇N₃O₄ difference from CJC-1295 (no DAC).¹

Handling

CJC-1295 (DAC) is a dry solid as received in the laboratory. General handling guidance for lyophilized peptides applies.²

Allow the sealed container to reach room temperature before opening, so moisture does not condense on the solid.²
Keep the solid dry and away from bright light. Moisture lowers long-term stability.²
Avoid repeated freezing and thawing.²

Storage and stability

State	Temperature	Notes
Dry, sealed	-20 °C, or preferably -80 °C²	Keep dry and away from bright light. Moisture lowers long-term stability.²
Freezing and thawing	Avoid repeated freezing and thawing	Applies to the dry solid.²

How each lot is tested

Each lot in the My Oasis Labs Peptides catalogue is tested by an independent third-party laboratory.³ The CJC-1295 (DAC) certificate page names the testing laboratories and lists each lot's purity, net content and test date. Three measurements are reported.

Identity

Mass spectrometry

Checks that the measured molecular mass matches CJC-1295 (DAC). The calculated monoisotopic mass is 3645.02 Da.¹

A matching mass is consistent with the expected composition. It does not confirm the order of residues.

Purity

High-performance liquid chromatography (HPLC)

Separates the material from synthesis-related impurities. Purity is reported as the main peak's share of the total detected signal.

Reported per lot. The Oasis Labs specification is 99% or greater.

Quantity

Net content

Measures the mass of material actually present in the sample tested.

Reported per lot on the Certificate of Analysis.

Technical notes

What does the Certificate of Analysis confirm?

Identity by mass spectrometry, purity by HPLC, and the net content of the sample. Mass spectrometry confirms molecular mass, not the order of residues.

Why do molecular weights for CJC-1295 (DAC) differ slightly between sources?

The figure of 3647.2 g/mol is for the form described in the cited PubChem record. Salt forms carry extra counter-ion mass and are often registered separately.

Why is the material freeze-dried?

Peptides are most stable as dry solids. Moisture reduces long-term stability, so the material is lyophilized and kept sealed until use in the laboratory.

CJC-1295 (DAC) lot certificates

Each listed CJC-1295 (DAC) lot has its own certificate covering identity, purity and net content.

View CJC-1295 (DAC) certificates Testing methodology

Catalogue entry: CJC-1295 (DAC)

References

National Center for Biotechnology Information. PubChem Compound Summary for CID 91971820 (CJC-1295 (DAC)). pubchem.ncbi.nlm.nih.gov/compound/91971820. Accessed 20 October 2026.
MilliporeSigma (Merck KGaA). Handling and storage guidelines for peptides and proteins (technical article). merckmillipore.com. Accessed 14 October 2026.
Oasis Labs. CJC-1295 (DAC) Certificate of Analysis page, lot data and testing laboratories (certificate page), and testing methodology, myoasislabs.com/coa-process/.

References document the chemical identity, analytical characterisation and handling of this material. Molecular composition and the calculated net charge are derived from the published sequence.