CJC-1295 DAC FAQ for Laboratory Researchers
This comprehensive CJC-1295 DAC FAQ provides principal investigators and laboratory personnel with verified scientific data regarding sequence chemistry, pharmacokinetics, storage protocols, and quality verification. As a modified growth hormone-releasing hormone analog, CJC-1295 DAC is strictly evaluated in preclinical and in vitro research environments.
Quick answer
This comprehensive CJC-1295 DAC FAQ provides principal investigators and laboratory personnel with verified scientific data regarding sequence chemistry, pharmacokinetics, storage protocols, and quality verification. As a modified growth hormone-releasing hormone analog, CJC-1295 DAC is strictly evaluated in preclinical and in vitro research environments.
Key takeaways
- [CJC-1295](/research-peptides/cjc-1295-no-dac) DAC is a synthetic 29-amino-acid peptide analog of human growth hormone-releasing hormone (GHRH, specifically the 1–29 amino acid sequence).
- In preclinical model systems, [CJC-1295](/research-peptides/cjc-1295-no-dac) DAC binds selectively to the GHRH receptor (GHRHR) located on anterior pituitary somatotrophs.
- When designing comparative study protocols, researchers frequently evaluate [CJC-1295](/research-peptides/cjc-1295-no-dac) DAC alongside short-acting analogs and growth hormone secretagogue receptor (GHSR) agonists.
- Maintaining high experimental reproducibility requires ultra-pure peptide preparations free of truncations, deletion sequences, or residual synthetic solvents.
Biochemical Structure and Structural Modifications of CJC-1295 DAC
CJC-1295 DAC is a synthetic 29-amino-acid peptide analog of human growth hormone-releasing hormone (GHRH, specifically the 1–29 amino acid sequence). The compound incorporates specific amino acid substitutions at positions 2, 8, 15, and 27 to enhance enzymatic resistance against dipeptidyl peptidase-IV (DPP-IV). The defining feature of CJC-1295 DAC is the addition of the Drug Affinity Complex (DAC) linker—specifically a maleimidopropionic acid group attached via a lysine linker at the C-terminus.
The primary design rationale behind the DAC moiety is its high affinity for free cysteine-34 residues on circulating serum albumin. Upon exposure to physiological media or animal serum, CJC-1295 DAC forms a stable, covalent bioconjugate with endogenous albumin. This albumin-binding mechanism drastically protects the peptide backbone from rapid renal clearance and enzymatic degradation, fundamentally altering its pharmacokinetic profile compared to standard unmodified GHRH formulations.
Preclinical Pharmacokinetics and Receptor Signaling
In preclinical model systems, CJC-1295 DAC binds selectively to the GHRH receptor (GHRHR) located on anterior pituitary somatotrophs. Activation of GHRHR triggers a G-protein-coupled receptor cascade that elevates intracellular cyclic adenosine monophosphate (cAMP) and protein kinase A (PKA) signaling. This cascade stimulates the transcription and release of endogenous growth hormone (GH).
Unlike short-acting GHRH derivatives, the persistent circulation of albumin-bound CJC-1295 DAC sustains elevated baseline GH levels and drives downstream secretion of Insulin-like Growth Factor 1 (IGF-1). In rodent and non-human primate models, this continuous stimulation facilitates long-term evaluation of cellular proliferation, protein synthesis, metabolic expenditure, and tissue repair research without requiring frequent repeated administrations.
Comparative Analysis: GHRH Analogs and Secretagogues
When designing comparative study protocols, researchers frequently evaluate CJC-1295 DAC alongside short-acting analogs and growth hormone secretagogue receptor (GHSR) agonists. Understanding the kinetic differences between these target molecules is vital for interpreting baseline growth hormone dynamics.
While CJC-1295 DAC maintains extended biological availability measured in days, compounds such as CJC-1295 No DAC display a rapid half-life measured in minutes, yielding acute GH spikes rather than elevated baseline levels. Similarly, traditional short-chain GHRH fragments like Sermorelin and targeted analogs like Tesamorelin require different dosing schedules in animal models to maintain receptor activation. To investigate synergistic somatotroph signaling, researchers often pair GHRH analogs with ghrelin receptor agonists such as Ipamorelin, which activate distinct intracellular pathways to amplify overall GH secretion.
Analytical Quality Assurance: HPLC and Mass Spectrometry
Maintaining high experimental reproducibility requires ultra-pure peptide preparations free of truncations, deletion sequences, or residual synthetic solvents. PX1 Research subjects every synthesized lot of CJC-1295 DAC to rigorous high-performance liquid chromatography (HPLC) and mass spectrometry (MS) characterization.
HPLC analysis confirms batch purity exceeding 99%, ensuring minimal chromatographic baseline noise and absence of early-eluting degradation peaks. Concurrent liquid chromatography-mass spectrometry (LC-MS) confirms the precise molecular weight (3647.95 Da) and mass distribution, verifying that the DAC linker remains intact and fully functional for covalent albumin binding. Researchers can access lot-specific documentation through our research library or direct product documentation.
Endotoxin Control and Bioburden Specifications
Bacterial endotoxins (lipopolysaccharides) introduce significant confounding variables in cell culture assays and animal studies by triggering inflammatory cytokine release, altered gene expression, and immune cell recruitment. Standard peptide synthesis can leave residual endotoxins if raw materials or purification processes are unmonitored.
PX1 Research enforces stringent endotoxin limits using quantitative Chromogenic Limulus Amebocyte Lysate (LAL) testing in accordance with USP <85> guidelines. Our CJC-1295 DAC preparations are verified to contain <0.01 EU/µg of peptide. This strict threshold prevents pyrogenic responses in animal models and eliminates endotoxin-induced cell toxicity in in vitro somatotroph cultures.
Laboratory Reconstitution Protocols and Solubility Standards
Proper reconstitution technique is critical to preserve the secondary structure and covalent reactivity of the DAC moiety. Lyophilized CJC-1295 DAC should be equilibrated to room temperature prior to opening the vial to prevent condensation uptake within the matrix.
For standard laboratory applications, reconstitute using sterile Bacteriostatic Water (0.9% benzyl alcohol) or sterile 0.9% sodium chloride solution. Slowly introduce the diluent down the glass inner wall of the vial, allowing the solvent to saturate the cake naturally. Gently swirl or invert the container until completely dissolved; high-shear agitation or vigorous vortexing must be strictly avoided, as mechanical shear stress can promote peptide aggregation and denature the delicate DAC structure.
Storage Conditions, Lyophilization, and Thermal Stability
Lyophilized CJC-1295 DAC exhibits superior long-term stability when stored at sub-zero temperatures. Unopened vials should be maintained at -20°C for routine short-term holding or -80°C for long-term storage exceeding 12 months, protected from direct light exposure.
Once reconstituted, peptide stability depends heavily on storage temperature, pH, and aliquot handling. Reconstituted solutions maintained at 2°C to 8°C remain stable for up to 28 days when prepared with bacteriostatic diluents. To prevent degradation from repeated freeze-thaw cycles, reconstitate the peptide, divide it into single-use micro-aliquots using low-binding polypropylene tubes, and freeze at -80°C until immediate assay execution.
Procurement and Sourcing Standards for Academic and Industrial Labs
Selecting a reliable research peptide supplier requires evaluating manufacturing infrastructure, analytical transparency, and domestic supply chain security. PX1 Research synthesizes compounds within GMP-compliant facilities located in the USA, adhering to ISO 9001 and ISO 17025 quality management frameworks.
Every batch is fully traceable to its synthesis run and accompanied by a comprehensive Certificate of Analysis (COA). For institutional orders, facility expansion projects, or high-throughput animal screening programs, researchers can leverage our wholesale account portal to obtain bulk quantities with dedicated batch reservation, standardized cold-chain packaging, and fast same-day shipping originating directly from our California and Arizona fulfillment centers.
Frequently Asked Questions
What is CJC-1295 DAC and how is it used in laboratory research?
CJC-1295 DAC is a synthetic, 29-amino-acid GHRH analog featuring a Drug Affinity Complex (DAC) linker. It is used exclusively in laboratory settings for studying growth hormone signaling, somatotroph receptor activation, downstream IGF-1 upregulation, and tissue repair mechanisms in preclinical models.
What does the DAC (Drug Affinity Complex) modification do?
The DAC modification consists of a maleimidopropionic acid derivative attached to a lysine residue. In biological media or serum, it forms a covalent bond with free cysteine-34 on circulating serum albumin, protecting the peptide from rapid enzymatic degradation and extending its circulating half-life in preclinical test subjects.
How does CJC-1295 DAC differ from CJC-1295 No DAC?
CJC-1295 DAC includes the albumin-binding linker, resulting in an extended half-life (several days in rodent and primate models) and sustained elevation of GH/IGF-1. CJC-1295 No DAC lacks this complex, producing a short biological half-life (approximately 30 minutes) and rapid, pulsatile GH release dynamics.
What primary biological pathways are investigated using CJC-1295 DAC?
Researchers investigate CJC-1295 DAC to analyze GHRH receptor signaling cascades, cAMP/PKA intracellular pathways, anterior pituitary gene transcription, downstream hepatic IGF-1 synthesis, cellular protein translation, and nitrogen retention in model organisms.
How should unopened, lyophilized CJC-1295 DAC be stored?
Lyophilized CJC-1295 DAC should be stored at -20°C for standard short-term storage or at -80°C for long-term storage up to 24 months. Vials must be kept dry and protected from light to maintain chemical stability.
What is the recommended reconstitution procedure for CJC-1295 DAC?
Reconstitute by adding sterile Bacteriostatic Water or 0.9% Sodium Chloride gently down the inside wall of the vial. Allow the diluent to absorb into the lyophilized cake, then gently swirl the vial until clear. Avoid vortexing or shaking to prevent structural denaturation.
How long does reconstituted CJC-1295 DAC remain stable?
When reconstituted with bacteriostatic water, CJC-1295 DAC solutions remain stable for up to 28 days when refrigerated at 2°C to 8°C. For extended use, aliquot the solution into single-use low-binding tubes and freeze at -80°C.
How does PX1 Research verify the purity of CJC-1295 DAC?
PX1 Research verifies every batch through HPLC and Mass Spectrometry (LC-MS) in ISO 17025 accredited testing facilities. We guarantee chemical purity of ≥99% and exact molecular mass validation per lot.
What are the endotoxin limits for PX1 Research CJC-1295 DAC?
Every lot undergoes Chromogenic LAL testing to ensure endotoxin levels are maintained below <0.01 EU/µg (USP <85> standard), ensuring non-pyrogenic properties and suitability for sensitive in vitro and animal models.
Can CJC-1295 DAC be co-administered with GHRPs in research studies?
In preclinical study designs, GHRH analogs like CJC-1295 DAC are frequently combined with GH secretagogues (such as Ipamorelin or GHRP-6) to investigate synergistic GH secretion resulting from dual receptor activation on pituitary somatotrophs.
How does CJC-1295 DAC compare to Tesamorelin or Sermorelin?
CJC-1295 DAC provides long-acting baseline GHRH activation due to covalent albumin binding. Sermorelin and Tesamorelin are shorter-acting analogs that require more frequent administration to simulate native physiological pulsatility in study models.
How can institutional labs procure bulk CJC-1295 DAC from PX1 Research?
Academic and commercial institutions can request bulk quantities, custom lot reservations, and volume discounts through the PX1 Research wholesale portal. All orders ship same-day from domestic US facilities in California and Arizona.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.