PT-141 10mg — Vial Spec, Reconstitution Math & COA

Overview of PT-141 10mg Lyophilized Vials

A 10mg vial of PT-141 (Bremelanotide) contains precisely 10 milligrams of high-purity, lyophilized synthetic peptide cake formulated under inert nitrogen atmosphere to preserve molecular integrity. This specific mass unit is engineered for academic, institutional, and private research facilities requiring a consolidated peptide source for repeated in vitro assays or structured multi-subject preclinical rodent models. Ordering a 10mg vial configuration optimizes storage footprint while offering consistent compound lot integrity across an extended experimental sequence.

PT-141 functions primarily as a non-selective melanocortin receptor agonist, exhibiting potent affinity for central melanocortin receptors MC3R and MC4R. When researchers evaluate the pt-141 10mg specifications, they are acquiring a research compound specifically synthesized for evaluating neurochemical signaling, central nervous system pathway activation, and physiological responses associated with melanocortin receptor activity.

For research environments managing high-throughput assays or multi-vial studies, sourcing 10mg units minimizes lot-to-lot variance compared to utilizing multiple lower-mass vials over a single research phase. If a specific single 10mg packaging option is temporarily out of stock, laboratories can review equivalent total mass offerings across our catalog of all-peptides or request tailored batch allocations through our wholesale institutional portal.

Molecular Structure and Melanocortin Receptor Signaling

PT-141 is a cyclic heptapeptide analog of alpha-melanocyte-stimulating hormone (α-MSH) with the chemical sequence Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH. The cyclic lactam bridge between the Asp and Lys residues imparts significant enzymatic stability compared to endogenous linear melanocortin peptides. This structural modification enhances resistance to central and peripheral peptidases, allowing researchers to measure extended receptor activation kinetics during baseline binding studies.

In preclinical model systems, PT-141 functions as a full agonist across multiple melanocortin receptor subtypes. Experimental data demonstrate robust binding affinity at the melanocortin-4 receptor (MC4R) and melanocortin-3 receptor (MC3R), with lower affinity at MC1R and MC5R. Unlike classical peripheral vasoactive compounds, PT-141 acts directly within the central nervous system, specifically modulating neuronal circuitry within the hypothalamus and limbic system.

Preclinical investigation into melanocortin receptor signaling linked to sexual-health pathways focuses on the hypothalamic paraventricular nucleus (PVN) and medial preoptic area (mPOA). In vitro ligand-binding assays and rodent behavioral assays indicate that activation of central MC4R pathways by PT-141 stimulates downstream dopamine release in the nucleus accumbens, providing a defined mechanistic model for evaluating central arousal and autonomic signaling pathways.

Reconstitution Math: Diluent Volume & Concentration Calculations

Accurate reconstitution of a 10mg PT-141 vial is crucial for maintaining standardized dosing concentrations across micro-volume laboratory equipment. Reconstitution involves introducing a sterile, compatible diluent—typically Bacteriostatic Water (0.9% benzyl alcohol) or sterile normal saline—into the vacuum-sealed vial.

The mathematical formula to determine working concentration is: Concentration (mg/mL) = Total Mass (10 mg) / Added Diluent Volume (mL). To convert this into micrograms per microliter (µg/µL), multiply the result by 1 (since 1 mg/mL equals 1 µg/µL). Below are standard reconstitution volumetric calculations for a 10mg vial:

1.0 mL Diluent Volume: 10 mg / 1.0 mL = 10.0 mg/mL (10.0 µg/µL). This creates a concentrated stock solution ideal for minimal-volume micro-pipetting or serial dilution stock plates.

2.0 mL Diluent Volume: 10 mg / 2.0 mL = 5.0 mg/mL (5.0 µg/µL). This provides a versatile mid-range concentration balancing volumetric accuracy with manageable aliquot sizes.

3.0 mL Diluent Volume: 10 mg / 3.0 mL = 3.33 mg/mL (3.33 µg/µL). This volumetric ratio is often selected when precise micro-dosing requires larger syringe volumes to reduce volumetric pipetting margins of error.

For complex dilution series or customized liquid handling parameters, researchers should utilize our interactive reconstitution calculator to verify micro-gram per microliter values prior to working solution preparation.

Aliquot Planning and Assay Working Stock Protocols

To prevent degradation caused by repeated freeze-thaw cycles, reconstituted PT-141 solutions must be carefully aliquoted into sterile, polypropylene micro-centrifuge tubes. Freeze-thaw cycles subject the peptide backbone to thermal and shear stress, leading to potential peptide aggregation or hydrolysis of the cyclic structure.

When preparing working stock aliquots from a 10mg vial reconstituted in 2.0 mL of diluent (5.0 mg/mL concentration), research personnel should partition the liquid into single-use volumes matching daily experimental requirements. For instance, distributing the 2.0 mL stock into twenty 100 µL micro-tubes yields 500 µg of PT-141 per aliquot tube.

Each aliquot container should be clearly labeled with the compound name, lot number, final working concentration, reconstitution diluent type, and date of preparation. Store working aliquots at -20°C or -80°C until immediately prior to assay execution. Once an aliquot is thawed for testing, any remaining unused solution should be discarded or kept at 2–8°C for short-term use within 24–48 hours depending on stability controls.

Analytical Verification: HPLC, Mass Spectrometry, and COA Issuance

Every batch of PT-141 manufactured for PX1 Research undergoes rigorous analytical testing in ISO 17025 accredited testing facilities to guarantee identity, purity, and chemical consistency. We do not rely on generalized batch estimates; every filled vial size, including 10mg configurations, is tied directly to a lot-specific Certificate of Analysis.

High-Performance Liquid Chromatography (HPLC) is conducted to evaluate chromatographic purity. PX1 Research enforces a strict purity threshold of ≥98.0% for all research peptides. Mass Spectrometry (MS) analysis is performed simultaneously to confirm the exact target molecular weight (1024.2 g/mol for Bremelanotide free base), ensuring the absence of truncated sequences or incomplete cyclic side reactions.

Additionally, endotoxin testing is conducted via Limulus Amebocyte Lysate (LAL) assay to ensure levels remain strictly below laboratory research limits (<0.05 EU/mg). Researchers can review and download certified lot reports directly through our centralized coa hub to support institutional audit and compliance protocols.

Comparative Analysis: Melanocortin Class Agonists

Understanding how PT-141 differs from structural and functional analogs within the melanocortin peptide class is vital for proper experimental design. Below is a comparison of primary research melanocortin receptor ligands used in preclinical literature:

pt-141-10mg: A cyclic heptapeptide selective for central MC3R and MC4R activation. Exhibiting minimal activity at peripheral vascular receptors compared to non-selective linear melanocortins, PT-141 is primarily investigated for central neurochemical pathways and sexual function signaling.

melanotan-ii: A non-selective cyclic melanocortin agonist with high affinity across MC1R, MC3R, MC4R, and MC5R. While sharing structural homology with PT-141, Melanotan II exhibits pronounced activity at MC1R, driving melanogenesis assays alongside central MC4R activation.

alpha-msh: The naturally occurring 13-amino-acid tridecapeptide endogenous ligand. Alpha-MSH activates all non-MC2R melanocortin receptors non-selectively but possesses a rapid in vivo half-life due to rapid cleavage by serum peptidases.

Selecting between these compounds depends on whether the investigative target is melanocyte pathway stimulation (Melanotan II), baseline endogenous receptor kinetics (Alpha-MSH), or targeted central nervous system pathway response without cutaneous melanogenesis (PT-141).

Storage, Stability, and Lyophilization Standards

Lyophilized PT-141 10mg vials are shipped as a stable, moisture-controlled vacuum cake. Unreconstituted vials should be stored upon receipt in a dark freezer environment maintained at -20°C or -80°C for long-term storage stability (up to 24 months). Store away from direct light exposure, as UV radiation can induce tryptophan residue oxidation within the peptide chain.

When stored short-term (under 30 days) prior to reconstitution, unreconstituted lyophilized vials remain stable at desiccated room temperature (15–25°C) or standard refrigeration (2–8°C), making shipping logistics highly robust.

Post-reconstitution, liquid PT-141 solutions are sensitive to enzymatic degradation and thermal stress. Reconstituted aqueous solutions stored at 2–8°C retain target potency for up to 30 days when formulated with Bacteriostatic Water. Frozen reconstituted stock (-20°C or lower) remains stable for up to 6 months provided sub-aliquoting protocols are observed to prevent freeze-thaw degradation.

Choosing Between Vial Sizes: 10mg vs. Alternative Formats

Selecting the correct vial size depends directly on laboratory throughput, assay scale, and project timelines. While 10mg vials represent a cost-efficient high-mass configuration for extensive research projects, smaller mass options may be preferred for limited exploratory pilots.

Choose a 10mg Vial Format When: Managing multi-week rodent cohort studies, running high-density microplate receptor binding screens, or preparing standardized stock solutions intended for multi-assay comparison series. High-mass vials reduce packaging waste and lower per-milligram raw material expense.

Choose Smaller Mass Formats (e.g., 2mg or 5mg) When: Conducting initial assay validation, performing short-duration pilot studies, or when experimental protocols dictate fresh reconstitution for every single test replicate without long-term liquid storage.

If your experimental setup requires custom packaging formats, high-volume multi-vial arrays, or specific batch lot reservation, review our wholesale ordering programs or consult our technical support team for custom lab fills.

Laboratory Handling and Safe Preparation Guidance

All handling of PT-141 10mg vials must be conducted within a certified Class II Laminar Flow Clean Bench or Biosafety Cabinet (BSC) to maintain sterility and prevent environmental contamination. Technicians must wear appropriate Personal Protective Equipment (PPE), including nitrile gloves, laboratory coats, and eye protection.

Prior to reconstituting, equalize the vial temperature to room temperature to prevent condensation formation inside the glass container upon stopper puncture. Wipe the rubber septum with a 70% isopropyl alcohol swab and allow it to air-dry completely.

Direct the diluent stream against the glass side wall of the vial rather than forcing liquid directly onto the lyophilized cake. Gently swirl the vial in a circular motion until the cake dissolves completely into a clear, colorless solution. Never shake or vortex the vial, as mechanical agitation can induce protein denaturation and visible particulate formation. Detailed experimental methodologies can be explored within our research literature index.